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| <article class="doc"> |
| <h1 class="page">Monitoring</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics in Cassandra are managed using the |
| <a href="http://metrics.dropwizard.io">Dropwizard Metrics</a> library. These metrics |
| can be queried via JMX or pushed to external monitoring systems using a |
| number of |
| <a href="http://metrics.dropwizard.io/3.1.0/getting-started/#other-reporting">built |
| in</a> and <a href="http://metrics.dropwizard.io/3.1.0/manual/third-party/">third |
| party</a> reporter plugins.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Metrics are collected for a single node. It’s up to the operator to use |
| an external monitoring system to aggregate them.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="metric-types"><a class="anchor" href="#metric-types"></a><a class="link" href="#metric-types">Metric Types</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>All metrics reported by cassandra fit into one of the following types.</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><code>Gauge</code></dt> |
| <dd> |
| <p>An instantaneous measurement of a value.</p> |
| </dd> |
| <dt class="hdlist1"><code>Counter</code></dt> |
| <dd> |
| <p>A gauge for an <code>AtomicLong</code> instance. Typically this is consumed by |
| monitoring the change since the last call to see if there is a large |
| increase compared to the norm.</p> |
| </dd> |
| <dt class="hdlist1"><code>Histogram</code></dt> |
| <dd> |
| <p>Measures the statistical distribution of values in a stream of data. |
| + |
| In addition to minimum, maximum, mean, etc., it also measures median, |
| 75th, 90th, 95th, 98th, 99th, and 99.9th percentiles.</p> |
| </dd> |
| <dt class="hdlist1"><code>Timer</code></dt> |
| <dd> |
| <p>Measures both the rate that a particular piece of code is called and |
| the histogram of its duration.</p> |
| </dd> |
| <dt class="hdlist1"><code>Latency</code></dt> |
| <dd> |
| <p>Special type that tracks latency (in microseconds) with a <code>Timer</code> plus |
| a <code>Counter</code> that tracks the total latency accrued since starting. The |
| former is useful if you track the change in total latency since the |
| last check. Each metric name of this type will have 'Latency' and |
| 'TotalLatency' appended to it.</p> |
| </dd> |
| <dt class="hdlist1"><code>Meter</code></dt> |
| <dd> |
| <p>A meter metric which measures mean throughput and one-, five-, and |
| fifteen-minute exponentially-weighted moving average throughputs.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="table-metrics"><a class="anchor" href="#table-metrics"></a><a class="link" href="#table-metrics">Table Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Each table in Cassandra has metrics responsible for tracking its state |
| and performance.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The metric names are all appended with the specific <code>Keyspace</code> and |
| <code>Table</code> name.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Table.<MetricName>.<Keyspace>.<Table></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Table keyspace=<Keyspace> scope=<Table> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| <div class="title">Note</div> |
| <div class="paragraph"> |
| <p>There is a special table called ‘all’ without a keyspace. This |
| represents the aggregation of metrics across <strong>all</strong> tables and keyspaces |
| on the node. |
| ====[cols=",,",options="header",]</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Name</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Type</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Description</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableOnHeapSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of data stored in the |
| memtable that resides <strong>on</strong>-heap, including column related overhead and |
| partitions overwritten.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableOffHeapSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of data stored in the |
| memtable that resides <strong>off</strong>-heap, including column related overhead and |
| partitions overwritten.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableLiveDataSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of live data stored in |
| the memtable, excluding any data structure overhead.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">AllMemtablesOnHeapSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of data stored in the |
| memtables (2i and pending flush memtables included) that resides |
| <strong>on</strong>-heap.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">AllMemtablesOffHeapSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of data stored in |
| the memtables (2i and pending flush memtables included) that resides |
| <strong>off</strong>-heap.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">AllMemtablesLiveDataSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total amount of live data stored |
| in the memtables (2i and pending flush memtables included) that resides |
| off-heap, excluding any data structure overhead.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableColumnsCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of columns present in |
| the memtable.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableSwitchCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of times flush has resulted in the |
| memtable being switched out.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompressionRatio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Current compression ratio for all |
| SSTables.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">EstimatedPartitionSizeHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<long[]></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of estimated |
| partition size (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">EstimatedPartitionCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Approximate number of keys in |
| table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">EstimatedColumnCountHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<long[]></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of estimated |
| number of columns.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SSTablesPerReadHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of the number of sstable |
| data files accessed per single partition read. SSTables skipped due to |
| Bloom Filters, min-max key or partition index lookup are not taken into |
| acoount.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ReadLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Local read latency for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RangeLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Local range scan latency for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">WriteLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Local write latency for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CoordinatorReadLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Coordinator read latency for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CoordinatorWriteLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Coordinator write latency for this |
| table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CoordinatorScanLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Coordinator range scan latency for this |
| table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingFlushes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated number of flush tasks pending for |
| this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesFlushed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of bytes flushed since server |
