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   <div class="section" id="monitoring">
 <span id="monitoring-metrics"></span><h1>Monitoring<a class="headerlink" href="#monitoring" title="Permalink to this headline">¶</a></h1>
 <p>Metrics in Cassandra are managed using the <a class="reference external" 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 class="reference external" href="http://metrics.dropwizard.io/3.1.0/getting-started/#other-reporting">built in</a> and <a class="reference external" href="http://metrics.dropwizard.io/3.1.0/manual/third-party/">third party</a> reporter plugins.</p>
 <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 class="section" id="metric-types">
 <h2>Metric Types<a class="headerlink" href="#metric-types" title="Permalink to this headline">¶</a></h2>
 <p>All metrics reported by cassandra fit into one of the following types.</p>
 <dl>
 <dt><code class="docutils literal notranslate"><span class="pre">Gauge</span></code></dt><dd><p>An instantaneous measurement of a value.</p>
 </dd>
 <dt><code class="docutils literal notranslate"><span class="pre">Counter</span></code></dt><dd><p>A gauge for an <code class="docutils literal notranslate"><span class="pre">AtomicLong</span></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><code class="docutils literal notranslate"><span class="pre">Histogram</span></code></dt><dd><p>Measures the statistical distribution of values in a stream of data.</p>
 <p>In addition to minimum, maximum, mean, etc., it also measures median, 75th, 90th, 95th, 98th, 99th, and 99.9th
 percentiles.</p>
 </dd>
 <dt><code class="docutils literal notranslate"><span class="pre">Timer</span></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><code class="docutils literal notranslate"><span class="pre">Latency</span></code></dt><dd><p>Special type that tracks latency (in microseconds) with a <code class="docutils literal notranslate"><span class="pre">Timer</span></code> plus a <code class="docutils literal notranslate"><span class="pre">Counter</span></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><code class="docutils literal notranslate"><span class="pre">Meter</span></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 class="section" id="table-metrics">
 <span id="id1"></span><h2>Table Metrics<a class="headerlink" href="#table-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Each table in Cassandra has metrics responsible for tracking its state and performance.</p>
 <p>The metric names are all appended with the specific <code class="docutils literal notranslate"><span class="pre">Keyspace</span></code> and <code class="docutils literal notranslate"><span class="pre">Table</span></code> name.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Table.&lt;MetricName&gt;.&lt;Keyspace&gt;.&lt;Table&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Table,keyspace=&lt;Keyspace&gt;,scope=&lt;Table&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <div class="admonition note">
 <p class="admonition-title">Note</p>
 <p>There is a special table called ‘<code class="docutils literal notranslate"><span class="pre">all</span></code>’ without a keyspace. This represents the aggregation of metrics across
 <strong>all</strong> tables and keyspaces on the node.</p>
 </div>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 19%" />
 <col style="width: 6%" />
 <col style="width: 75%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>AdditionalWrites</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of additional writes sent to the replicas (other than the intial contacted ones).</p></td>
 </tr>
 <tr class="row-odd"><td><p>AllMemtablesLiveDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-even"><td><p>AllMemtablesOffHeapDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total amount of data stored in the memtables (2i and pending flush memtables included) that resides <strong>off</strong>-heap.</p></td>
 </tr>
 <tr class="row-odd"><td><p>AllMemtablesOffHeapSize (Deprecated)</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total amount of data stored in the memtables (2i and pending flush memtables included) that resides <strong>off</strong>-heap.</p></td>
 </tr>
 <tr class="row-even"><td><p>AllMemtablesOnHeapDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total amount of data stored in the memtables (2i and pending flush memtables included) that resides <strong>on</strong>-heap.</p></td>
 </tr>
 <tr class="row-odd"><td><p>AllMemtablesOnHeapSize (Deprecated)</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total amount of data stored in the memtables (2i and pending flush memtables included) that resides <strong>on</strong>-heap.</p></td>
 </tr>
 <tr class="row-even"><td><p>AnticompactionTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent anticompacting before a consistent repair.</p></td>
 </tr>
 <tr class="row-odd"><td><p>BloomFilterDiskSpaceUsed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Disk space used by bloom filter (in bytes).</p></td>
 </tr>
 <tr class="row-even"><td><p>BloomFilterFalsePositives</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Number of false positives on table’s bloom filter.</p></td>
 </tr>
 <tr class="row-odd"><td><p>BloomFilterFalseRatio</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>False positive ratio of table’s bloom filter.</p></td>
 </tr>
 <tr class="row-even"><td><p>BloomFilterOffHeapMemoryUsed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Off-heap memory used by bloom filter.</p></td>
 </tr>
 <tr class="row-odd"><td><p>BytesAnticompacted</p></td>
 <td><p>Counter</p></td>
 <td><p>How many bytes we anticompacted.</p></td>
 </tr>
 <tr class="row-even"><td><p>BytesFlushed</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of bytes flushed since server [re]start.</p></td>
 </tr>
 <tr class="row-odd"><td><p>BytesMutatedAnticompaction</p></td>
 <td><p>Counter</p></td>
 <td><p>How many bytes we avoided anticompacting because the sstable was fully contained in the repaired range.</p></td>
 </tr>
 <tr class="row-even"><td><p>BytesPendingRepair</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of table data isolated for an ongoing incremental repair</p></td>
 </tr>
 <tr class="row-odd"><td><p>BytesRepaired</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of table data repaired on disk</p></td>
 </tr>
 <tr class="row-even"><td><p>BytesUnrepaired</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of table data unrepaired on disk</p></td>
 </tr>
 <tr class="row-odd"><td><p>BytesValidated</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram over the amount of bytes read during validation.</p></td>
 </tr>
 <tr class="row-even"><td><p>CasCommit</p></td>
 <td><p>Latency</p></td>
 <td><p>Latency of paxos commit round.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CasPrepare</p></td>
 <td><p>Latency</p></td>
 <td><p>Latency of paxos prepare round.</p></td>
 </tr>
 <tr class="row-even"><td><p>CasPropose</p></td>
 <td><p>Latency</p></td>
 <td><p>Latency of paxos propose round.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ColUpdateTimeDeltaHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of column update time delta on this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>CompactionBytesWritten</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of bytes written by compaction since server [re]start.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CompressionMetadataOffHeapMemoryUsed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Off-heap memory used by compression meta data.</p></td>
 </tr>
 <tr class="row-even"><td><p>CompressionRatio</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>Current compression ratio for all SSTables.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CoordinatorReadLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Coordinator read latency for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>CoordinatorScanLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Coordinator range scan latency for this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CoordinatorWriteLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Coordinator write latency for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>DroppedMutations</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of dropped mutations on this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>EstimatedColumnCountHistogram</p></td>
