Google Git
Sign in
apache/distributedlog/refs/heads/gh-pages/./tutorials/basic-1.html
blob: ee7167846c6587f1e0a83cd3a1259dbe932ee1a9 [file]
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Write Records using Core Library &mdash; DistributedLog 1.0 documentation</title>
<link rel="stylesheet" href="../_static/override.css" type="text/css" />
<link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="../_static/bootstrap-3.1.0/css/bootstrap.min.css" type="text/css" />
<link rel="stylesheet" href="../_static/bootstrap-3.1.0/css/bootstrap-theme.min.css" type="text/css" />
<link rel="stylesheet" href="../_static/css/featherlight.min.css" type="text/css" />
<link rel="stylesheet" href="../_static/css/docbird.css" type="text/css" />
<link rel="stylesheet" href="../_static/css/docbird-xs.css" type="text/css" />
<link rel="stylesheet" href="../_static/css/jquery.rateyo.min.css" type="text/css" />
<link rel="stylesheet" href="../_static/css/selection-sharer.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '../',
VERSION: '1.0',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../_static/jquery.js"></script>
<script type="text/javascript" src="../_static/underscore.js"></script>
<script type="text/javascript" src="../_static/doctools.js"></script>
<script type="text/javascript" src="../_static/bootstrap-3.1.0/js/bootstrap.min.js"></script>
<script type="text/javascript" src="../_static/js/bootstrap-docbird.js"></script>
<script type="text/javascript" src="../_static/js/jquery-1.11.0.min.js"></script>
<script type="text/javascript" src="../_static/js/jquery-fix.js"></script>
<script type="text/javascript" src="../_static/js/featherlight.min.js"></script>
<script type="text/javascript" src="../_static/js/ifvisible.js"></script>
<script type="text/javascript" src="../_static/js/timeme.js"></script>
<script type="text/javascript" src="../_static/js/jquery.rateyo.min.js"></script>
<script type="text/javascript" src="../_static/js/js.cookie.js"></script>
<link rel="shortcut icon" href="../_static/docbird.ico"/>
<link rel="top" title="DistributedLog 1.0 documentation" href="../index.html" />
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge,chrome=1'>
<meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1'>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta property="docbird:project" content="DistributedLog" />
</head>
<body>
<div class="navbar navbar-default navbar-fixed-top" role="navigation">
<div class="container-fluid">
<div class="row db-header">
<div class="col-sm-3 col-md-3 col-lg-3 hidden-xs db-header-controls">
<a href="/" alt="Back to Docbird">
<div class="db-home-button">
<span class="glyphicon glyphicon-home"></span>
</div>
</a>
<form action="../search.html" method="get" class="db-searchbox-form">
<div class="form-group">
<input type="text" name="q" class="form-control db-searchbox-input" placeholder="Search DistributedLog" />
</div>
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
<div class="col-sm-7 col-md-7 col-lg-7 col-xs-12 db-header-info">
<div class="visible-xs">
<a href="/" alt="Back to Docbird">
<div class="db-home-button">
<span class="glyphicon glyphicon-home"></span>
</div>
</a>
</div>
<div class="visible-xs db-xs-menu-button">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#db-xs-menu">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
</div>
<div class="db-header-projectname">
<h1><a href="../index.html">DistributedLog</a></h1>
</div>
</div>
</div>
<div class="row db-xs-menu hidden-sm hidden-md hidden-lg
collapse" id="db-xs-menu">
<form action="../search.html" method="get" class="db-searchbox-form">
<div class="form-group">
<input type="text" name="q" class="form-control db-searchbox-input" placeholder="Search DistributedLog" />
</div>
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
<div class="db-toc" role="complementary">
<ul>
<li class="toctree-l1"><a class="reference internal" href="../download.html">Releases</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../download.html#rc1">0.3.51-RC1</a></li>