| [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompactionBytesWritten</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of bytes written by |
| compaction since server [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingCompactions</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimate of number of pending |
| compactions for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LiveSSTableCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of SSTables on disk for this |
| table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LiveDiskSpaceUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Disk space used by SSTables belonging to |
| this table (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalDiskSpaceUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total disk space used by SSTables |
| belonging to this table, including obsolete ones waiting to be GC’d.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MinPartitionSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of the smallest compacted partition |
| (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MaxPartitionSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of the largest compacted partition |
| (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MeanPartitionSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of the average compacted partition |
| (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BloomFilterFalsePositives</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of false positives on |
| table’s bloom filter.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BloomFilterFalseRatio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">False positive ratio of table’s |
| bloom filter.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BloomFilterDiskSpaceUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Disk space used by bloom filter |
| (in bytes).</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BloomFilterOffHeapMemoryUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Off-heap memory used by |
| bloom filter.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IndexSummaryOffHeapMemoryUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Off-heap memory used by |
| index summary.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompressionMetadataOffHeapMemoryUsed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Off-heap memory used |
| by compression meta data.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KeyCacheHitRate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Key cache hit rate for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TombstoneScannedHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of tombstones scanned |
| in queries on this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">LiveScannedHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of live cells scanned in |
| queries on this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ColUpdateTimeDeltaHistogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of column update time |
| delta on this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ViewLockAcquireTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time taken acquiring a partition lock for |
| materialized view updates on this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ViewReadTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time taken during the local read of a materialized |
| view update.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TrueSnapshotsSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Disk space used by snapshots of this |
| table including all SSTable components.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RowCacheHitOutOfRange</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of table row cache hits that do |
| not satisfy the query filter, thus went to disk.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RowCacheHit</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of table row cache hits.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RowCacheMiss</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of table row cache misses.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CasPrepare</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency of paxos prepare round.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CasPropose</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency of paxos propose round.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CasCommit</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency of paxos commit round.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PercentRepaired</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Percent of table data that is repaired |
| on disk.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesRepaired</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of table data repaired on disk</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesUnrepaired</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of table data unrepaired on disk</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesPendingRepair</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size of table data isolated for an |
| ongoing incremental repair</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SpeculativeRetries</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of times speculative retries were |
| sent for this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SpeculativeFailedRetries</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of speculative retries that |
| failed to prevent a timeout</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SpeculativeInsufficientReplicas</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of speculative retries |
| that couldn’t be attempted due to lack of replicas</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SpeculativeSampleLatencyNanos</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of nanoseconds to |
| wait before speculation is attempted. Value may be statically configured |
| or updated periodically based on coordinator latency.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">WaitingOnFreeMemtableSpace</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of time spent waiting |
| for free memtable space, either on- or off-heap.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">DroppedMutations</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of dropped mutations on this table.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">AnticompactionTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time spent anticompacting before a |
| consistent repair.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ValidationTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time spent doing validation compaction during |
| repair.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SyncTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time spent doing streaming during repair.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesValidated</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram over the amount of bytes read |
| during validation.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PartitionsValidated</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram over the number of partitions |
| read during validation.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesAnticompacted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">How many bytes we anticompacted.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesMutatedAnticompaction</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">How many bytes we avoided |
| anticompacting because the sstable was fully contained in the repaired |
| range.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MutatedAnticompactionGauge</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio of bytes mutated vs |