 <td><p>Gauge&lt;long[]&gt;</p></td>
 <td><p>Histogram of estimated number of columns.</p></td>
 </tr>
 <tr class="row-even"><td><p>EstimatedPartitionCount</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Approximate number of keys in table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>EstimatedPartitionSizeHistogram</p></td>
 <td><p>Gauge&lt;long[]&gt;</p></td>
 <td><p>Histogram of estimated partition size (in bytes).</p></td>
 </tr>
 <tr class="row-even"><td><p>IndexSummaryOffHeapMemoryUsed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Off-heap memory used by index summary.</p></td>
 </tr>
 <tr class="row-odd"><td><p>KeyCacheHitRate</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>Key cache hit rate for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>LiveDiskSpaceUsed</p></td>
 <td><p>Counter</p></td>
 <td><p>Disk space used by SSTables belonging to this table (in bytes).</p></td>
 </tr>
 <tr class="row-odd"><td><p>LiveSSTableCount</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Number of SSTables on disk for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>LiveScannedHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of live cells scanned in queries on this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>MaxPartitionSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of the largest compacted partition (in bytes).</p></td>
 </tr>
 <tr class="row-even"><td><p>MeanPartitionSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of the average compacted partition (in bytes).</p></td>
 </tr>
 <tr class="row-odd"><td><p>MemtableColumnsCount</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total number of columns present in the memtable.</p></td>
 </tr>
 <tr class="row-even"><td><p>MemtableLiveDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total amount of live data stored in the memtable, excluding any data structure overhead.</p></td>
 </tr>
 <tr class="row-odd"><td><p>MemtableOffHeapDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-even"><td><p>MemtableOffHeapSize (Deprecated)</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-odd"><td><p>MemtableOnHeapDataSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-even"><td><p>MemtableOnHeapSize (Deprecated)</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-odd"><td><p>MemtableSwitchCount</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of times flush has resulted in the memtable being switched out.</p></td>
 </tr>
 <tr class="row-even"><td><p>MinPartitionSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size of the smallest compacted partition (in bytes).</p></td>
 </tr>
 <tr class="row-odd"><td><p>MutatedAnticompactionGauge</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>Ratio of bytes mutated vs total bytes repaired.</p></td>
 </tr>
 <tr class="row-even"><td><p>PartitionsValidated</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram over the number of partitions read during validation.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PendingCompactions</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Estimate of number of pending compactions for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>PendingFlushes</p></td>
 <td><p>Counter</p></td>
 <td><p>Estimated number of flush tasks pending for this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PercentRepaired</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>Percent of table data that is repaired on disk.</p></td>
 </tr>
 <tr class="row-even"><td><p>RangeLatency</p></td>
 <td><p>Latency</p></td>
 <td><p>Local range scan latency for this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ReadLatency</p></td>
 <td><p>Latency</p></td>
 <td><p>Local read latency for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>ReadRepairRequests</p></td>
 <td><p>Meter</p></td>
 <td><p>Throughput for mutations generated by read-repair.</p></td>
 </tr>
 <tr class="row-odd"><td><p>RepairJobsCompleted</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of completed repairs as coordinator on this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>RepairJobsStarted</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of started repairs as coordinator on this table.</p></td>
 </tr>
 <tr class="row-odd"><td><p>RepairSyncTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent doing streaming during repair.</p></td>
 </tr>
 <tr class="row-even"><td><p>RepairedDataTrackingOverreadRows</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of the amount of the additonal rows of the repaired data read.</p></td>
 </tr>
 <tr class="row-odd"><td><p>RepairedDataTrackingOverreadTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent reading the additional rows of the repaired data.</p></td>
 </tr>
 <tr class="row-even"><td><p>ReplicaFilteringProtectionRequests</p></td>
 <td><p>Meter</p></td>
 <td><p>Throughput for row completion requests during replica filtering protection.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ReplicaFilteringProtectionRowsCachedPerQuery</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of the number of rows cached per query when replica filtering protection is engaged.</p></td>
 </tr>
 <tr class="row-even"><td><p>RowCacheHit</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of table row cache hits.</p></td>
 </tr>
 <tr class="row-odd"><td><p>RowCacheHitOutOfRange</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of table row cache hits that do not satisfy the query filter, thus went to disk.</p></td>
 </tr>
 <tr class="row-even"><td><p>RowCacheMiss</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of table row cache misses.</p></td>
 </tr>
 <tr class="row-odd"><td><p>SSTablesPerReadHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>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 class="row-even"><td><p>ShortReadProtectionRequests</p></td>
 <td><p>Meter</p></td>
 <td><p>Throughput for requests to get extra rows during short read protection.</p></td>
 </tr>
 <tr class="row-odd"><td><p>SpeculativeFailedRetries</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of speculative retries that failed to prevent a timeout</p></td>
 </tr>
 <tr class="row-even"><td><p>SpeculativeInsufficientReplicas</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of speculative retries that couldn’t be attempted due to lack of replicas</p></td>
 </tr>
 <tr class="row-odd"><td><p>SpeculativeRetries</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of times speculative retries were sent for this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>SpeculativeSampleLatencyNanos</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>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 class="row-odd"><td><p>TombstoneScannedHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of tombstones scanned in queries on this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>TotalDiskSpaceUsed</p></td>
 <td><p>Counter</p></td>
 <td><p>Total disk space used by SSTables belonging to this table, including obsolete ones waiting to be GC’d.</p></td>
 </tr>
 <tr class="row-odd"><td><p>TrueSnapshotsSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Disk space used by snapshots of this table including all SSTable components.</p></td>
 </tr>
 <tr class="row-even"><td><p>ValidationTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent doing validation compaction during repair.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ViewLockAcquireTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time taken acquiring a partition lock for materialized view updates on this table.</p></td>
 </tr>
