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<h1>ZooKeeper JMX</h1>
<div id="front-matter">
<div id="minitoc-area">
<ul class="minitoc">
<li>
<a href="#ch_jmx">JMX</a>
</li>
<li>
<a href="#ch_starting">Starting ZooKeeper with JMX enabled</a>
</li>
<li>
<a href="#ch_console">Run a JMX console</a>
</li>
<li>
<a href="#ch_reference">ZooKeeper MBean Reference</a>
</li>
</ul>
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<a name="ch_jmx"></a>
<h2 class="h3">JMX</h2>
<div class="section">
<p>Apache ZooKeeper has extensive support for JMX, allowing you
to view and manage a ZooKeeper serving ensemble.</p>
<p>This document assumes that you have basic knowledge of
JMX. See <a href="http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/">
Sun JMX Technology</a> page to get started with JMX.
</p>
<p>See the <a href="http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html">
JMX Management Guide</a> for details on setting up local and
remote management of VM instances. By default the included
<em>zkServer.sh</em> supports only local management -
review the linked document to enable support for remote management
(beyond the scope of this document).
</p>
</div>
<a name="ch_starting"></a>
<h2 class="h3">Starting ZooKeeper with JMX enabled</h2>
<div class="section">
<p>The class
<em>org.apache.zookeeper.server.quorum.QuorumPeerMain</em>
will start a JMX manageable ZooKeeper server. This class
registers the proper MBeans during initalization to support JMX
monitoring and management of the
instance. See <em>bin/zkServer.sh</em> for one
example of starting ZooKeeper using QuorumPeerMain.</p>
</div>
<a name="ch_console"></a>
<h2 class="h3">Run a JMX console</h2>
<div class="section">
<p>There are a number of JMX consoles available which can connect
to the running server. For this example we will use Sun's
<em>jconsole</em>.</p>
<p>The Java JDK ships with a simple JMX console
named <a href="http://java.sun.com/developer/technicalArticles/J2SE/jconsole.html">jconsole</a>
which can be used to connect to ZooKeeper and inspect a running
server. Once you've started ZooKeeper using QuorumPeerMain
start <em>jconsole</em>, which typically resides in
<em>JDK_HOME/bin/jconsole</em>
</p>
<p>When the "new connection" window is displayed either connect
to local process (if jconsole started on same host as Server) or
use the remote process connection.</p>
<p>By default the "overview" tab for the VM is displayed (this
is a great way to get insight into the VM btw). Select
the "MBeans" tab.</p>
<p>You should now see <em>org.apache.ZooKeeperService</em>
on the left hand side. Expand this item and depending on how you've
started the server you will be able to monitor and manage various
service related features.</p>
<p>Also note that ZooKeeper will register log4j MBeans as
well. In the same section along the left hand side you will see
"log4j". Expand that to manage log4j through JMX. Of particular
interest is the ability to dynamically change the logging levels
used by editing the appender and root thresholds. Log4j MBean
registration can be disabled by passing
<em>-Dzookeeper.jmx.log4j.disable=true</em> to the JVM
when starting ZooKeeper.
</p>
</div>
<a name="ch_reference"></a>
<h2 class="h3">ZooKeeper MBean Reference</h2>
<div class="section">
<p>This table details JMX for a server participating in a
replicated ZooKeeper ensemble (ie not standalone). This is the
typical case for a production environment.</p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
<caption>MBeans, their names and description</caption>
<title>MBeans, their names and description</title>
<tr>
<th>MBean</th>
<th>MBean Object Name</th>
<th>Description</th>
</tr>
<tr>
<td>Quorum</td>
<td>ReplicatedServer_id<#></td>
<td>Represents the Quorum, or Ensemble - parent of all
cluster members. Note that the object name includes the
"myid" of the server (name suffix) that your JMX agent has
connected to.</td>
</tr>
<tr>
<td>LocalPeer|RemotePeer</td>
<td>replica.<#></td>
<td>Represents a local or remote peer (ie server
participating in the ensemble). Note that the object name
includes the "myid" of the server (name suffix).</td>
</tr>
<tr>
<td>LeaderElection</td>
<td>LeaderElection</td>
<td>Represents a ZooKeeper cluster leader election which is
in progress. Provides information about the election, such as
when it started.</td>
</tr>
<tr>
<td>Leader</td>
<td>Leader</td>
<td>Indicates that the parent replica is the leader and
provides attributes/operations for that server. Note that
Leader is a subclass of ZooKeeperServer, so it provides
all of the information normally associated with a
ZooKeeperServer node.</td>
</tr>
<tr>
<td>Follower</td>
<td>Follower</td>
<td>Indicates that the parent replica is a follower and
provides attributes/operations for that server. Note that
Follower is a subclass of ZooKeeperServer, so it provides
all of the information normally associated with a
ZooKeeperServer node.</td>
</tr>
<tr>
<td>DataTree</td>
<td>InMemoryDataTree</td>
<td>Statistics on the in memory znode database, also
operations to access finer (and more computationally
intensive) statistics on the data (such as ephemeral
count). InMemoryDataTrees are children of ZooKeeperServer
nodes.</td>
</tr>
<tr>
<td>ServerCnxn</td>
<td><session_id></td>
<td>Statistics on each client connection, also
operations on those connections (such as
termination). Note the object name is the session id of
the connection in hex form.</td>
</tr>
</table>
<p>This table details JMX for a standalone server. Typically
standalone is only used in development situations.</p>
<table class="ForrestTable" cellspacing="1" cellpadding="4">
<caption>MBeans, their names and description</caption>
<title>MBeans, their names and description</title>
<tr>
<th>MBean</th>
<th>MBean Object Name</th>
<th>Description</th>
</tr>
<tr>
<td>ZooKeeperServer</td>
<td>StandaloneServer_port<#></td>
<td>Statistics on the running server, also operations
to reset these attributes. Note that the object name
includes the client port of the server (name
suffix).</td>
</tr>
<tr>
<td>DataTree</td>
<td>InMemoryDataTree</td>
<td>Statistics on the in memory znode database, also
operations to access finer (and more computationally
intensive) statistics on the data (such as ephemeral
count).</td>
</tr>
<tr>
<td>ServerCnxn</td>
<td><session_id></td>
<td>Statistics on each client connection, also
operations on those connections (such as
termination). Note the object name is the session id of
the connection in hex form.</td>
</tr>
</table>
</div>
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