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408 lines
13 KiB
HTML
408 lines
13 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>Berkeley DB Java Edition MBeans and JConsole Plugin</title>
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</head>
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<body>
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<div class="docMain">
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<center>
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<h1>Monitoring and Debugging Berkeley DB Java Edition with JMX</h1>
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</center>
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<a href="#mbeans">Monitoring and Diagnostic MBeans</a><br>
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<a href="#jconsole">Displaying Statistics Graphically With the JE
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JConsole Plugin</a><br>
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<!-- MBEANS --------------------------------------------- -->
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<hr>
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<h2><a name="mbeans">Monitoring and Diagnostic MBeans</a></h2>
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<h3>Overview</h3>
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<p>
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Berkeley DB Java Edition provides monitoring and debugging support
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through four JMX Dynamic MBeans. JEMonitor and RepJEMonitor make JE
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statistics and basic administrative operations available, and are
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mainly used for monitoring a JE application. JEDiagnostics and
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RepJEDiagnostics makes JE logging output configurable dynamically, and
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are mainly used for debugging.
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</p>
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<p>
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A non-replicated (non-HA) JE Environment can only be accessed via
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JEMonitor and JEDiagnostics, while a replicated JE Environment can
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only be accessed via RepJEMonitor and RepJEDiagnostics.
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</p>
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<p>
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The functionality provided by the JE MBeans can be accessed through
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the standard MBean attribute/operation interface available through
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JConsole or another management console. In addition, environment
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statistics can be viewed and exported through the
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<a href="#jconsole">JE JConsole Plugin</a>
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<h3>Enabling MBeans in your JE Application</h3>
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<p>To register and enable the MBeans for a JE application, set the
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JEMonitor system property to true. For example:<br><br>
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<code>
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java -DJEMonitor=true -cp <je.jar> <JE application> </code>
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<p>
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Setting <code>-DJEMonitor=true</code> will register both the monitoring
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and diagnostic MBeans for the application. For example, a non-HA
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environment will register both JEMonitor and JEDiagnostics, while a
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a replicated environment will register both RepJEMonitor and RepJEDiagnostics.
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</p>
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<h3>Attributes and Operations available through JEMonitor and RepJEMonitor</h3>
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<p>
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JEMonitor monitors a non-replicated JE application. RepJEMonitor
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monitors a replicated JE application and provides all the attributes
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and operations of JEMonitor, along with additional operations only
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applicable for replicated environments.
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</p>
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<h4>Monitoring Attributes</h4>
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<p>
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JEMonitor and RepJEMonitor have the following attributes list:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img src="JEMonitor-attributes.JPG" alt="Monitor attributes"></td>
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</tr>
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</table>
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<br>
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<br>
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<p>
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Attributes names and values are listed in the area outlined in
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<font color="red"><b>red</b></font>. Most of the attributes are
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immutable and cannot be changed through JEMonitor, with the exception
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of <code>cachePercent</code> and <code>cacheSize</code>. Detailed
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information about the attributes can be obtained by clicking on the
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attribute name in the list outlined in
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<font color="blue"><b>blue</b></font>.
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</p>
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<h4>Monitoring Operations</h4>
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<p>
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JEMonitor provides the following operations, which can be invoked on
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the monitored, running JE application:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="Monitor operations" src="JEMonitor-operations.JPG"></td>
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</tr>
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</table>
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<br>
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<br>
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<p>
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These operations mimic functionality available through the
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com.sleepycat.je.Environment class. <code>getEnvConfig</code>
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and <code>getEnvironmentStats</code> are of particular value for
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obtaining information about the environment configuration, and current
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statistics. More information about each operation is available through
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a tool tip that displays when the mouse hovers over the operation button.
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<p>
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As stated above, RepJEMonitor provides two additional operations to monitor a
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replicated JE application:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="Monitor operations" src="RepJEMonitor-operations.JPG"></td>
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</tr>
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</table>
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<br>
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<br>
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<p>
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The additional operations are outlined
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in <font color="red"><b>red</b></font>.
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<code>getReplicationStats</code> displays replication specific
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statistics, while <code>dumpReplicationState</code> displays
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information about the replication group composition, current node
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state, etc.
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<h3>JEDiagnostics and RepJEDiagnostics</h3>
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<p>
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JEDiagnostics and RepJEDiagnostics, currently have the same attributes
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and operations list.
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</p>
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<h4>Diagnostic Attributes</h4>
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<p>
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JEDiagnostics and RepJEDiagnostics attribute are:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="Diagnostic attributes" src="JEDiagnostics-attributes.JPG"></td>
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</tr>
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</table>
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<br>
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<br>
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<p>
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Attributes names and values are listed in the area outlined in
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<font color="red"><b>red</b></font>. These attributes manage the
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output levels for ConsoleHandler, FileHandler and MemoryHandler and
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let you change logging output for a running JE application. This is
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useful when doing detailed debugging, as described
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in <a href="../GettingStartedGuide/managelogging.html">Chapter 12 of
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the Getting Started Guide.</a> Detailed information for each
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attribute is listed in the
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<font color="blue"><b>blue</b></font> area and can be displayed by
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clicking on the attribute.