 <tr class="row-even"><td><p>ViewReadTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Time taken during the local read of a materialized view update.</p></td>
 </tr>
 <tr class="row-odd"><td><p>WaitingOnFreeMemtableSpace</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of time spent waiting for free memtable space, either on- or off-heap.</p></td>
 </tr>
 <tr class="row-even"><td><p>WriteLatency</p></td>
 <td><p>Latency</p></td>
 <td><p>Local write latency for this table.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="keyspace-metrics">
 <h2>Keyspace Metrics<a class="headerlink" href="#keyspace-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Each keyspace in Cassandra has metrics responsible for tracking its state and performance.</p>
 <p>Most of these metrics are the same as the <code class="docutils literal notranslate"><span class="pre">Table</span> <span class="pre">Metrics</span></code> above, only they are aggregated at the Keyspace level. Only the keyspace specific metrics are specified in the table below.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.keyspace.&lt;MetricName&gt;.&lt;Keyspace&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Keyspace,keyspace=&lt;Keyspace&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 20%" />
 <col style="width: 7%" />
 <col style="width: 73%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>IdealCLWriteLatency</p></td>
 <td><p>Latency</p></td>
 <td><p>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 class="row-odd"><td><p>RepairPrepareTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Total time spent preparing for repair.</p></td>
 </tr>
 <tr class="row-even"><td><p>RepairTime</p></td>
 <td><p>Timer</p></td>
 <td><p>Total time spent as repair coordinator.</p></td>
 </tr>
 <tr class="row-odd"><td><p>WriteFailedIdealCL</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of writes that failed to achieve the configured ideal consistency level or 0 if none is configured</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="threadpool-metrics">
 <h2>ThreadPool Metrics<a class="headerlink" href="#threadpool-metrics" title="Permalink to this headline">¶</a></h2>
 <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>
 <p>The metric names are all appended with the specific <code class="docutils literal notranslate"><span class="pre">ThreadPool</span></code> name.  The thread pools are also categorized under a
 specific type.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.ThreadPools.&lt;MetricName&gt;.&lt;Path&gt;.&lt;ThreadPoolName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=ThreadPools,path=&lt;Path&gt;,scope=&lt;ThreadPoolName&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 15%" />
 <col style="width: 10%" />
 <col style="width: 74%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ActiveTasks</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Number of tasks being actively worked on by this pool.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CompletedTasks</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of tasks completed.</p></td>
 </tr>
 <tr class="row-even"><td><p>CurrentlyBlockedTask</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of tasks that are currently blocked due to queue saturation but on retry will become unblocked.</p></td>
 </tr>
 <tr class="row-odd"><td><p>MaxPoolSize</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>The maximum number of threads in this pool.</p></td>
 </tr>
 <tr class="row-even"><td><p>MaxTasksQueued</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>The maximum number of tasks queued before a task get blocked.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PendingTasks</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Number of queued tasks queued up on this pool.</p></td>
 </tr>
 <tr class="row-even"><td><p>TotalBlockedTasks</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of tasks that were blocked due to queue saturation.</p></td>
 </tr>
 </tbody>
 </table>
 <p>The following thread pools can be monitored.</p>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 26%" />
 <col style="width: 13%" />
 <col style="width: 61%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>AntiEntropyStage</p></td>
 <td><p>internal</p></td>
 <td><p>Builds merkle tree for repairs</p></td>
 </tr>
 <tr class="row-odd"><td><p>CacheCleanupExecutor</p></td>
 <td><p>internal</p></td>
 <td><p>Cache maintenance performed on this thread pool</p></td>
 </tr>
 <tr class="row-even"><td><p>CompactionExecutor</p></td>
 <td><p>internal</p></td>
 <td><p>Compactions are run on these threads</p></td>
 </tr>
 <tr class="row-odd"><td><p>CounterMutationStage</p></td>
 <td><p>request</p></td>
 <td><p>Responsible for counter writes</p></td>
 </tr>
 <tr class="row-even"><td><p>GossipStage</p></td>
 <td><p>internal</p></td>
 <td><p>Handles gossip requests</p></td>
 </tr>
 <tr class="row-odd"><td><p>HintsDispatcher</p></td>
 <td><p>internal</p></td>
 <td><p>Performs hinted handoff</p></td>
 </tr>
 <tr class="row-even"><td><p>InternalResponseStage</p></td>
 <td><p>internal</p></td>
 <td><p>Responsible for intra-cluster callbacks</p></td>
 </tr>
 <tr class="row-odd"><td><p>MemtableFlushWriter</p></td>
 <td><p>internal</p></td>
 <td><p>Writes memtables to disk</p></td>
 </tr>
 <tr class="row-even"><td><p>MemtablePostFlush</p></td>
 <td><p>internal</p></td>
 <td><p>Cleans up commit log after memtable is written to disk</p></td>
 </tr>
 <tr class="row-odd"><td><p>MemtableReclaimMemory</p></td>
 <td><p>internal</p></td>
 <td><p>Memtable recycling</p></td>
 </tr>
 <tr class="row-even"><td><p>MigrationStage</p></td>
 <td><p>internal</p></td>
 <td><p>Runs schema migrations</p></td>
 </tr>
 <tr class="row-odd"><td><p>MiscStage</p></td>
 <td><p>internal</p></td>
 <td><p>Misceleneous tasks run here</p></td>
 </tr>
 <tr class="row-even"><td><p>MutationStage</p></td>
 <td><p>request</p></td>
 <td><p>Responsible for all other writes</p></td>
 </tr>
 <tr class="row-odd"><td><p>Native-Transport-Requests</p></td>
 <td><p>transport</p></td>
 <td><p>Handles client CQL requests</p></td>
 </tr>
 <tr class="row-even"><td><p>PendingRangeCalculator</p></td>
 <td><p>internal</p></td>
 <td><p>Calculates token range</p></td>
 </tr>
 <tr class="row-odd"><td><p>PerDiskMemtableFlushWriter_0</p></td>
 <td><p>internal</p></td>
 <td><p>Responsible for writing a spec (there is one of these per disk 0-N)</p></td>
 </tr>
 <tr class="row-even"><td><p>ReadRepairStage</p></td>
 <td><p>request</p></td>
 <td><p>ReadRepair happens on this thread pool</p></td>
 </tr>
 <tr class="row-odd"><td><p>ReadStage</p></td>
 <td><p>request</p></td>
 <td><p>Local reads run on this thread pool</p></td>
 </tr>
 <tr class="row-even"><td><p>RequestResponseStage</p></td>
 <td><p>request</p></td>
 <td><p>Coordinator requests to the cluster run on this thread pool</p></td>
 </tr>
 <tr class="row-odd"><td><p>Sampler</p></td>
 <td><p>internal</p></td>
 <td><p>Responsible for re-sampling the index summaries of SStables</p></td>
 </tr>
 <tr class="row-even"><td><p>SecondaryIndexManagement</p></td>
 <td><p>internal</p></td>
 <td><p>Performs updates to secondary indexes</p></td>
 </tr>
 <tr class="row-odd"><td><p>ValidationExecutor</p></td>
 <td><p>internal</p></td>
 <td><p>Performs validation compaction or scrubbing</p></td>
 </tr>
 <tr class="row-even"><td><p>ViewBuildExecutor</p></td>
 <td><p>internal</p></td>
 <td><p>Performs materialized views initial build</p></td>
 </tr>
 <tr class="row-odd"><td><p>ViewMutationStage</p></td>
 <td><p>request</p></td>
 <td><p>Responsible for materialized view writes</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="client-request-metrics">
 <h2>Client Request Metrics<a class="headerlink" href="#client-request-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Client requests have their own set of metrics that encapsulate the work happening at coordinator level.</p>
