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Subject svn commit: r786254 [15/16] - in /websites/staging/zookeeper/trunk/content: ./ doc/r3.3.3/ doc/r3.3.3/images/ doc/r3.3.3/skin/ doc/r3.3.3/skin/images/
Date Mon, 28 Feb 2011 23:22:00 GMT
Added: websites/staging/zookeeper/trunk/content/doc/r3.3.3/zookeeperQuotas.html
==============================================================================
--- websites/staging/zookeeper/trunk/content/doc/r3.3.3/zookeeperQuotas.html (added)
+++ websites/staging/zookeeper/trunk/content/doc/r3.3.3/zookeeperQuotas.html Mon Feb 28 23:21:57 2011
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+        PDF</a>
+</div>
+<h1>ZooKeeper Quota's Guide</h1>
+<h3>A Guide to Deployment and Administration</h3>
+<div id="minitoc-area">
+<ul class="minitoc">
+<li>
+<a href="#zookeeper_quotas">Quotas</a>
+<ul class="minitoc">
+<li>
+<a href="#Setting+Quotas">Setting Quotas</a>
+</li>
+<li>
+<a href="#Listing+Quotas">Listing Quotas</a>
+</li>
+<li>
+<a href="#Deleting+Quotas"> Deleting Quotas</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+	
+	
+	
+	
+<a name="N1000B"></a><a name="zookeeper_quotas"></a>
+<h2 class="h3">Quotas</h2>
+<div class="section">
+<p> ZooKeeper has both namespace and bytes quotas. You can use the ZooKeeperMain class to setup quotas.
+	ZooKeeper prints <em>WARN</em> messages if users exceed the quota assigned to them. The messages 
+	are printed in the log of the ZooKeeper. 
+	</p>
+<p>
+<span class="codefrag computeroutput">$java -cp zookeeper.jar:src/java/lib/log4j-1.2.15.jar/conf:src/java/lib/jline-0.9.94.jar \
+	 org.apache.zookeeper.ZooKeeperMain -server host:port</span>
+</p>
+<p> The above command gives you a command line option of using quotas.</p>
+<a name="N1001F"></a><a name="Setting+Quotas"></a>
+<h3 class="h4">Setting Quotas</h3>
+<p>You can use 
+	 <em>setquota</em> to set a quota on a ZooKeeper node. It has an option of setting quota with
+	  -n (for namespace)
+	 and -b (for bytes). </p>
+<p> The ZooKeeper quota are stored in ZooKeeper itself in /zookeeper/quota. To disable other people from
+	changing the quota's set the ACL for /zookeeper/quota such that only admins are able to read and write to it.
+	</p>
+<a name="N1002F"></a><a name="Listing+Quotas"></a>
+<h3 class="h4">Listing Quotas</h3>
+<p> You can use
+	<em>listquota</em> to list a quota on a ZooKeeper node.
+	</p>
+<a name="N1003C"></a><a name="Deleting+Quotas"></a>
+<h3 class="h4"> Deleting Quotas</h3>
+<p> You can use
+	<em>delquota</em> to delete quota on a ZooKeeper node.
+	</p>
+</div>
+	
+<p align="right">
+<font size="-2"></font>
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+        PDF</a>
+</div>
+<h1>ZooKeeper Getting Started Guide</h1>
+<div id="minitoc-area">
+<ul class="minitoc">
+<li>
+<a href="#ch_GettingStarted">Getting Started: Coordinating Distributed Applications with
+      ZooKeeper</a>
+<ul class="minitoc">
+<li>
+<a href="#sc_Prerequisites">Pre-requisites</a>
+</li>
+<li>
+<a href="#sc_Download">Download</a>
+</li>
+<li>
+<a href="#sc_InstallingSingleMode">Standalone Operation</a>
+</li>
+<li>
+<a href="#sc_FileManagement">Managing ZooKeeper Storage</a>
+</li>
+<li>
+<a href="#sc_ConnectingToZooKeeper">Connecting to ZooKeeper</a>
+</li>
+<li>
+<a href="#sc_ProgrammingToZooKeeper">Programming to ZooKeeper</a>
+</li>
+<li>
+<a href="#sc_RunningReplicatedZooKeeper">Running Replicated ZooKeeper</a>
+</li>
+<li>
+<a href="#Other+Optimizations">Other Optimizations</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+  