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</p>
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<h4>Diagnostic Operations</h4>
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<p>
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JEDiagnostics and RepJEDiagnostics currently support the same operations:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="Diagnostic operations" src="JEDiagnostics-operations.JPG"></td>
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</tr>
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</table>
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<br>
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<br>
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</p>
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<p>
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<code>resetLoggerLevel</code> allows you reset the level for a JE
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logger, while
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<code>pushMemoryHandler</code> lets you flush any logging output which
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has been buffered in memory. Both are used only in debugging situations.
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</p>
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<br>
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<br>
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<!-- JConsole --------------------------------------------- -->
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<hr>
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<h2><a name="jconsole">Berkeley DB Java Edition JConsole Plugin</a></h2>
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<h3><a name="overview">Overview</a></h3>
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<p>
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The BDB JE JConsole plugins let you monitor and graphically display
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information from running JE applications using
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the <code>jconsole</code> utility which is distributed with the
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JDK. Two plugins jars are provided: one for monitoring non-HA JE
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applications (<code>JE_HOME/lib/JEJConsole.jar</code>), and another
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for monitoring JE HA applications
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(<code>JE_HOME/lib/RepJEJConsole.jar</code>). The former
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lets <code>jconsole</code> monitor and display <code>
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EnvironmentStats</code> while the latter shows both
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<code>EnvironmentStats</code>
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and <code>ReplicatedEnvironmentStats</code>.
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</p>
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<p>
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The plugins can:
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<ul>
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<li> Display stats from a running JE application,
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<li> Optionally log those stats into a log file in csv format,
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<li> Graph those stats so that you can directly see the changes,
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</ul>
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</p>
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<p>
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The plugins are based on the JE MBeans described above and use the
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MBean operations to periodically obtain statistics which are displayed
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in a table or graph.
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<code>JEJConsole</code> invokes
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<code>JEMonitor.getEnvironmentStats</code>
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while <code>RepJEJConsole</code> invokes
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both <code>RepJEMonitor.getEnvironmentStats</code> and
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<code>RepJEMonitor.getReplicationStats</code>.
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Note that <code>JEJConsole</code> can be used to monitor both JE
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non-replicated and replicated applications, but in the latter case
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will not display the "JE Replicated Statistics" tab shown in the
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second screen shot below.
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</p>
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<p>
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See the javadoc
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for <a
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href="../java/com/sleepycat/je/EnvironmentStats.html">EnvironmentStats</a>
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and <a
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href="../java/com/sleepycat/je/rep/ReplicatedEnvironmentStats.html">ReplicatedEnvironmentStats</a>
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for more information about the meaning of the statistics.
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</p>
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<p>
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<br>
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A screenshot of the <code>JEJConsole</code> plugin:
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<br>
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="JEStats" src="JEStats-plugin.JPG"></td>
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</tr>
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</table>
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<br>
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<br>
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The <code>RepJEJConsole</code> plugin:
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<br>
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<table width="100%">
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<tr>
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<td align="center"><img alt="RepJEStats" src="RepJEStats-plugin.JPG"></td>
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</tr>
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</table>
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</p>
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<h3>Using The Plugins</h3>
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<p>
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<code>jconsole</code> can only monitor applications that have
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registered a <code>DynamicMBean</code>.
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Both JE and JE HA will automatically register an appropriate
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<code>DynamicMBean</code> when an <code>Environment</code> or
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<code>ReplicatedEnvironment</code> is created, if the <code>JEMonitor</code>
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system property is set to true (e.g. using <code>-DJEMonitor=true</code>
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on the command line).
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<p>
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To use the JE and JE Replication plugins, invoke <code>jconsole</code>
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with the <code>-pluginpath</code> option to specify one of the libraries.
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For example:
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<br><br>
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<code>jconsole -pluginpath JE_HOME/lib/JEJConsole.jar</code><br><br>
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or
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<br><br>
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<code>jconsole -pluginpath JE_HOME/lib/RepJEJConsole.jar</code><br><br>
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</p>
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<p>
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When the plugin starts up, a menu will appear which lets you choose
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the process to monitor. Your JE application should appear if you have
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set -DJEMonitor=true.
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<p>
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Note: There is a <a href="http://java.sun.com/performance/jvmstat/faq.html#4">known problem</a> with discovering Java
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processes on Windows platforms when the temporary directory is on a
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FAT type file system. In that case, a Java application may need to
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set -XX:+PerfBypassFileSystemCheck on the Java command line in order
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for the process to appear on the connection menu.