 <p>Different types of client requests are broken down by <code class="docutils literal notranslate"><span class="pre">RequestType</span></code>.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.ClientRequest.&lt;MetricName&gt;.&lt;RequestType&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=ClientRequest,scope=&lt;RequestType&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <dl class="field-list">
 <dt class="field-odd">RequestType</dt>
 <dd class="field-odd"><p>CASRead</p>
 </dd>
 <dt class="field-even">Description</dt>
 <dd class="field-even"><p>Metrics related to transactional read requests.</p>
 </dd>
 <dt class="field-odd">Metrics</dt>
 <dd class="field-odd"><table class="docutils align-default">
 <colgroup>
 <col style="width: 21%" />
 <col style="width: 14%" />
 <col style="width: 65%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ConditionNotMet</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transaction preconditions did not match current values.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ContentionHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>How many contended reads were encountered</p></td>
 </tr>
 <tr class="row-even"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transaction failures encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p>Unavailables</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of unavailable exceptions encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>UnfinishedCommit</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transactions that were committed on read.</p></td>
 </tr>
 <tr class="row-even"><td><p> </p></td>
 <td><p>Latency</p></td>
 <td><p>Transaction read latency.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dt class="field-even">RequestType</dt>
 <dd class="field-even"><p>CASWrite</p>
 </dd>
 <dt class="field-odd">Description</dt>
 <dd class="field-odd"><p>Metrics related to transactional write requests.</p>
 </dd>
 <dt class="field-even">Metrics</dt>
 <dd class="field-even"><table class="docutils align-default">
 <colgroup>
 <col style="width: 21%" />
 <col style="width: 14%" />
 <col style="width: 65%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ConditionNotMet</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transaction preconditions did not match current values.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ContentionHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>How many contended writes were encountered</p></td>
 </tr>
 <tr class="row-even"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transaction failures encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>MutationSizeHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>Total size in bytes of the requests mutations.</p></td>
 </tr>
 <tr class="row-even"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>UnfinishedCommit</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transactions that were committed on write.</p></td>
 </tr>
 <tr class="row-even"><td><p> </p></td>
 <td><p>Latency</p></td>
 <td><p>Transaction write latency.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dt class="field-odd">RequestType</dt>
 <dd class="field-odd"><p>Read</p>
 </dd>
 <dt class="field-even">Description</dt>
 <dd class="field-even"><p>Metrics related to standard read requests.</p>
 </dd>
 <dt class="field-odd">Metrics</dt>
 <dd class="field-odd"><table class="docutils align-default">
 <colgroup>
 <col style="width: 22%" />
 <col style="width: 15%" />
 <col style="width: 64%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of read failures encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p>Unavailables</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of unavailable exceptions encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p> </p></td>
 <td><p>Latency</p></td>
 <td><p>Read latency.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dt class="field-even">RequestType</dt>
 <dd class="field-even"><p>RangeSlice</p>
 </dd>
 <dt class="field-odd">Description</dt>
 <dd class="field-odd"><p>Metrics related to token range read requests.</p>
 </dd>
 <dt class="field-even">Metrics</dt>
 <dd class="field-even"><table class="docutils align-default">
 <colgroup>
 <col style="width: 22%" />
 <col style="width: 15%" />
 <col style="width: 64%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of range query failures encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p>Unavailables</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of unavailable exceptions encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p> </p></td>
 <td><p>Latency</p></td>
 <td><p>Range query latency.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dt class="field-odd">RequestType</dt>
 <dd class="field-odd"><p>Write</p>
 </dd>
 <dt class="field-even">Description</dt>
 <dd class="field-even"><p>Metrics related to regular write requests.</p>
 </dd>
 <dt class="field-odd">Metrics</dt>
 <dd class="field-odd"><table class="docutils align-default">
 <colgroup>
 <col style="width: 22%" />
 <col style="width: 15%" />
 <col style="width: 64%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of write failures encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>MutationSizeHistogram</p></td>
 <td><p>Histogram</p></td>
 <td><p>Total size in bytes of the requests mutations.</p></td>
 </tr>
 <tr class="row-even"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Unavailables</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of unavailable exceptions encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p> </p></td>
 <td><p>Latency</p></td>
 <td><p>Write latency.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 <dt class="field-even">RequestType</dt>
 <dd class="field-even"><p>ViewWrite</p>
 </dd>
 <dt class="field-odd">Description</dt>
 <dd class="field-odd"><p>Metrics related to materialized view write wrtes.</p>
 </dd>
 <dt class="field-even">Metrics</dt>
 <dd class="field-even"><table class="docutils align-default">
 <colgroup>
 <col style="width: 17%" />
 <col style="width: 11%" />
 <col style="width: 72%" />
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p>Failures</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of transaction failures encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p>Timeouts</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of timeouts encountered.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Unavailables</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of unavailable exceptions encountered.</p></td>
 </tr>
 <tr class="row-even"><td><p>ViewPendingMutations</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>ViewReplicasAttempted - ViewReplicasSuccess.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ViewReplicasAttempted</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of attempted view replica writes.</p></td>
 </tr>
 <tr class="row-even"><td><p>ViewReplicasSuccess</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of succeded view replica writes.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ViewWriteLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Time between when mutation is applied to base table and when CL.ONE is achieved on view.</p></td>
 </tr>
 </tbody>
 </table>
 </dd>
 </dl>
 </div>
 <div class="section" id="cache-metrics">
 <h2>Cache Metrics<a class="headerlink" href="#cache-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Cassandra caches have metrics to track the effectivness of the caches. Though the <code class="docutils literal notranslate"><span class="pre">Table</span> <span class="pre">Metrics</span></code> might be more useful.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Cache.&lt;MetricName&gt;.&lt;CacheName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Cache,scope=&lt;CacheName&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 33%" />
 <col style="width: 18%" />
 <col style="width: 49%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Capacity</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Cache capacity in bytes.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Entries</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Total number of cache entries.</p></td>
 </tr>