+
+  
+
+  
+<a name="N10009"></a><a name="ch_GettingStarted"></a>
+<h2 class="h3">Getting Started: Coordinating Distributed Applications with
+      ZooKeeper</h2>
+<div class="section">
+<p>This document contains information to get you started quickly with
+    ZooKeeper. It is aimed primarily at developers hoping to try it out, and
+    contains simple installation instructions for a single ZooKeeper server, a
+    few commands to verify that it is running, and a simple programming
+    example. Finally, as a convenience, there are a few sections regarding
+    more complicated installations, for example running replicated
+    deployments, and optimizing the transaction log. However for the complete
+    instructions for commercial deployments, please refer to the <a href="zookeeperAdmin.html">ZooKeeper
+    Administrator's Guide</a>.</p>
+<a name="N10016"></a><a name="sc_Prerequisites"></a>
+<h3 class="h4">Pre-requisites</h3>
+<p>See <a href="zookeeperAdmin.html#sc_systemReq">
+          System Requirements</a> in the Admin guide.</p>
+<a name="N10024"></a><a name="sc_Download"></a>
+<h3 class="h4">Download</h3>
+<p>To get a ZooKeeper distribution, download a recent
+        <a href="http://hadoop.apache.org/zookeeper/releases.html">
+          stable</a> release from one of the Apache Download
+        Mirrors.</p>
+<a name="N10032"></a><a name="sc_InstallingSingleMode"></a>
+<h3 class="h4">Standalone Operation</h3>
+<p>Setting up a ZooKeeper server in standalone mode is
+      straightforward. The server is contained in a single JAR file,
+      so installation consists of creating a configuration.</p>
+<p>Once you've downloaded a stable ZooKeeper release unpack
+      it and cd to the root</p>
+<p>To start ZooKeeper you need a configuration file. Here is a sample,
+      create it in <strong>conf/zoo.cfg</strong>:</p>
+<pre class="code">
+tickTime=2000
+dataDir=/var/zookeeper
+clientPort=2181
+</pre>
+<p>This file can be called anything, but for the sake of this
+      discussion call
+      it <strong>conf/zoo.cfg</strong>. Change the
+      value of <strong>dataDir</strong> to specify an
+      existing (empty to start with) directory.  Here are the meanings
+      for each of the fields:</p>
+<dl>
+        
+<dt>
+<term>
+<strong>tickTime</strong>
+</term>
+</dt>
+<dd>
+<p>the basic time unit in milliseconds used by ZooKeeper. It is
+            used to do heartbeats and the minimum session timeout will be
+            twice the tickTime.</p>
+</dd>
+      
+</dl>
+<dl>
+        
+<dt>
+<term>
+<strong>dataDir</strong>
+</term>
+</dt>
+<dd>
+<p>the location to store the in-memory database snapshots and,
+            unless specified otherwise, the transaction log of updates to the
+            database.</p>
+</dd>
+
+        
+<dt>
+<term>
+<strong>clientPort</strong>
+</term>
+</dt>
+<dd>
+<p>the port to listen for client connections</p>
+</dd>
+      
+</dl>
+<p>Now that you created the configuration file, you can start
+      ZooKeeper:</p>
+<pre class="code">bin/zkServer.sh start</pre>
+<p>ZooKeeper logs messages using log4j -- more detail
+      available in the
+      <a href="zookeeperProgrammers.html#Logging">Logging</a>
+      section of the Programmer's Guide. You will see log messages
+      coming to the console (default) and/or a log file depending on
+      the log4j configuration.</p>
+<p>The steps outlined here run ZooKeeper in standalone mode. There is
+      no replication, so if ZooKeeper process fails, the service will go down.