| total bytes repaired.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>== Keyspace Metrics</p> |
| </div> |
| <div class="paragraph"> |
| <p>Each keyspace in Cassandra has metrics responsible for tracking its |
| state and performance.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Most of these metrics are the same as the <code>Table Metrics</code> above, only |
| they are aggregated at the Keyspace level. The keyspace specific metrics |
| are specified in the table below.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.keyspace.<MetricName>.<Keyspace></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Keyspace scope=<Keyspace> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">WriteFailedIdeaCL</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of writes that failed to achieve the |
| configured ideal consistency level or 0 if none is configured</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IdealCLWriteLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Coordinator latency of writes at the |
| configured ideal consistency level. No values are recorded if ideal |
| consistency level is not configured</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RepairTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total time spent as repair coordinator.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RepairPrepareTime</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total time spent preparing for repair.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>== ThreadPool Metrics</p> |
| </div> |
| <div class="paragraph"> |
| <p>Cassandra splits work of a particular type into its own thread pool. |
| This provides back-pressure and asynchrony for requests on a node. It’s |
| important to monitor the state of these thread pools since they can tell |
| you how saturated a node is.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The metric names are all appended with the specific <code>ThreadPool</code> name. |
| The thread pools are also categorized under a specific type.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.ThreadPools.<MetricName>.<Path>.<ThreadPoolName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=ThreadPools path=<Path> scope=<ThreadPoolName> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ActiveTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of tasks being actively worked on |
| by this pool.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of queued tasks queued up on this |
| pool.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompletedTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of tasks completed.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalBlockedTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of tasks that were blocked due to |
| queue saturation.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CurrentlyBlockedTask</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of tasks that are currently |
| blocked due to queue saturation but on retry will become unblocked.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MaxPoolSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The maximum number of threads in this |
| pool.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MaxTasksQueued</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The maximum number of tasks queued |
| before a task get blocked.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>The following thread pools can be monitored.</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Native-Transport-Requests</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">transport</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Handles client CQL requests</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CounterMutationStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for counter writes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ViewMutationStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for materialized view writes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MutationStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for all other writes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ReadRepairStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ReadRepair happens on this thread pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ReadStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Local reads run on this thread pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RequestResponseStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">request</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Coordinator requests to the cluster run |
| on this thread pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">AntiEntropyStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Builds merkle tree for repairs</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CacheCleanupExecutor</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cache maintenance performed on this |
| thread pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompactionExecutor</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Compactions are run on these threads</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">GossipStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Handles gossip requests</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HintsDispatcher</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Performs hinted handoff</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">InternalResponseStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for intra-cluster |
| callbacks</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableFlushWriter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Writes memtables to disk</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtablePostFlush</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cleans up commit log after memtable is |
| written to disk</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MemtableReclaimMemory</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Memtable recycling</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MigrationStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Runs schema migrations</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MiscStage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Misceleneous tasks run here</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingRangeCalculator</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Calculates token range</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PerDiskMemtableFlushWriter_0</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for writing a spec |
| (there is one of these per disk 0-N)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Sampler</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Responsible for re-sampling the index summaries of |
| SStables</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">SecondaryIndexManagement</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Performs updates to secondary |
| indexes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ValidationExecutor</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Performs validation compaction or |
| scrubbing</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ViewBuildExecutor</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">internal</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Performs materialized views initial build</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>== Client Request Metrics</p> |
| </div> |
| <div class="paragraph"> |
| <p>Client requests have their own set of metrics that encapsulate the work |
