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 <h1>
       HBase Metrics
     </h1>
 <div id="minitoc-area">
 <ul class="minitoc">
 <li>
 <a href="#Introduction"> Introduction </a>
 </li>
 <li>
 <a href="#HOWTO">HOWTO</a>
 </li>
 <li>
 <a href="#Using+with+JMX"> Using with JMX </a>
 <ul class="minitoc">
 <li>
 <a href="#Enable+HBase+stats+collection">Enable HBase stats collection</a>
 </li>
 <li>
 <a href="#Setup+JMX+remote+access">Setup JMX remote access</a>
 </li>
 <li>
 <a href="#Configure+JMX+in+HBase+startup">Configure JMX in HBase startup</a>
 </li>
 </ul>
 </li>
 </ul>
 </div>

 <a name="N1000D"></a><a name="Introduction"></a>
 <h2 class="h3"> Introduction </h2>
 <div class="section">
 <p>
       HBase emits Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>.
       </p>
 </div>

 <a name="N1001B"></a><a name="HOWTO"></a>
 <h2 class="h3">HOWTO</h2>
 <div class="section">
 <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 memstore 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.
       </p>
 </div>


 <a name="N10051"></a><a name="Using+with+JMX"></a>
 <h2 class="h3"> Using with JMX </h2>
 <div class="section">
 <p>
       In addition to the standard output contexts supported by the Hadoop
       metrics package, you can also export HBase metrics via Java Management
       Extensions (JMX).  This will allow viewing HBase stats in JConsole or
       any other JMX client.
       </p>
 <a name="N1005A"></a><a name="Enable+HBase+stats+collection"></a>
 <h3 class="h4">Enable HBase stats collection</h3>
 <p>
       To enable JMX support in HBase, first edit
       <span class="codefrag">$HBASE_HOME/conf/hadoop-metrics.properties</span> to support
       metrics refreshing. (If you've already configured
       <span class="codefrag">hadoop-metrics.properties</span> for another output context,
       you can skip this step).
       </p>
 <pre class="code">
 # Configuration of the "hbase" context for null
 hbase.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
 hbase.period=60

 # Configuration of the "jvm" context for null
 jvm.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
 jvm.period=60

 # Configuration of the "rpc" context for null
 rpc.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
 rpc.period=60
       </pre>
 <a name="N1006E"></a><a name="Setup+JMX+remote+access"></a>
 <h3 class="h4">Setup JMX remote access</h3>
 <p>
       For remote access, you will need to configure JMX remote passwords
       and access profiles.  Create the files:
       </p>
 <dl>

 <dt>
 <span class="codefrag">$HBASE_HOME/conf/jmxremote.passwd</span> (set permissions
         to 600)</dt>

 <dd>

 <pre class="code">
 monitorRole monitorpass
 controlRole controlpass
         </pre>

 </dd>


 <dt>
 <span class="codefrag">$HBASE_HOME/conf/jmxremote.access</span>
 </dt>

 <dd>

 <pre class="code">
 monitorRole readonly
 controlRole readwrite
         </pre>

 </dd>

 </dl>
 <a name="N10092"></a><a name="Configure+JMX+in+HBase+startup"></a>
 <h3 class="h4">Configure JMX in HBase startup</h3>
 <p>
       Finally, edit the <span class="codefrag">$HBASE_HOME/conf/hbase-env.sh</span>
       script to add JMX support:
       </p>
 <dl>

 <dt>
 <span class="codefrag">$HBASE_HOME/conf/hbase-env.sh</span>
 </dt>

 <dd>

 <p>Add the lines:</p>

 <pre class="code">
 HBASE_JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false"
 HBASE_JMX_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.password.file=$HBASE_HOME/conf/jmxremote.passwd"
 HBASE_JMX_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.access.file=$HBASE_HOME/conf/jmxremote.access"

 export HBASE_MASTER_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.port=10101"
 export HBASE_REGIONSERVER_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.port=10102"
         </pre>

 </dd>

 </dl>
 <p>
       After restarting the processes you want to monitor, you should now be
       able to run JConsole (included with the JDK since JDK 5.0) to view
       the statistics via JMX.  HBase MBeans are exported under the
       <strong><span class="codefrag">hadoop</span></strong> domain in JMX.
       </p>
 </div>