+      This is fine for most development situations, but to run ZooKeeper in
+      replicated mode, please see <a href="#sc_RunningReplicatedZooKeeper">Running Replicated
+      ZooKeeper</a>.</p>
+<a name="N10083"></a><a name="sc_FileManagement"></a>
+<h3 class="h4">Managing ZooKeeper Storage</h3>
+<p>For long running production systems ZooKeeper storage must
+      be managed externally (dataDir and logs). See the section on
+      <a href="zookeeperAdmin.html#sc_maintenance">maintenance</a> for
+      more details.</p>
+<a name="N10091"></a><a name="sc_ConnectingToZooKeeper"></a>
+<h3 class="h4">Connecting to ZooKeeper</h3>
+<p>Once ZooKeeper is running, you have several options for connection
+      to it:</p>
+<ul>
+        
+<li>
+          
+<p>
+<strong>Java</strong>: Use</p>
+
+          
+<pre class="code">bin/zkCli.sh -server 127.0.0.1:2181</pre>
+
+          
+<p>This lets you perform simple, file-like operations.</p>
+        
+</li>
+
+        
+<li>
+          
+<p>
+<strong>C</strong>: compile cli_mt
+          (multi-threaded) or cli_st (single-threaded) by running
+          <span class="codefrag command">make cli_mt</span> or <span class="codefrag command">make
+          cli_st</span> in
+          the <strong>src/c</strong> subdirectory in
+          the ZooKeeper sources. See the README contained within
+          <strong>src/c</strong> for full details.</p>
+
+          
+<p>You can run the program
+          from <strong>src/c</strong> using:</p>
+
+          
+<pre class="code">LD_LIBRARY_PATH=. cli_mt 127.0.0.1:2181</pre>
+
+          
+<p>or</p>
+
+          
+<pre class="code">LD_LIBRARY_PATH=. cli_st 127.0.0.1:2181</pre>
+          
+<p>This will give you a simple shell to execute file
+          system like operations on ZooKeeper.</p>
+        
+</li>
+      
+</ul>
+<p>Once you have connected, you should see something like:
+        </p>
+<pre class="code">
+
+Connecting to localhost:2181
+log4j:WARN No appenders could be found for logger (org.apache.zookeeper.ZooKeeper).
+log4j:WARN Please initialize the log4j system properly.
+Welcome to ZooKeeper!
+JLine support is enabled
+[zkshell: 0]
+        </pre>
+<p>
+        From the shell, type <span class="codefrag command">help</span> to get a listing of commands that can be executed from the client, as in:
+      </p>
+<pre class="code">
+
+[zkshell: 0] help
+ZooKeeper host:port cmd args
+        get path [watch]
+        ls path [watch]
+        set path data [version]
+        delquota [-n|-b] path
+        quit
+        printwatches on|off
+        createpath data acl
+        stat path [watch]
+        listquota path
+        history
+        setAcl path acl
+        getAcl path
+        sync path
+        redo cmdno
+        addauth scheme auth
+        delete path [version]
+        setquota -n|-b val path
+
+        </pre>
+<p>From here, you can try a few simple commands to get a feel for this simple command line interface.  First, start by issuing the list command, as
+      in <span class="codefrag command">ls</span>, yielding:
+      </p>
+<pre class="code">
+
+[zkshell: 8] ls /
+[zookeeper]
+        </pre>
+<p>Next, create a new znode by running <span class="codefrag command">create /zk_test my_data</span>. This creates a new znode and associates the string "my_data" with the node.
+      You should see:</p>
+<pre class="code">
+
+[zkshell: 9] create /zk_test my_data
+Created /zk_test
+      </pre>
+<p>  Issue another <span class="codefrag command">ls /</span> command to see what the directory looks like:
+        </p>
+<pre class="code">
+
+[zkshell: 11] ls /
+[zookeeper, zk_test]
+
+        </pre>
+<p>
+      Notice that the zk_test directory has now been created.
+      </p>
+<p>Next, verify that the data was associated with the znode by running the <span class="codefrag command">get</span> command, as in:
+      </p>
+<pre class="code">
+
+[zkshell: 12] get /zk_test
+my_data
+cZxid = 5
+ctime = Fri Jun 05 13:57:06 PDT 2009
+mZxid = 5
+mtime = Fri Jun 05 13:57:06 PDT 2009
+pZxid = 5
+cversion = 0
+dataVersion = 0
+aclVersion = 0
+ephemeralOwner = 0
+dataLength = 7
+numChildren = 0
+        </pre>
+<p>We can change the data associated with zk_test by issuing the <span class="codefrag command">set</span> command, as in:
+        </p>
+<pre class="code">
+
+[zkshell: 14] set /zk_test junk
+cZxid = 5
+ctime = Fri Jun 05 13:57:06 PDT 2009
+mZxid = 6
+mtime = Fri Jun 05 14:01:52 PDT 2009
+pZxid = 5
+cversion = 0
+dataVersion = 1
+aclVersion = 0
+ephemeralOwner = 0
+dataLength = 4
+numChildren = 0
+[zkshell: 15] get /zk_test
+junk
+cZxid = 5
+ctime = Fri Jun 05 13:57:06 PDT 2009
+mZxid = 6
+mtime = Fri Jun 05 14:01:52 PDT 2009
+pZxid = 5
+cversion = 0
+dataVersion = 1
+aclVersion = 0
+ephemeralOwner = 0
+dataLength = 4
+numChildren = 0
+      </pre>