<li class="toctree-l2"><a class="reference internal" href="../download.html#rc0">0.3.51-RC0</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../basics/main.html">Getting Started</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../basics/introduction.html">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="../basics/quickstart.html">Quick Start</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../api/main.html">API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../api/core.html">Core Library API</a></li>
<li class="toctree-l2"><a class="reference internal" href="../api/proxy.html">Write Proxy Client API</a></li>
<li class="toctree-l2"><a class="reference internal" href="../api/practice.html">Best Practices</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../configuration/main.html">Configuration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../configuration/core.html">Core Library Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/proxy.html">Write Proxy Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/client.html">Client Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/perlog.html">Per Stream Configuration</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../considerations/main.html">Considerations</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#consistency-durability-and-ordering">Consistency, Durability and Ordering</a></li>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#partitioning">Partitioning</a></li>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#processing-semantics">Processing Semantics</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../architecture/main.html">Architecture</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#data-model">Data Model</a></li>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#software-stack">Software Stack</a></li>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#lifecyle-of-records">Lifecyle of records</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../design/main.html">Detail Design</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#consistency">Consistency</a></li>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#streaming-reads">Streaming Reads</a></li>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#logsegment-lifecycle">LogSegment Lifecycle</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../globalreplicatedlog/main.html">Global Replicated Log</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#region-aware-data-placement-policy">Region Aware Data Placement Policy</a></li>
<li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#cross-region-speculative-reads">Cross Region Speculative Reads</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../implementation/main.html">Implementation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../implementation/storage.html">Storage</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../operations/main.html">Deployment &amp; Administration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../operations/deployment.html">Cluster Setup &amp; Deployment</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/operations.html">DistributedLog Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/performance.html">Performance Tuning</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/hardware.html">Hardware</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/monitoring.html">Monitoring</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/zookeeper.html">ZooKeeper</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/bookkeeper.html">BookKeeper</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../performance/main.html">Performance</a></li>
<li class="toctree-l1"><a class="reference internal" href="../references/main.html">References</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../references/configuration.html">Configuration Settings</a></li>
<li class="toctree-l2"><a class="reference internal" href="../references/metrics.html">Metrics</a></li>
<li class="toctree-l2"><a class="reference internal" href="../references/features.html">Features</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="main.html">Tutorials</a><ul>