| happening at coordinator level.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Different types of client requests are broken down by <code>RequestType</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.ClientRequest.<MetricName>.<RequestType></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=ClientRequest scope=<RequestType> name=<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>CASRead</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to transactional read requests.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",options="header",] |
| |=== |
| |Name |Type |Description |
| |Timeouts |Counter |Number of timeouts encountered.</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Failures |Counter |Number of transaction failures encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>| |Latency |Transaction read latency.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Unavailables |Counter |Number of unavailable exceptions encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|UnfinishedCommit |Counter |Number of transactions that were committed |
| on read.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ConditionNotMet |Counter |Number of transaction preconditions did not |
| match current values.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ContentionHistogram |Histogram |How many contended reads were |
| encountered |
| |===</pre> |
| </div> |
| </div> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>CASWrite</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to transactional write requests.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",options="header",] |
| |=== |
| |Name |Type |Description |
| |Timeouts |Counter |Number of timeouts encountered.</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Failures |Counter |Number of transaction failures encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>| |Latency |Transaction write latency.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|UnfinishedCommit |Counter |Number of transactions that were committed |
| on write.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ConditionNotMet |Counter |Number of transaction preconditions did not |
| match current values.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ContentionHistogram |Histogram |How many contended writes were |
| encountered</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|MutationSizeHistogram |Histogram |Total size in bytes of the requests |
| mutations. |
| |===</pre> |
| </div> |
| </div> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>Read</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to standard read requests.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",options="header",] |
| |=== |
| |Name |Type |Description |
| |Timeouts |Counter |Number of timeouts encountered. |
| |Failures |Counter |Number of read failures encountered. |
| | |Latency |Read latency. |
| |Unavailables |Counter |Number of unavailable exceptions encountered. |
| |===</p> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>RangeSlice</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to token range read requests.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",options="header",] |
| |=== |
| |Name |Type |Description |
| |Timeouts |Counter |Number of timeouts encountered. |
| |Failures |Counter |Number of range query failures encountered. |
| | |Latency |Range query latency. |
| |Unavailables |Counter |Number of unavailable exceptions encountered. |
| |===</p> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>Write</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to regular write requests.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",options="header",] |
| |=== |
| |Name |Type |Description |
| |Timeouts |Counter |Number of timeouts encountered.</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Failures |Counter |Number of write failures encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>| |Latency |Write latency.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Unavailables |Counter |Number of unavailable exceptions encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|MutationSizeHistogram |Histogram |Total size in bytes of the requests |
| mutations. |
| |===</pre> |
| </div> |
| </div> |
| </dd> |
| <dt class="hdlist1">RequestType</dt> |
| <dd> |
| <p>ViewWrite</p> |
| </dd> |
| <dt class="hdlist1">Description</dt> |
| <dd> |
| <p>Metrics related to materialized view write wrtes.</p> |
| </dd> |
| <dt class="hdlist1">Metrics</dt> |
| <dd> |
| <p>[cols=",,",] |
| |=== |
| |Timeouts |Counter |Number of timeouts encountered.</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Failures |Counter |Number of transaction failures encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|Unavailables |Counter |Number of unavailable exceptions encountered.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ViewReplicasAttempted |Counter |Total number of attempted view |
| replica writes.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ViewReplicasSuccess |Counter |Total number of succeded view replica |
| writes.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ViewPendingMutations |Gauge<Long> |ViewReplicasAttempted - |
| ViewReplicasSuccess.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>|ViewWriteLatency |Timer |Time between when mutation is applied to |
| base table and when CL.ONE is achieved on view. |
| |===</pre> |
| </div> |
| </div> |
| </dd> |
| </dl> |
| </div> |
| <div class="paragraph"> |
| <p>== Cache Metrics</p> |
| </div> |
| <div class="paragraph"> |
| <p>Cassandra caches have metrics to track the effectivness of the caches. |
| Though the <code>Table Metrics</code> might be more useful.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Cache.<MetricName>.<CacheName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Cache scope=<CacheName> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cache capacity in bytes.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Entries</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of cache entries.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">FifteenMinuteCacheHitRate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">15m cache hit rate.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">FiveMinuteCacheHitRate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">5m cache hit rate.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">OneMinuteCacheHitRate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1m cache hit rate.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HitRate</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">All time cache hit rate.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hits</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Meter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of cache hits.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Misses</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Meter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of cache misses.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MissLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Latency of misses.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Requests</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of cache requests.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total size of occupied cache, in bytes.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>The following caches are covered:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CounterCache</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Keeps hot counters in memory for performance.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">ChunkCache</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">In process uncompressed page cache.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">KeyCache</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cache for partition to sstable offsets.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RowCache</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Cache for rows kept in memory.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Misses and MissLatency are only defined for the ChunkCache |