+<p>
+       (Notice we did a <span class="codefrag command">get</span> after setting the data and it did, indeed, change.</p>
+<p>Finally, let's <span class="codefrag command">delete</span> the node by issuing:
+      </p>
+<pre class="code">
+
+[zkshell: 16] delete /zk_test
+[zkshell: 17] ls /
+[zookeeper]
+[zkshell: 18]
+</pre>
+<p>That's it for now.  To explore more, continue with the rest of this document and see the <a href="zookeeperProgrammers.html">Programmer's Guide</a>. </p>
+<a name="N10130"></a><a name="sc_ProgrammingToZooKeeper"></a>
+<h3 class="h4">Programming to ZooKeeper</h3>
+<p>ZooKeeper has a Java bindings and C bindings. They are
+      functionally equivalent. The C bindings exist in two variants: single
+      threaded and multi-threaded. These differ only in how the messaging loop
+      is done. For more information, see the <a href="zookeeperProgrammers.html#ch_programStructureWithExample">Programming
+      Examples in the ZooKeeper Programmer's Guide</a> for
+      sample code using of the different APIs.</p>
+<a name="N1013E"></a><a name="sc_RunningReplicatedZooKeeper"></a>
+<h3 class="h4">Running Replicated ZooKeeper</h3>
+<p>Running ZooKeeper in standalone mode is convenient for evaluation,
+      some development, and testing. But in production, you should run
+      ZooKeeper in replicated mode. A replicated group of servers in the same
+      application is called a <em>quorum</em>, and in replicated
+      mode, all servers in the quorum have copies of the same configuration
+      file. The file is similar to the one used in standalone mode, but with a
+      few differences. Here is an example:</p>
+<pre class="code">
+tickTime=2000
+dataDir=/var/zookeeper
+clientPort=2181
+initLimit=5
+syncLimit=2
+server.1=zoo1:2888:3888
+server.2=zoo2:2888:3888
+server.3=zoo3:2888:3888
+</pre>
+<p>The new entry, <strong>initLimit</strong> is
+      timeouts ZooKeeper uses to limit the length of time the ZooKeeper
+      servers in quorum have to connect to a leader. The entry <strong>syncLimit</strong> limits how far out of date a server can
+      be from a leader.</p>
+<p>With both of these timeouts, you specify the unit of time using
+      <strong>tickTime</strong>. In this example, the timeout
+      for initLimit is 5 ticks at 2000 milleseconds a tick, or 10
+      seconds.</p>
+<p>The entries of the form <em>server.X</em> list the
+      servers that make up the ZooKeeper service. When the server starts up,
+      it knows which server it is by looking for the file
+      <em>myid</em> in the data directory. That file has the 
+      contains the server number, in ASCII.</p>
+<p>Finally, note the two port numbers after each server
+       name: " 2888" and "3888". Peers use the former port to connect
+       to other peers. Such a connection is necessary so that peers
+       can communicate, for example, to agree upon the order of
+       updates. More specifically, a ZooKeeper server uses this port
+       to connect followers to the leader. When a new leader arises, a
+       follower opens a TCP connection to the leader using this
+       port. Because the default leader election also uses TCP, we
+       currently require another port for leader election. This is the
+       second port in the server entry.
+       </p>
+<div class="note">
+<div class="label">Note</div>
+<div class="content">
+        
+<p>If you want to test multiple servers on a single
+        machine, specify the servername
+        as <em>localhost</em> with unique quorum &amp;
+        leader election ports (i.e. 2888:3888, 2889:3889, 2890:3890 in
+        the example above) for each server.X in that server's config
+        file. Of course separate <em>dataDir</em>s and
+        distinct <em>clientPort</em>s are also necessary
+        (in the above replicated example, running on a
+        single <em>localhost</em>, you would still have
+        three config files).</p>
+      
+</div>
+</div>
+<a name="N1017B"></a><a name="Other+Optimizations"></a>
+<h3 class="h4">Other Optimizations</h3>
+<p>There are a couple of other configuration parameters that can
+      greatly increase performance:</p>
+<ul>
+        
+<li>
+          
+<p>To get low latencies on updates it is important to
+          have a dedicated transaction log directory. By default
+          transaction logs are put in the same directory as the data
+          snapshots and <em>myid</em> file. The dataLogDir
+          parameters indicates a different directory to use for the
+          transaction logs.</p>
+        
+</li>
+
+        
+<li>
+          
+<p>
+<em>[tbd: what is the other config param?]</em>
+</p>
+        
+</li>
+      
+</ul>
+</div>
+
+<p align="right">
+<font size="-2"></font>
+</p>
+</div>
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