<li class="toctree-l2"><a class="reference internal" href="main.html#basic">Basic</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#messaging">Messaging</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#replicated-state-machines">Replicated State Machines</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#analytics">Analytics</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../developer/main.html">Developer</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../developer/release.html">Release</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li>
</ul>
</div>
</div>
</div>
</div>
<div class="container">
<div class="row">
<div style="z-index: 1" class="col-xs-12 col-sm-12 col-md-12 col-lg-12">
<style>
.overflow-container {
display: none;
}
.overflow-toggle {
text-decoration: none;
border-bottom: none;
border-radius: 4px;
border: 1px solid #eee;
padding: 1px 3px 3px;
color: #888;
font-weight: normal;
background-color: linen;
line-height: 1.85em;
cursor: pointer;
}
.overflow-toggle:hover {
color: #333;
border-color: #ccc;
background-color: beige;
}
</style>
<script>
$(function(){
$('.overflow-toggle').on('click', function(){
$(this).next().toggle();
});
});
</script>
<div class="db-project-header-container">
<div class="row">
<div class="db-project-info col-lg-12 col-md-12 col-sm-12 col-xs-12">
<h1>
<a href="../index.html">DistributedLog</a>
</h1>
<div class="db-code-link">
<a href="git@github.com:twitter/distributedlog.git/tree/master/" target="_blank">git@github.com:twitter/distributedlog.git/tree/master/</a>
</div>
</div>
</div>
<div class="row db-project-links-row">
<div class=" col-sm-3 col-md-3 col-lg-3 db-project-link-column">
<div class="db-hashtag-container">
<span class="db-project-link-label">OWNERS</span>
<em>None</em>
</div>
</div>
<div class="col-sm-3 col-md-3 col-lg-3 db-project-link-column">
<div class="db-hashtag-container">
<span class="db-project-link-label">TAGS</span>
<em><a class="db-hashtag" href="/?q=tags:%23uses_maven">#uses_maven</a></em>
</div>
</div>
<div class="col-sm-3 col-md-3 col-lg-3 db-project-link-column">
<span class="db-project-link-label">HEALTH</span>
<h3 style="margin-top: 0">
<!-- <a href="/techdocs/checklist.html" class="label label-success">-->
<a href="/report/distributedlog" class="">
9.0 / 10
<span style="margin-left: .25em" class="glyphicon glyphicon-ok"></span>
</a>
</h3>
</div>
<div class="col-sm-3 col-md-3 col-lg-3 db-project-link-column">
<span class="db-project-link-label">RATING</span>
<div id="rateYo"></div>
</div>
</div>
</div>
</div>
<div class="col-xs-12 col-sm-8 col-md-8 col-lg-8">
<div class="db-content-body">
<div class="section" id="write-records-using-core-library">
<h1>Write Records using Core Library<a class="headerlink" href="#write-records-using-core-library" title="Permalink to this headline">¶</a></h1>
<p>This tutorial shows how to write records using core library.</p>
<div class="section" id="open-a-writer">
<h2>Open a writer<a class="headerlink" href="#open-a-writer" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Create distributedlog URI.</p>
<div class="highlight-python"><pre>String dlUriStr = ...;
URI uri = URI.create(dlUriStr);</pre>
<div style='display:none;' class='raw-code'><pre>String dlUriStr = ...;
URI uri = URI.create(dlUriStr);</pre>
</div></div>
</li>
<li><p class="first">Create distributedlog configuration.</p>
<div class="highlight-python"><pre>DistributedLogConfiguration conf = new DistributedLogConfiguration();</pre>
<div style='display:none;' class='raw-code'><pre>DistributedLogConfiguration conf = new DistributedLogConfiguration();</pre>
</div></div>
</li>
<li><p class="first">Enable immediate flush.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">conf</span><span class="o">.</span><span class="n">setImmediateFlushEnabled</span><span class="p">(</span><span class="n">true</span><span class="p">);</span>
<span class="n">conf</span><span class="o">.</span><span class="n">setOutputBufferSize</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
<span class="n">conf</span><span class="o">.</span><span class="n">setPeriodicFlushFrequencyMilliSeconds</span><span class="p">(</span><span class="mi">0</span><span class="p">);</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>conf.setImmediateFlushEnabled(true);
