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Posted to commits@zookeeper.apache.org by bu...@apache.org on 2011/04/05 04:48:27 UTC
svn commit: r787995 [38/39] - in
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api/org/apache/zookeeper/class-use/ api/org/apache/zookeeper/data/
api/org/apache/zookeeper/data/class-us...
Added: websites/staging/zookeeper/trunk/content/doc/current/zookeeperQuotas.html
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--- websites/staging/zookeeper/trunk/content/doc/current/zookeeperQuotas.html (added)
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+ PDF</a>
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+<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>
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+
+
+
+
+<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>
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+
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+<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 &
+ 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>
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