| ====== CQL Metrics</p> |
| </div> |
| <div class="paragraph"> |
| <p>Metrics specific to CQL prepared statement caching.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.CQL.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=CQL name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PreparedStatementsCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of cached prepared |
| statements.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PreparedStatementsEvicted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of prepared statements |
| evicted from the prepared statement cache</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PreparedStatementsExecuted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of prepared statements |
| executed.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RegularStatementsExecuted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of <strong>non</strong> prepared statements |
| executed.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PreparedStatementsRatio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Double></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Percentage of statements that |
| are prepared vs unprepared.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="dropped-metrics"><a class="anchor" href="#dropped-metrics"></a><a class="link" href="#dropped-metrics">DroppedMessage Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to tracking dropped messages for different types of |
| requests. Dropped writes are stored and retried by <code>Hinted Handoff</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.DroppedMessage.<MetricName>.<Type></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=DroppedMessage scope=<Type> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CrossNodeDroppedLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The dropped latency across nodes.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">InternalDroppedLatency</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The dropped latency within node.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Dropped</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Meter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of dropped messages.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>The different types of messages tracked are:</p> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BATCH_STORE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Batchlog write</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BATCH_REMOVE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Batchlog cleanup (after succesfully applied)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">COUNTER_MUTATION</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter writes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HINT</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hint replay</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">MUTATION</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Regular writes</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">READ</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Regular reads</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">READ_REPAIR</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Read repair</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PAGED_SLICE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Paged read</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RANGE_SLICE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Token range read</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">REQUEST_RESPONSE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">RPC Callbacks</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">_TRACE</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Tracing writes</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="streaming-metrics"><a class="anchor" href="#streaming-metrics"></a><a class="link" href="#streaming-metrics">Streaming Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics reported during <code>Streaming</code> operations, such as repair, |
| bootstrap, rebuild.</p> |
| </div> |
| <div class="paragraph"> |
| <p>These metrics are specific to a peer endpoint, with the source node |
| being the node you are pulling the metrics from.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Streaming.<MetricName>.<PeerIP></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Streaming scope=<PeerIP> name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IncomingBytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of bytes streamed to this node from the |
| peer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">OutgoingBytes</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of bytes streamed to the peer endpoint |
| from this node.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="compaction-metrics"><a class="anchor" href="#compaction-metrics"></a><a class="link" href="#compaction-metrics">Compaction Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to <code>Compaction</code> work.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Compaction.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Compaction name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">BytesCompacted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of bytes compacted since server |
| [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated number of compactions remaining |
| to perform.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompletedTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of completed compactions since |
| server [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalCompactionsCompleted</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Meter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Throughput of completed compactions |
| since server [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingTasksByTableName</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Map<String, Map<String, Integer>>></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated number of compactions remaining to perform, grouped by |
| keyspace and then table name. This info is also kept in <code>Table Metrics</code>.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="commitlog-metrics"><a class="anchor" href="#commitlog-metrics"></a><a class="link" href="#commitlog-metrics">CommitLog Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to the <code>CommitLog</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.CommitLog.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=CommitLog name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">CompletedTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of commit log messages |
| written since [re]start.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PendingTasks</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of commit log messages written but |
| yet to be fsync’d.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalCommitLogSize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Current size, in bytes, used by all |
| the commit log segments.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">WaitingOnSegmentAllocation</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time spent waiting for a |
| CommitLogSegment to be allocated - under normal conditions this should |
| be zero.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">WaitingOnCommit</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Timer</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The time spent waiting on CL fsync; for |