conf.setOutputBufferSize(0);
conf.setPeriodicFlushFrequencyMilliSeconds(0);</pre>
</div></div>
</li>
<li><p class="first">Enable immediate locking. So if there is already a writer wring to
the stream, opening another writer will fail because previous writer
already held a lock.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">conf</span><span class="o">.</span><span class="n">setLockTimeout</span><span class="p">(</span><span class="n">DistributedLogConstants</span><span class="o">.</span><span class="n">LOCK_IMMEDIATE</span><span class="p">);</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>conf.setLockTimeout(DistributedLogConstants.LOCK_IMMEDIATE);</pre>
</div></div>
</li>
<li><p class="first">Build the distributedlog namespace.</p>
<div class="highlight-python"><pre>DistributedLogNamespace namespace = DistributedLogNamespaceBuilder.newBuilder()
.conf(conf)
.uri(uri)
.regionId(DistributedLogConstants.LOCAL_REGION_ID)
.clientId("console-writer")
.build();</pre>
<div style='display:none;' class='raw-code'><pre>DistributedLogNamespace namespace = DistributedLogNamespaceBuilder.newBuilder()
.conf(conf)
.uri(uri)
.regionId(DistributedLogConstants.LOCAL_REGION_ID)
.clientId("console-writer")
.build();</pre>
</div></div>
</li>
<li><p class="first">Open the writer.</p>
<div class="highlight-python"><pre>DistributedLogManager dlm = namespace.openLog("basic-stream-1");
AsyncLogWriter writer = FutureUtils.result(dlm.openAsyncLogWriter());</pre>
<div style='display:none;' class='raw-code'><pre>DistributedLogManager dlm = namespace.openLog("basic-stream-1");
AsyncLogWriter writer = FutureUtils.result(dlm.openAsyncLogWriter());</pre>
</div></div>
</li>
</ul>
</div>
<div class="section" id="write-records">
<h2>Write Records<a class="headerlink" href="#write-records" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Construct a log record using <tt class="docutils literal"><span class="pre">System.currentTimeMillis()</span></tt> as the
<tt class="docutils literal"><span class="pre">TransactionID</span></tt>.</p>
<div class="highlight-python"><pre>byte[] data = ...;
LogRecord record = new LogRecord(System.currentTimeMillis(), data);</pre>
<div style='display:none;' class='raw-code'><pre>byte[] data = ...;
LogRecord record = new LogRecord(System.currentTimeMillis(), data);</pre>
</div></div>
</li>
<li><p class="first">Write the log record.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">Future</span><span class="o">&lt;</span><span class="n">DLSN</span><span class="o">&gt;</span> <span class="n">writeFuture</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">record</span><span class="p">);</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>Future&lt;DLSN&gt; writeFuture = writer.write(record);</pre>
</div></div>
</li>
<li><p class="first">Register a future listener on write completion.</p>
<div class="highlight-python"><pre>writeFuture.addEventListener(new FutureEventListener&lt;DLSN&gt;() {
@Override
public void onFailure(Throwable cause) {
// executed when write failed.
}
@Override
public void onSuccess(DLSN value) {
// executed when write completed.
}
});</pre>
<div style='display:none;' class='raw-code'><pre>writeFuture.addEventListener(new FutureEventListener&lt;DLSN&gt;() {
@Override
public void onFailure(Throwable cause) {
// executed when write failed.
}
@Override
public void onSuccess(DLSN value) {
// executed when write completed.
}
});</pre>
</div></div>
</li>
</ul>
</div>
<div class="section" id="close-the-writer">
<h2>Close the writer<a class="headerlink" href="#close-the-writer" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Close the writer after usage.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">FutureUtils</span><span class="o">.</span><span class="n">result</span><span class="p">(</span><span class="n">writer</span><span class="o">.</span><span class="n">asyncClose</span><span class="p">());</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>FutureUtils.result(writer.asyncClose());</pre>
</div></div>
</li>
</ul>
</div>
<div class="section" id="usage">