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<p> After connecting to the process, a <code>"JE Statistics"</code> tab will
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be shown in <code>jconsole</code>. The tab will be named <code>"JE
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Replicated Statistics"</code> when using the
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<code>RepJEJConsole.jar</code> plugin. The tab provides various
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options:
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</p>
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<ul>
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<li>
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<i>Choose JE MBean</i>
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<p>
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A JE application may have more than one <code>Environment</code>, and
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therefore multiple <code>DynamicMBeans</code>. The plugin lets you
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select which <code>Environment</code> you want to look at with
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the <code>"Choose JE MBean"</code> box:
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<br><br>
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<div align="center"><img alt="Choose MBean" src="Choose-MBean.JPG"></div>
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</p>
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</li>
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<li>
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<i>Set Collection Interval</i>
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<p>
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The default interval for collecting environment stats is 10 seconds.
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You can change this by entering a new value in the
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<code>"Collection interval (secs):"</code> field and then pressing the
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Enter key:
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<br><br>
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<div align="center"><img alt="Graph" src="Interval-setting.JPG"></div>
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</p>
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</li>
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<li>
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<i>Display cumulative stats</i>
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<p>
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By default, statistics are reset after each collection period, and the
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value displayed pertains only to the collection interval. For example,
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if the collection interval is 10 seconds, the plugin will display
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values for the first 10 seconds, the second 10 seconds, etc. You may
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choose instead to display statistics in a cumulative way, so that the
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displayed values accumulate as the application runs, instead of
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resetting in each interval. To do so, click the
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<code>"Display cumulative stats"</code> checkbox:
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<br><br>
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<div align="center"><img alt="Clear stats" src="Display-cumulative-stats.JPG"></div>
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</p>
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</li>
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<li>
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<i>Limit the Display to Non-Zero values</i>
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<p>
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JE provides numerous stats. Depending on your application, some of
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them may be 0 and therefore irrelevant for analyzing performance. You
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can hide these stats by clicking the <code>"Hide zero values"</code> checkbox:
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<br><br>
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<div align="center"><img alt="Non-zero" src="Non-zero.JPG"></div>
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</p>
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</li>
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<li>
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<i>Choose a File for Logging Stats</i>
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<p>
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You may specify the file to write selected stats to with
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the <code>"Record Statistics To..."</code> button. Currently, only
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CSV format is supported:
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<br><br>
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<div align="center"><img alt="save log" src="Save-log.JPG"></div>
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</p>
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</li>
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<li>
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<i>Start Recording</i>
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<p>
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You can begin recording stats to the selected file by pressing
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the <code>"Start Recording"</code> button. While recording is enabled,
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you can not change the recording interval, log file, or the specific
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stats being logged:<br><br>
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<div align="center"><img alt="start recording" src="Start-record.JPG"></div>
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</p>
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</li>
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<li>
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<i>Stop Recording</i>
|
||
|
|
<p>
|
||
|
|
You can stop recording stats by pressing the <code>"Stop
|
||
|
|
Recording"</code> button. You can only change the recording interval,
|
||
|
|
log file, or the specific stats being logged when recording is
|
||
|
|
stopped:
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="stop recording" src="Stop-record.JPG"></div>
|
||
|
|
</p>
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
<i>Choose Stats Group to Display</i>
|
||
|
|
<p>
|
||
|
|
JE Environment stats are divided into several groups. You can specify
|
||
|
|
which groups to display by checking the appropriate groups:
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="choose group" src="Choose-group.JPG"></div>
|
||
|
|
</p>
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
<i>Stop Logging a Stat</i>
|
||
|
|
<p>
|
||
|
|
All stats are logged by default. If you don't want to log a particular
|
||
|
|
stat, you can right click on that stat, and uncheck <code>"Log This
|
||
|
|
Stat"</code>:
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="unlog" src="Unlog-stat.JPG"></div>
|
||
|
|
</p>
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
<i>Graph a Stat</i>
|
||
|
|
<p>
|
||
|
|
You may graph a particular stat by right clicking on the stat and
|
||
|
|
selecting <code>"Graph This Stat"</code>. For example if you right-click
|
||
|
|
on <code>nMarkLNsProcessed</code> and select <code>Graph This Stat</code>...
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="graph" src="Graph-stat.JPG"></div><br><br>
|
||
|
|
... then a new window with the dynamic graph will be displayed:
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="show graph" src="Show-graph.JPG"></div>
|
||
|
|
</p>
|
||
|
|
</li>
|
||
|
|
<li>
|
||
|
|
<i>Show tips</i>
|
||
|
|
<p>
|
||
|
|
Each stat has a mouse-over which describes its meaning. For example:
|
||
|
|
<br><br>
|
||
|
|
<div align="center"><img alt="show tips" src="Show-tips.JPG"></div>
|
||
|
|
</p>
|
||
|
|
</li>
|
||
|
|
</ul>
|
||
|
|
<p>
|
||
|
|
Please report bugs to the <a href="http://forums.oracle.com/forums/forum.jspa?forumID=273">Berkeley DB Java Edition OTN forum</a>.
|
||
|
|
</p>
|
||
|
|
</div></html>
|