 <tr class="row-even"><td><p>FifteenMinuteCacheHitRate</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>15m cache hit rate.</p></td>
 </tr>
 <tr class="row-odd"><td><p>FiveMinuteCacheHitRate</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>5m cache hit rate.</p></td>
 </tr>
 <tr class="row-even"><td><p>HitRate</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>All time cache hit rate.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Hits</p></td>
 <td><p>Meter</p></td>
 <td><p>Total number of cache hits.</p></td>
 </tr>
 <tr class="row-even"><td><p>MissLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Latency of misses.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Misses</p></td>
 <td><p>Meter</p></td>
 <td><p>Total number of cache misses.</p></td>
 </tr>
 <tr class="row-even"><td><p>OneMinuteCacheHitRate</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>1m cache hit rate.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Requests</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total number of cache requests.</p></td>
 </tr>
 <tr class="row-even"><td><p>Size</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total size of occupied cache, in bytes.</p></td>
 </tr>
 </tbody>
 </table>
 <p>The following caches are covered:</p>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 38%" />
 <col style="width: 62%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ChunkCache</p></td>
 <td><p>In process uncompressed page cache.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CounterCache</p></td>
 <td><p>Keeps hot counters in memory for performance.</p></td>
 </tr>
 <tr class="row-even"><td><p>KeyCache</p></td>
 <td><p>Cache for partition to sstable offsets.</p></td>
 </tr>
 <tr class="row-odd"><td><p>RowCache</p></td>
 <td><p>Cache for rows kept in memory.</p></td>
 </tr>
 </tbody>
 </table>
 <div class="admonition note">
 <p class="admonition-title">Note</p>
 <p>Misses and MissLatency are only defined for the ChunkCache</p>
 </div>
 </div>
 <div class="section" id="cql-metrics">
 <h2>CQL Metrics<a class="headerlink" href="#cql-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to CQL prepared statement caching.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.CQL.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=CQL,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 13%" />
 <col style="width: 64%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>PreparedStatementsCount</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Number of cached prepared statements.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PreparedStatementsEvicted</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of prepared statements evicted from the prepared statement cache</p></td>
 </tr>
 <tr class="row-even"><td><p>PreparedStatementsExecuted</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of prepared statements executed.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PreparedStatementsRatio</p></td>
 <td><p>Gauge&lt;Double&gt;</p></td>
 <td><p>Percentage of statements that are prepared vs unprepared.</p></td>
 </tr>
 <tr class="row-even"><td><p>RegularStatementsExecuted</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of <strong>non</strong> prepared statements executed.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="droppedmessage-metrics">
 <span id="dropped-metrics"></span><h2>DroppedMessage Metrics<a class="headerlink" href="#droppedmessage-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to tracking dropped messages for different types of requests.
 Dropped writes are stored and retried by <code class="docutils literal notranslate"><span class="pre">Hinted</span> <span class="pre">Handoff</span></code></p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.DroppedMessage.&lt;MetricName&gt;.&lt;Type&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=DroppedMessage,scope=&lt;Type&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 36%" />
 <col style="width: 19%" />
 <col style="width: 45%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>CrossNodeDroppedLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>The dropped latency across nodes.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Dropped</p></td>
 <td><p>Meter</p></td>
 <td><p>Number of dropped messages.</p></td>
 </tr>
 <tr class="row-even"><td><p>InternalDroppedLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>The dropped latency within node.</p></td>
 </tr>
 </tbody>
 </table>
 <p>The different types of messages tracked are:</p>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 39%" />
 <col style="width: 61%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>BATCH_REMOVE</p></td>
 <td><p>Batchlog cleanup (after succesfully applied)</p></td>
 </tr>
 <tr class="row-odd"><td><p>BATCH_STORE</p></td>
 <td><p>Batchlog write</p></td>
 </tr>
 <tr class="row-even"><td><p>COUNTER_MUTATION</p></td>
 <td><p>Counter writes</p></td>
 </tr>
 <tr class="row-odd"><td><p>HINT</p></td>
 <td><p>Hint replay</p></td>
 </tr>
 <tr class="row-even"><td><p>MUTATION</p></td>
 <td><p>Regular writes</p></td>
 </tr>
 <tr class="row-odd"><td><p>PAGED_SLICE</p></td>
 <td><p>Paged read</p></td>
 </tr>
 <tr class="row-even"><td><p>RANGE_SLICE</p></td>
 <td><p>Token range read</p></td>
 </tr>
 <tr class="row-odd"><td><p>READ</p></td>
 <td><p>Regular reads</p></td>
 </tr>
 <tr class="row-even"><td><p>READ_REPAIR</p></td>
 <td><p>Read repair</p></td>
 </tr>
 <tr class="row-odd"><td><p>REQUEST_RESPONSE</p></td>
 <td><p>RPC Callbacks</p></td>
 </tr>
 <tr class="row-even"><td><p>_TRACE</p></td>
 <td><p>Tracing writes</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="streaming-metrics">
 <h2>Streaming Metrics<a class="headerlink" href="#streaming-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics reported during <code class="docutils literal notranslate"><span class="pre">Streaming</span></code> operations, such as repair, bootstrap, rebuild.</p>
 <p>These metrics are specific to a peer endpoint, with the source node being the node you are pulling the metrics from.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Streaming.&lt;MetricName&gt;.&lt;PeerIP&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Streaming,scope=&lt;PeerIP&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 13%" />
 <col style="width: 64%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>IncomingBytes</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of bytes streamed to this node from the peer.</p></td>
 </tr>
 <tr class="row-odd"><td><p>IncomingProcessTime</p></td>
 <td><p>Timer</p></td>
 <td><p>The time spent on processing the incoming stream message from the peer.</p></td>
 </tr>
 <tr class="row-even"><td><p>OutgoingBytes</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of bytes streamed to the peer endpoint from this node.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="compaction-metrics">
 <h2>Compaction Metrics<a class="headerlink" href="#compaction-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to <code class="docutils literal notranslate"><span class="pre">Compaction</span></code> work.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Compaction.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Compaction,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 13%" />
 <col style="width: 20%" />
 <col style="width: 68%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>BytesCompacted</p></td>
 <td><p>Counter</p></td>
 <td><p>Total number of bytes compacted since server [re]start.</p></td>
 </tr>
 <tr class="row-odd"><td><p>CompletedTasks</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Number of completed compactions since server [re]start.</p></td>
 </tr>
 <tr class="row-even"><td><p>PendingTasks</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Estimated number of compactions remaining to perform.</p></td>
 </tr>
 <tr class="row-odd"><td><p>PendingTasksByTableName</p></td>
 <td><p>Gauge&lt;Map&lt;String, Map&lt;String, Integer&gt;&gt;&gt;</p></td>