<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Run the example in the following steps:</p>
<ol class="arabic">
<li><p class="first">Start the local bookkeeper cluster. After the bookkeeper cluster is
started, you could access it using distributedlog uri
<em>distributedlog://127.0.0.1:7000/messaging/distributedlog</em>.</p>
<div class="highlight-python"><pre>// dlog local ${zk-port}
./distributedlog-core/bin/dlog local 7000</pre>
<div style='display:none;' class='raw-code'><pre>// dlog local ${zk-port}
./distributedlog-core/bin/dlog local 7000</pre>
</div></div>
</li>
<li><p class="first">Create the stream under the distributedlog uri.</p>
<div class="highlight-python"><pre>// Create Stream `basic-stream-1`
// dlog tool create -u ${distributedlog-uri} -r ${stream-prefix} -e ${stream-regex}
./distributedlog-core/bin/dlog tool create -u distributedlog://127.0.0.1:7000/messaging/distributedlog -r basic-stream- -e 1</pre>
<div style='display:none;' class='raw-code'><pre>// Create Stream `basic-stream-1`
// dlog tool create -u ${distributedlog-uri} -r ${stream-prefix} -e ${stream-regex}
./distributedlog-core/bin/dlog tool create -u distributedlog://127.0.0.1:7000/messaging/distributedlog -r basic-stream- -e 1</pre>
</div></div>
</li>
<li><p class="first">Tailing the stream using <tt class="docutils literal"><span class="pre">TailReader</span></tt> to wait for new records.</p>
<div class="highlight-python"><pre>// Tailing Stream `basic-stream-1`
// runner run com.twitter.distributedlog.basic.TailReader ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.TailReader distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-1</pre>
<div style='display:none;' class='raw-code'><pre>// Tailing Stream `basic-stream-1`
// runner run com.twitter.distributedlog.basic.TailReader ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.TailReader distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-1</pre>
</div></div>
</li>
<li><p class="first">Run the example to write records to the stream in a console.</p>
<div class="highlight-python"><pre>// Write Records into Stream `basic-stream-1`
// runner run com.twitter.distributedlog.basic.ConsoleWriter ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.ConsoleWriter distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-1</pre>
<div style='display:none;' class='raw-code'><pre>// Write Records into Stream `basic-stream-1`
// runner run com.twitter.distributedlog.basic.ConsoleWriter ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.ConsoleWriter distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-1</pre>
</div></div>
</li>
<li><p class="first">Example output from <tt class="docutils literal"><span class="pre">ConsoleWriter</span></tt> and <tt class="docutils literal"><span class="pre">TailReader</span></tt>.</p>
<div class="highlight-python"><pre>// Output of `ConsoleWriter`
Opening log stream basic-stream-1
[dlog] &gt; test!
[dlog] &gt;
// Output of `TailReader`
Opening log stream basic-stream-1
Log stream basic-stream-1 is empty.
Wait for records starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
"""
test!
"""</pre>
<div style='display:none;' class='raw-code'><pre>// Output of `ConsoleWriter`
Opening log stream basic-stream-1
[dlog] &gt; test!
[dlog] &gt;
// Output of `TailReader`
Opening log stream basic-stream-1
Log stream basic-stream-1 is empty.
Wait for records starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
"""
test!
"""</pre>
</div></div>
</li>
<li><p class="first">Open another terminal to run <tt class="docutils literal"><span class="pre">ConsoleWriter</span></tt>. It would fail with
<tt class="docutils literal"><span class="pre">OwnershipAcquireFailedException</span></tt> as previous <tt class="docutils literal"><span class="pre">ConsoleWriter</span></tt> is
still holding lock on writing to stream <tt class="docutils literal"><span class="pre">basic-stream-1</span></tt>.</p>
<div class="highlight-python"><pre>Opening log stream basic-stream-1
Exception in thread "main" com.twitter.distributedlog.exceptions.OwnershipAcquireFailedException: LockPath - /messaging/distributedlog/basic-stream-1/&lt;default&gt;/lock: Lock acquisition failed, the current owner is console-writer