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	<h1>
	HBase Metrics
	</h1>
	<div id="minitoc-area">
	<ul class="minitoc">
	<li>
	<a href="#Introduction"> Introduction </a>
	</li>
	<li>
	<a href="#HOWTO">HOWTO</a>
	</li>
	<li>
	<a href="#Using+with+JMX"> Using with JMX </a>
	<ul class="minitoc">
	<li>
	<a href="#Enable+HBase+stats+collection">Enable HBase stats collection</a>
	</li>
	<li>
	<a href="#Setup+JMX+remote+access">Setup JMX remote access</a>
	</li>
	<li>
	<a href="#Configure+JMX+in+HBase+startup">Configure JMX in HBase startup</a>
	</li>
	</ul>
	</li>
	</ul>
	</div>

	<a name="N1000D"></a><a name="Introduction"></a>
	<h2 class="h3"> Introduction </h2>
	<div class="section">
	<p>
	HBase emits Hadoop <a href="http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/metrics/package-summary.html">metrics</a>.
	</p>
	</div>

	<a name="N1001B"></a><a name="HOWTO"></a>
	<h2 class="h3">HOWTO</h2>
	<div class="section">
	<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 memstore 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.
	</p>
	</div>


	<a name="N10051"></a><a name="Using+with+JMX"></a>
	<h2 class="h3"> Using with JMX </h2>
	<div class="section">
	<p>
	In addition to the standard output contexts supported by the Hadoop
	metrics package, you can also export HBase metrics via Java Management
	Extensions (JMX). This will allow viewing HBase stats in JConsole or
	any other JMX client.
	</p>
	<a name="N1005A"></a><a name="Enable+HBase+stats+collection"></a>
	<h3 class="h4">Enable HBase stats collection</h3>
	<p>
	To enable JMX support in HBase, first edit
	<span class="codefrag">$HBASE_HOME/conf/hadoop-metrics.properties</span> to support
	metrics refreshing. (If you've already configured
	<span class="codefrag">hadoop-metrics.properties</span> for another output context,
	you can skip this step).
	</p>
	<pre class="code">
	# Configuration of the "hbase" context for null
	hbase.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
	hbase.period=60

	# Configuration of the "jvm" context for null
	jvm.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
	jvm.period=60

	# Configuration of the "rpc" context for null
	rpc.class=org.apache.hadoop.metrics.spi.NullContextWithUpdateThread
	rpc.period=60
	</pre>
	<a name="N1006E"></a><a name="Setup+JMX+remote+access"></a>
	<h3 class="h4">Setup JMX remote access</h3>
	<p>
	For remote access, you will need to configure JMX remote passwords
	and access profiles. Create the files:
	</p>
	<dl>

	<dt>
	<span class="codefrag">$HBASE_HOME/conf/jmxremote.passwd</span> (set permissions
	to 600)</dt>

	<dd>

	<pre class="code">
	monitorRole monitorpass
	controlRole controlpass
	</pre>

	</dd>


	<dt>
	<span class="codefrag">$HBASE_HOME/conf/jmxremote.access</span>
	</dt>

	<dd>

	<pre class="code">
	monitorRole readonly
	controlRole readwrite
	</pre>

	</dd>

	</dl>
	<a name="N10092"></a><a name="Configure+JMX+in+HBase+startup"></a>
	<h3 class="h4">Configure JMX in HBase startup</h3>
	<p>
	Finally, edit the <span class="codefrag">$HBASE_HOME/conf/hbase-env.sh</span>
	script to add JMX support:
	</p>
	<dl>

	<dt>
	<span class="codefrag">$HBASE_HOME/conf/hbase-env.sh</span>
	</dt>

	<dd>

	<p>Add the lines:</p>

	<pre class="code">
	HBASE_JMX_OPTS="-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false"
	HBASE_JMX_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.password.file=$HBASE_HOME/conf/jmxremote.passwd"
	HBASE_JMX_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.access.file=$HBASE_HOME/conf/jmxremote.access"

	export HBASE_MASTER_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.port=10101"
	export HBASE_REGIONSERVER_OPTS="$HBASE_JMX_OPTS -Dcom.sun.management.jmxremote.port=10102"
	</pre>

	</dd>

	</dl>
	<p>
	After restarting the processes you want to monitor, you should now be
	able to run JConsole (included with the JDK since JDK 5.0) to view
	the statistics via JMX. HBase MBeans are exported under the
	<strong><span class="codefrag">hadoop</span></strong> domain in JMX.
	</p>
	</div>

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