 <td><p>Estimated number of compactions remaining to perform, grouped by keyspace and then table name. This info is also kept in <code class="docutils literal notranslate"><span class="pre">Table</span> <span class="pre">Metrics</span></code>.</p></td>
 </tr>
 <tr class="row-even"><td><p>TotalCompactionsCompleted</p></td>
 <td><p>Meter</p></td>
 <td><p>Throughput of completed compactions since server [re]start.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="commitlog-metrics">
 <h2>CommitLog Metrics<a class="headerlink" href="#commitlog-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to the <code class="docutils literal notranslate"><span class="pre">CommitLog</span></code></p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.CommitLog.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=CommitLog,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 18%" />
 <col style="width: 9%" />
 <col style="width: 73%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>CompletedTasks</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total number of commit log messages written since [re]start.</p></td>
 </tr>
 <tr class="row-odd"><td><p>OverSizedMutations</p></td>
 <td><p>Meter</p></td>
 <td><p>Throughput for mutations that exceed limit.</p></td>
 </tr>
 <tr class="row-even"><td><p>PendingTasks</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Number of commit log messages written but yet to be fsync’d.</p></td>
 </tr>
 <tr class="row-odd"><td><p>TotalCommitLogSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Current size, in bytes, used by all the commit log segments.</p></td>
 </tr>
 <tr class="row-even"><td><p>WaitingOnCommit</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent waiting on CL fsync; for Periodic this is only occurs when the sync is lagging its sync interval.</p></td>
 </tr>
 <tr class="row-odd"><td><p>WaitingOnSegmentAllocation</p></td>
 <td><p>Timer</p></td>
 <td><p>Time spent waiting for a CommitLogSegment to be allocated - under normal conditions this should be zero.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="storage-metrics">
 <h2>Storage Metrics<a class="headerlink" href="#storage-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to the storage engine.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Storage.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Storage,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 17%" />
 <col style="width: 9%" />
 <col style="width: 75%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Exceptions</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of internal exceptions caught. Under normal exceptions this should be zero.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Load</p></td>
 <td><p>Counter</p></td>
 <td><p>Size, in bytes, of the on disk data size this node manages.</p></td>
 </tr>
 <tr class="row-even"><td><p>TotalHints</p></td>
 <td><p>Counter</p></td>
 <td><p>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 class="row-odd"><td><p>TotalHintsInProgress</p></td>
 <td><p>Counter</p></td>
 <td><p>Number of hints attemping to be sent currently.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="hintsservice-metrics">
 <span id="id2"></span><h2>HintsService Metrics<a class="headerlink" href="#hintsservice-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to the Hints delivery service.  There are also some metrics related to hints tracked in <code class="docutils literal notranslate"><span class="pre">Storage</span> <span class="pre">Metrics</span></code></p>
 <p>These metrics include the peer endpoint <strong>in the metric name</strong></p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.HintsService.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=HintsService,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 27%" />
 <col style="width: 14%" />
 <col style="width: 59%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Hint_delays</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of hint delivery delays (in milliseconds)</p></td>
 </tr>
 <tr class="row-odd"><td><p>Hint_delays-&lt;PeerIP&gt;</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of hint delivery delays (in milliseconds) per peer</p></td>
 </tr>
 <tr class="row-even"><td><p>HintsFailed</p></td>
 <td><p>Meter</p></td>
 <td><p>A meter of the hints that failed deliver</p></td>
 </tr>
 <tr class="row-odd"><td><p>HintsSucceeded</p></td>
 <td><p>Meter</p></td>
 <td><p>A meter of the hints successfully delivered</p></td>
 </tr>
 <tr class="row-even"><td><p>HintsTimedOut</p></td>
 <td><p>Meter</p></td>
 <td><p>A meter of the hints that timed out</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="sstable-index-metrics">
 <h2>SSTable Index Metrics<a class="headerlink" href="#sstable-index-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to the SSTable index metadata.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Index.&lt;MetricName&gt;.RowIndexEntry</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Index</span> <span class="pre">scope=RowIndexEntry,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 12%" />
 <col style="width: 65%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>IndexInfoCount</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of the number of on-heap index entries managed across all SSTables.</p></td>
 </tr>
 <tr class="row-odd"><td><p>IndexInfoGets</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of the number index seeks performed per SSTable.</p></td>
 </tr>
 <tr class="row-even"><td><p>IndexedEntrySize</p></td>
 <td><p>Histogram</p></td>
 <td><p>Histogram of the on-heap size, in bytes, of the index across all SSTables.</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="bufferpool-metrics">
 <h2>BufferPool Metrics<a class="headerlink" href="#bufferpool-metrics" title="Permalink to this headline">¶</a></h2>
 <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>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.BufferPool.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=BufferPool,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 22%" />
 <col style="width: 11%" />
 <col style="width: 66%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Misses</p></td>
 <td><p>Meter</p></td>
 <td><p>The rate of misses in the pool. The higher this is the more allocations incurred.</p></td>
 </tr>
 <tr class="row-odd"><td><p>Size</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Size, in bytes, of the managed buffer pool</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="client-metrics">
 <h2>Client Metrics<a class="headerlink" href="#client-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specifc to client managment.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Client.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Client,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 13%" />
 <col style="width: 14%" />
 <col style="width: 72%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ClientsByProtocolVersion</p></td>
 <td><p>Gauge&lt;List&lt;Map&lt;String, String&gt;&gt;&gt;</p></td>
 <td><p>List of up to last 100 connections including protocol version. Can be reset with clearConnectionHistory operation in org.apache.cassandra.db:StorageService mbean.</p></td>
 </tr>
 <tr class="row-odd"><td><p>ConnectedNativeClients</p></td>
 <td><p>Gauge&lt;Integer&gt;</p></td>
 <td><p>Number of clients connected to this nodes native protocol server</p></td>
 </tr>
 <tr class="row-even"><td><p>ConnectedNativeClientsByUser</p></td>
 <td><p>Gauge&lt;Map&lt;String, Int&gt;</p></td>
 <td><p>Number of connnective native clients by username</p></td>
 </tr>
 <tr class="row-odd"><td><p>Connections</p></td>
 <td><p>Gauge&lt;List&lt;Map&lt;String, String&gt;&gt;</p></td>
 <td><p>List of all connections and their state information</p></td>
 </tr>
 <tr class="row-even"><td><p>RequestsSize</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>How many concurrent bytes used in currently processing requests</p></td>
 </tr>
 <tr class="row-odd"><td><p>RequestsSizeByIpDistribution</p></td>
 <td><p>Histogram</p></td>