| Periodic this is only occurs when the sync is lagging its sync interval.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="storage-metrics"><a class="anchor" href="#storage-metrics"></a><a class="link" href="#storage-metrics">Storage Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to the storage engine.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Storage.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Storage name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Exceptions</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of internal exceptions caught. Under normal |
| exceptions this should be zero.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Load</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size, in bytes, of the on disk data size this node |
| manages.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalHints</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of hint messages written to this node since |
| [re]start. Includes one entry for each host to be hinted per hint.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">TotalHintsInProgress</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Counter</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of hints attemping to be sent |
| currently.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="handoff-metrics"><a class="anchor" href="#handoff-metrics"></a><a class="link" href="#handoff-metrics">HintedHandoff Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to Hinted Handoff. There are also some metrics related |
| to hints tracked in <code>Storage Metrics</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>These metrics include the peer endpoint <strong>in the metric name</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.HintedHandOffManager.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=HintedHandOffManager name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hints_created-<PeerIP></p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Counter</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Number of hints on disk for this peer.</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hints_not_stored-<PeerIP></p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Counter</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Number of hints not stored for this peer, due to being down past the |
| configured hint window.</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="hintsservice-metrics"><a class="anchor" href="#hintsservice-metrics"></a><a class="link" href="#hintsservice-metrics">HintsService Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to the Hints delivery service. There are also some |
| metrics related to hints tracked in <code>Storage Metrics</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>These metrics include the peer endpoint <strong>in the metric name</strong></p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.HintsService.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=HintsService name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HintsSucceeded</p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Meter</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>A meter of the hints successfully delivered</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HintsFailed</p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Meter</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>A meter of the hints that failed deliver</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">HintsTimedOut</p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>Meter</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>A meter of the hints that timed out</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hint_delays</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of hint delivery delays (in |
| milliseconds)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Hint_delays-<PeerIP></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of hint delivery delays (in |
| milliseconds) per peer</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="sstable-index-metrics"><a class="anchor" href="#sstable-index-metrics"></a><a class="link" href="#sstable-index-metrics">SSTable Index Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to the SSTable index metadata.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Index.<MetricName>.RowIndexEntry</code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Index scope=RowIndexEntry name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IndexedEntrySize</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of the on-heap size, in bytes, |
| of the index across all SSTables.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IndexInfoCount</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of the number of on-heap index |
| entries managed across all SSTables.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">IndexInfoGets</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram of the number index seeks performed |
| per SSTable.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="bufferpool-metrics"><a class="anchor" href="#bufferpool-metrics"></a><a class="link" href="#bufferpool-metrics">BufferPool Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specific to the internal recycled buffer pool Cassandra manages. |
| This pool is meant to keep allocations and GC lower by recycling on and |
| off heap buffers.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.BufferPool.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=BufferPool name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Size, in bytes, of the managed buffer pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Misses</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Meter</p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="quoteblock"> |
| <blockquote> |
| <div class="paragraph"> |
| <p>The rate of misses in the pool. The higher this is the more allocations |
| incurred.</p> |
| </div> |
| </blockquote> |
| </div></div></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="client-metrics"><a class="anchor" href="#client-metrics"></a><a class="link" href="#client-metrics">Client Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specifc to client managment.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Client.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Client name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectedNativeClients</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Integer></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of clients connected to |
| this nodes native protocol server</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connections</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<List<Map<String, String>></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">List of all connections |
| and their state information</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">connectedNativeClientsByUser</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Map<String, Int></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Number of |
| connnective native clients by username</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="batch-metrics"><a class="anchor" href="#batch-metrics"></a><a class="link" href="#batch-metrics">Batch Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Metrics specifc to batch statements.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Reported name format:</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics.Batch.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>org.apache.cassandra.metrics:type=Batch name=<MetricName></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PartitionsPerCounterBatch</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Distribution of the number of |
| partitions processed per counter batch</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PartitionsPerLoggedBatch</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Distribution of the number of |
