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| <h1> |
| HBase Metrics |
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| <a href="#Introduction"> Introduction </a> |
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| |
| <a name="N1000D"></a><a name="Introduction"></a> |
| <h2 class="h3"> Introduction </h2> |
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| <p> |
| HBase emits Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>. |
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| |
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| <h2 class="h3">HOWTO</h2> |
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| <p>First read up on Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>. |
| If you are using ganglia, the <a href="http://wiki.apache.org/hadoop/GangliaMetrics">GangliaMetrics</a> |
| wiki page is useful read.</p> |
| <p>To have HBase emit metrics, edit <span class="codefrag">$HBASE_HOME/conf/hadoop-metrics.properties</span> |
| and enable metric 'contexts' per plugin. As of this writing, hadoop supports |
| <strong>file</strong> and <strong>ganglia</strong> plugins. |
| Yes, the hbase metrics files is named hadoop-metrics rather than |
| <em>hbase-metrics</em> because currently at least the hadoop metrics system has the |
| properties filename hardcoded. Per metrics <em>context</em>, |
| comment out the NullContext and enable one or more plugins instead. |
| </p> |
| <p> |
| If you enable the <em>hbase</em> context, on regionservers you'll see total requests since last |
| metric emission, count of regions and storefiles as well as a count of memcache size. |
| On the master, you'll see a count of the cluster's requests. |
| </p> |
| <p> |
| Enabling the <em>rpc</em> context is good if you are interested in seeing |
| metrics on each hbase rpc method invocation (counts and time taken). |
| </p> |
| <p> |
| The <em>jvm</em> context is |
| useful for long-term stats on running hbase jvms -- memory used, thread counts, etc. |
| As of this writing, if more than one jvm is running emitting metrics, at least |
| in ganglia, the stats are aggregated rather than reported per instance. |
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