 <td><p>How many concurrent bytes used in currently processing requests by different ips</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="batch-metrics">
 <h2>Batch Metrics<a class="headerlink" href="#batch-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to batch statements.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Batch.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Batch,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 25%" />
 <col style="width: 13%" />
 <col style="width: 63%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>PartitionsPerCounterBatch</p></td>
 <td><p>Histogram</p></td>
 <td><p>Distribution of the number of partitions processed per counter batch</p></td>
 </tr>
 <tr class="row-odd"><td><p>PartitionsPerLoggedBatch</p></td>
 <td><p>Histogram</p></td>
 <td><p>Distribution of the number of partitions processed per logged batch</p></td>
 </tr>
 <tr class="row-even"><td><p>PartitionsPerUnloggedBatch</p></td>
 <td><p>Histogram</p></td>
 <td><p>Distribution of the number of partitions processed per unlogged batch</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="read-repair-metrics">
 <h2>Read Repair Metrics<a class="headerlink" href="#read-repair-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to read repair operations.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.ReadRepair.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=ReadRepair,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 25%" />
 <col style="width: 13%" />
 <col style="width: 62%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>ReconcileRead</p></td>
 <td><p>Meter</p></td>
 <td><p>The rate of read-only read repairs, which do not mutate the replicas</p></td>
 </tr>
 <tr class="row-odd"><td><p>RepairedBlocking</p></td>
 <td><p>Meter</p></td>
 <td><p>The rate of blocking read repairs</p></td>
 </tr>
 <tr class="row-even"><td><p>SpeculatedRead</p></td>
 <td><p>Meter</p></td>
 <td><p>The rate of speculated reads during read repairs</p></td>
 </tr>
 <tr class="row-odd"><td><p>SpeculatedWrite</p></td>
 <td><p>Meter</p></td>
 <td><p>The rate of speculated writes during read repairs</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="messaging-metrics">
 <h2>Messaging Metrics<a class="headerlink" href="#messaging-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics for internode messaging.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Messaging.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Messaging,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 12%" />
 <col style="width: 65%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>&lt;DC&gt;-Latency</p></td>
 <td><p>Timer</p></td>
 <td><p>Latency of all internode messageing between this node and the datacenters.</p></td>
 </tr>
 <tr class="row-odd"><td><p>&lt;VERB&gt;-WaitLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Latency between the message creation time and the time being executed by VERB</p></td>
 </tr>
 <tr class="row-even"><td><p>CrossNodeLatency</p></td>
 <td><p>Timer</p></td>
 <td><p>Latency of all internode messaging between this node and the peers</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="internode-inbound-connection-metrics">
 <h2>Internode Inbound Connection Metrics<a class="headerlink" href="#internode-inbound-connection-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to inbound connections of internode messaging.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.InboundConnection.&lt;MetricName&gt;.&lt;IP&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=InboundConnection,scope=&lt;IP&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 28%" />
 <col style="width: 15%" />
 <col style="width: 57%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>CorruptFramesRecovered</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of corrupted frames recovered</p></td>
 </tr>
 <tr class="row-odd"><td><p>CorruptFramesUnrecovered</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of corrupted frames unrecovered</p></td>
 </tr>
 <tr class="row-even"><td><p>ErrorBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of error bytes</p></td>
 </tr>
 <tr class="row-odd"><td><p>ErrorCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of error count</p></td>
 </tr>
 <tr class="row-even"><td><p>ExpiredBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of expired bytes</p></td>
 </tr>
 <tr class="row-odd"><td><p>ExpiredCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of expired count</p></td>
 </tr>
 <tr class="row-even"><td><p>ScheduledBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes that are pending execution</p></td>
 </tr>
 <tr class="row-odd"><td><p>ScheduledCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of message that are pending execution</p></td>
 </tr>
 <tr class="row-even"><td><p>ProcessedBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes processed</p></td>
 </tr>
 <tr class="row-odd"><td><p>ProcessedCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of messages processed</p></td>
 </tr>
 <tr class="row-even"><td><p>ReceivedBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes received</p></td>
 </tr>
 <tr class="row-odd"><td><p>ReceivedCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of messages received</p></td>
 </tr>
 <tr class="row-even"><td><p>ThrottledCount</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of messages throttled</p></td>
 </tr>
 <tr class="row-odd"><td><p>ThrottledNanos</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated duration of throttling in nanoseconds</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="internode-outbound-connection-metrics">
 <h2>Internode Outbound Connection Metrics<a class="headerlink" href="#internode-outbound-connection-metrics" title="Permalink to this headline">¶</a></h2>
 <p>Metrics specific to outbound connections of internode messaging.</p>
 <p>Reported name format:</p>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics.Connection.&lt;MetricName&gt;.&lt;IP&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">org.apache.cassandra.metrics:type=Connection,scope=&lt;IP&gt;,name=&lt;MetricName&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 36%" />
 <col style="width: 9%" />
 <col style="width: 54%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessagePendingTasks</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of pending (Large|Small|Urgent) messages queued</p></td>
 </tr>
 <tr class="row-odd"><td><p>[Large|Small|Urgent]MessagePendingBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes of pending (Large|Small|Urgent) messages queued</p></td>
 </tr>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessageCompletedTasks</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of (Large|Small|Urgent) messages sent</p></td>
 </tr>
 <tr class="row-odd"><td><p>[Large|Small|Urgent]MessageCompletedBytes</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes of (Large|Small|Urgent) messages sent</p></td>
 </tr>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessageDroppedTasks</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of dropped (Large|Small|Urgent) messages</p></td>
 </tr>
 <tr class="row-odd"><td><p>[Large|Small|Urgent]MessageDroppedTasksDueToOverload</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of dropped (Large|Small|Urgent) messages due to overload</p></td>
 </tr>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessageDroppedBytesDueToOverload</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes of dropped (Large|Small|Urgent) messages due to overload</p></td>
 </tr>
 <tr class="row-odd"><td><p>[Large|Small|Urgent]MessageDroppedTasksDueToTimeout</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of dropped (Large|Small|Urgent) messages due to timeout</p></td>
 </tr>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessageDroppedBytesDueToTimeout</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes of dropped (Large|Small|Urgent) messages due to timeout</p></td>
 </tr>