| partitions processed per logged batch</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">PartitionsPerUnloggedBatch</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Histogram</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Distribution of the number of |
| partitions processed per unlogged batch</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="jvm-metrics"><a class="anchor" href="#jvm-metrics"></a><a class="link" href="#jvm-metrics">JVM Metrics</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>JVM metrics such as memory and garbage collection statistics can either |
| be accessed by connecting to the JVM using JMX or can be exported using |
| <a href="#metric-reporters">Metric Reporters</a>.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="bufferpool"><a class="anchor" href="#bufferpool"></a><a class="link" href="#bufferpool">BufferPool</a></h3> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>jvm.buffers.<direct|mapped>.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>java.nio:type=BufferPool name=<direct|mapped></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Capacity</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated total capacity of the buffers in this |
| pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Count</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated number of buffers in the pool</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Used</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Estimated memory that the Java virtual machine is |
| using for this buffer pool</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="filedescriptorratio"><a class="anchor" href="#filedescriptorratio"></a><a class="link" href="#filedescriptorratio">FileDescriptorRatio</a></h3> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>jvm.fd.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>java.lang:type=OperatingSystem name=<OpenFileDescriptorCount|MaxFileDescriptorCount></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Usage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio of used to total file descriptors</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="garbagecollector"><a class="anchor" href="#garbagecollector"></a><a class="link" href="#garbagecollector">GarbageCollector</a></h3> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>jvm.gc.<gc_type>.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>java.lang:type=GarbageCollector name=<gc_type></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top">Name</th> |
| <th class="tableblock halign-left valign-top">Type</th> |
| <th class="tableblock halign-left valign-top">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Count</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Total number of collections that have occurred</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Time</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Approximate accumulated collection elapsed time in |
| milliseconds</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="memory"><a class="anchor" href="#memory"></a><a class="link" href="#memory">Memory</a></h3> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>jvm.memory.<heap/non-heap/total>.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>java.lang:type=Memory</code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Committed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of memory in bytes that is committed for |
| the JVM to use</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Init</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of memory in bytes that the JVM initially |
| requests from the OS</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Max</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Maximum amount of memory in bytes that can be used |
| for memory management</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Usage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio of used to maximum memory</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Used</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of used memory in bytes</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="sect2"> |
| <h3 id="memorypool"><a class="anchor" href="#memorypool"></a><a class="link" href="#memorypool">MemoryPool</a></h3> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><strong>Metric Name</strong></dt> |
| <dd> |
| <p><code>jvm.memory.pools.<memory_pool>.<MetricName></code></p> |
| </dd> |
| <dt class="hdlist1"><strong>JMX MBean</strong></dt> |
| <dd> |
| <p><code>java.lang:type=MemoryPool name=<memory_pool></code></p> |
| </dd> |
| </dl> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <colgroup> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3333%;"> |
| <col style="width: 33.3334%;"> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Committed</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of memory in bytes that is committed for |
| the JVM to use</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Init</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of memory in bytes that the JVM initially |
| requests from the OS</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Max</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Maximum amount of memory in bytes that can be used |
| for memory management</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Usage</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Ratio of used to maximum memory</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Used</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Gauge<Long></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">Amount of used memory in bytes</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="jmx"><a class="anchor" href="#jmx"></a><a class="link" href="#jmx">JMX</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Any JMX based client can access metrics from cassandra.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If you wish to access JMX metrics over http it’s possible to download |
| <a href="http://mx4j.sourceforge.net/">Mx4jTool</a> and place <code>mx4j-tools.jar</code> into |
| the classpath. On startup you will see in the log:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-none hljs" data-lang="none">HttpAdaptor version 3.0.2 started on port 8081</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>To choose a different port (8081 is the default) or a different listen |
| address (0.0.0.0 is not the default) edit <code>conf/cassandra-env.sh</code> and |
| uncomment:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-none hljs" data-lang="none">#MX4J_ADDRESS="-Dmx4jaddress=0.0.0.0" |
| |
| #MX4J_PORT="-Dmx4jport=8081"</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="metric-reporters"><a class="anchor" href="#metric-reporters"></a><a class="link" href="#metric-reporters">Metric Reporters</a></h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>As mentioned at the top of this section on monitoring the Cassandra |
| metrics can be exported to a number of monitoring system a number of |
| <a href="http://metrics.dropwizard.io/3.1.0/getting-started/#other-reporting">built |
| in</a> and <a href="http://metrics.dropwizard.io/3.1.0/manual/third-party/">third |
| party</a> reporter plugins.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The configuration of these plugins is managed by the |
| <a href="https://github.com/addthis/metrics-reporter-config">metrics reporter |
| config project</a>. There is a sample configuration file located at |
| <code>conf/metrics-reporter-config-sample.yaml</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Once configured, you simply start cassandra with the flag |
| <code>-Dcassandra.metricsReporterConfigFile=metrics-reporter-config.yaml</code>. |
| The specified .yaml file plus any 3rd party reporter jars must all be in |
| Cassandra’s classpath.</p> |
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