 <tr class="row-odd"><td><p>[Large|Small|Urgent]MessageDroppedTasksDueToError</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of dropped (Large|Small|Urgent) messages due to error</p></td>
 </tr>
 <tr class="row-even"><td><p>[Large|Small|Urgent]MessageDroppedBytesDueToError</p></td>
 <td><p>Guage&lt;Long&gt;</p></td>
 <td><p>Estimated number of bytes of dropped (Large|Small|Urgent) messages due to error</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="jvm-metrics">
 <h2>JVM Metrics<a class="headerlink" href="#jvm-metrics" title="Permalink to this headline">¶</a></h2>
 <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 class="reference internal" href="#metric-reporters">Metric Reporters</a>.</p>
 <div class="section" id="bufferpool">
 <h3>BufferPool<a class="headerlink" href="#bufferpool" title="Permalink to this headline">¶</a></h3>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">jvm.buffers.&lt;direct|mapped&gt;.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">java.nio:type=BufferPool,name=&lt;direct|mapped&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 22%" />
 <col style="width: 12%" />
 <col style="width: 66%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Capacity</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Estimated total capacity of the buffers in this pool</p></td>
 </tr>
 <tr class="row-odd"><td><p>Count</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Estimated number of buffers in the pool</p></td>
 </tr>
 <tr class="row-even"><td><p>Used</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Estimated memory that the Java virtual machine is using for this buffer pool</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="filedescriptorratio">
 <h3>FileDescriptorRatio<a class="headerlink" href="#filedescriptorratio" title="Permalink to this headline">¶</a></h3>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">jvm.fd.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">java.lang:type=OperatingSystem,name=&lt;OpenFileDescriptorCount|MaxFileDescriptorCount&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 33%" />
 <col style="width: 18%" />
 <col style="width: 49%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Usage</p></td>
 <td><p>Ratio</p></td>
 <td><p>Ratio of used to total file descriptors</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="garbagecollector">
 <h3>GarbageCollector<a class="headerlink" href="#garbagecollector" title="Permalink to this headline">¶</a></h3>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">jvm.gc.&lt;gc_type&gt;.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">java.lang:type=GarbageCollector,name=&lt;gc_type&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 25%" />
 <col style="width: 14%" />
 <col style="width: 61%" />
 </colgroup>
 <thead>
 <tr class="row-odd"><th class="head"><p>Name</p></th>
 <th class="head"><p>Type</p></th>
 <th class="head"><p>Description</p></th>
 </tr>
 </thead>
 <tbody>
 <tr class="row-even"><td><p>Count</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Total number of collections that have occurred</p></td>
 </tr>
 <tr class="row-odd"><td><p>Time</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Approximate accumulated collection elapsed time in milliseconds</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="memory">
 <h3>Memory<a class="headerlink" href="#memory" title="Permalink to this headline">¶</a></h3>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">jvm.memory.&lt;heap/non-heap/total&gt;.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">java.lang:type=Memory</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 13%" />
 <col style="width: 64%" />
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p>Committed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of memory in bytes that is committed for the JVM to use</p></td>
 </tr>
 <tr class="row-even"><td><p>Init</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of memory in bytes that the JVM initially requests from the OS</p></td>
 </tr>
 <tr class="row-odd"><td><p>Max</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Maximum amount of memory in bytes that can be used for memory management</p></td>
 </tr>
 <tr class="row-even"><td><p>Usage</p></td>
 <td><p>Ratio</p></td>
 <td><p>Ratio of used to maximum memory</p></td>
 </tr>
 <tr class="row-odd"><td><p>Used</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of used memory in bytes</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 <div class="section" id="memorypool">
 <h3>MemoryPool<a class="headerlink" href="#memorypool" title="Permalink to this headline">¶</a></h3>
 <dl class="simple">
 <dt><strong>Metric Name</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">jvm.memory.pools.&lt;memory_pool&gt;.&lt;MetricName&gt;</span></code></p>
 </dd>
 <dt><strong>JMX MBean</strong></dt><dd><p><code class="docutils literal notranslate"><span class="pre">java.lang:type=MemoryPool,name=&lt;memory_pool&gt;</span></code></p>
 </dd>
 </dl>
 <table class="docutils align-default">
 <colgroup>
 <col style="width: 23%" />
 <col style="width: 13%" />
 <col style="width: 64%" />
 </colgroup>
 <tbody>
 <tr class="row-odd"><td><p>Committed</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of memory in bytes that is committed for the JVM to use</p></td>
 </tr>
 <tr class="row-even"><td><p>Init</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of memory in bytes that the JVM initially requests from the OS</p></td>
 </tr>
 <tr class="row-odd"><td><p>Max</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Maximum amount of memory in bytes that can be used for memory management</p></td>
 </tr>
 <tr class="row-even"><td><p>Usage</p></td>
 <td><p>Ratio</p></td>
 <td><p>Ratio of used to maximum memory</p></td>
 </tr>
 <tr class="row-odd"><td><p>Used</p></td>
 <td><p>Gauge&lt;Long&gt;</p></td>
 <td><p>Amount of used memory in bytes</p></td>
 </tr>
 </tbody>
 </table>
 </div>
 </div>
 <div class="section" id="jmx">
 <h2>JMX<a class="headerlink" href="#jmx" title="Permalink to this headline">¶</a></h2>
 <p>Any JMX based client can access metrics from cassandra.</p>
 <p>If you wish to access JMX metrics over http it’s possible to download <a class="reference external" href="http://mx4j.sourceforge.net/">Mx4jTool</a> and
 place <code class="docutils literal notranslate"><span class="pre">mx4j-tools.jar</span></code> into the classpath.  On startup you will see in the log:</p>
 <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>HttpAdaptor version 3.0.2 started on port 8081
 </pre></div>
 </div>
 <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 class="docutils literal notranslate"><span class="pre">conf/cassandra-env.sh</span></code> and uncomment:</p>
 <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>#MX4J_ADDRESS=&quot;-Dmx4jaddress=0.0.0.0&quot;

 #MX4J_PORT=&quot;-Dmx4jport=8081&quot;
 </pre></div>
 </div>
 </div>
 <div class="section" id="metric-reporters">
 <h2>Metric Reporters<a class="headerlink" href="#metric-reporters" title="Permalink to this headline">¶</a></h2>
 <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 class="reference external" href="http://metrics.dropwizard.io/3.1.0/getting-started/#other-reporting">built in</a> and <a class="reference external" href="http://metrics.dropwizard.io/3.1.0/manual/third-party/">third party</a> reporter plugins.</p>
 <p>The configuration of these plugins is managed by the <a class="reference external" href="https://github.com/addthis/metrics-reporter-config">metrics reporter config project</a>. There is a sample configuration file located at
 <code class="docutils literal notranslate"><span class="pre">conf/metrics-reporter-config-sample.yaml</span></code>.</p>
 <p>Once configured, you simply start cassandra with the flag
 <code class="docutils literal notranslate"><span class="pre">-Dcassandra.metricsReporterConfigFile=metrics-reporter-config.yaml</span></code>. The specified .yaml file plus any 3rd party
 reporter jars must all be in Cassandra’s classpath.</p>
 </div>
 </div>


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