at com.twitter.distributedlog.lock.ZKSessionLock$8.apply(ZKSessionLock.java:570)
at com.twitter.distributedlog.lock.ZKSessionLock$8.apply(ZKSessionLock.java:567)
at com.twitter.util.Future$$anonfun$map$1$$anonfun$apply$8.apply(Future.scala:1041)
at com.twitter.util.Try$.apply(Try.scala:13)
at com.twitter.util.Future$.apply(Future.scala:132)
at com.twitter.util.Future$$anonfun$map$1.apply(Future.scala:1041)
at com.twitter.util.Future$$anonfun$map$1.apply(Future.scala:1040)
at com.twitter.util.Promise$Transformer.liftedTree1$1(Promise.scala:112)
at com.twitter.util.Promise$Transformer.k(Promise.scala:112)
at com.twitter.util.Promise$Transformer.apply(Promise.scala:122)
at com.twitter.util.Promise$Transformer.apply(Promise.scala:103)
at com.twitter.util.Promise$$anon$1.run(Promise.scala:357)
at com.twitter.concurrent.LocalScheduler$Activation.run(Scheduler.scala:178)
at com.twitter.concurrent.LocalScheduler$Activation.submit(Scheduler.scala:136)
at com.twitter.concurrent.LocalScheduler.submit(Scheduler.scala:207)
at com.twitter.concurrent.Scheduler$.submit(Scheduler.scala:92)
at com.twitter.util.Promise.runq(Promise.scala:350)
at com.twitter.util.Promise.updateIfEmpty(Promise.scala:716)
at com.twitter.util.Promise.update(Promise.scala:694)
at com.twitter.util.Promise.setValue(Promise.scala:670)
at com.twitter.distributedlog.lock.ZKSessionLock$9.safeRun(ZKSessionLock.java:622)
at org.apache.bookkeeper.util.SafeRunnable.run(SafeRunnable.java:31)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)</pre>
<div style='display:none;' class='raw-code'><pre>Opening log stream basic-stream-1
Exception in thread "main" com.twitter.distributedlog.exceptions.OwnershipAcquireFailedException: LockPath - /messaging/distributedlog/basic-stream-1/&lt;default&gt;/lock: Lock acquisition failed, the current owner is console-writer
at com.twitter.distributedlog.lock.ZKSessionLock$8.apply(ZKSessionLock.java:570)
at com.twitter.distributedlog.lock.ZKSessionLock$8.apply(ZKSessionLock.java:567)
at com.twitter.util.Future$$anonfun$map$1$$anonfun$apply$8.apply(Future.scala:1041)
at com.twitter.util.Try$.apply(Try.scala:13)
at com.twitter.util.Future$.apply(Future.scala:132)
at com.twitter.util.Future$$anonfun$map$1.apply(Future.scala:1041)
at com.twitter.util.Future$$anonfun$map$1.apply(Future.scala:1040)
at com.twitter.util.Promise$Transformer.liftedTree1$1(Promise.scala:112)
at com.twitter.util.Promise$Transformer.k(Promise.scala:112)
at com.twitter.util.Promise$Transformer.apply(Promise.scala:122)
at com.twitter.util.Promise$Transformer.apply(Promise.scala:103)
at com.twitter.util.Promise$$anon$1.run(Promise.scala:357)
at com.twitter.concurrent.LocalScheduler$Activation.run(Scheduler.scala:178)
at com.twitter.concurrent.LocalScheduler$Activation.submit(Scheduler.scala:136)
at com.twitter.concurrent.LocalScheduler.submit(Scheduler.scala:207)
at com.twitter.concurrent.Scheduler$.submit(Scheduler.scala:92)
at com.twitter.util.Promise.runq(Promise.scala:350)
at com.twitter.util.Promise.updateIfEmpty(Promise.scala:716)
at com.twitter.util.Promise.update(Promise.scala:694)
at com.twitter.util.Promise.setValue(Promise.scala:670)
at com.twitter.distributedlog.lock.ZKSessionLock$9.safeRun(ZKSessionLock.java:622)
at org.apache.bookkeeper.util.SafeRunnable.run(SafeRunnable.java:31)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)</pre>
</div></div>
</li>
</ol>
</div>
</div>
</div>
</div>
<div class="hidden-xs col-sm-3 col-md-3 col-md-offset-1 col-lg-3 db-sidebar">
<div class="db-toc" role="complementary">
<ul class="current">
<li class="toctree-l0 current"><a class="current reference internal" href="../index.html">DistributedLog</a></li>
</ul>
<ul>
<li class="toctree-l1"><a class="reference internal" href="../download.html">Releases</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../download.html#rc1">0.3.51-RC1</a></li>
<li class="toctree-l2"><a class="reference internal" href="../download.html#rc0">0.3.51-RC0</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../basics/main.html">Getting Started</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../basics/introduction.html">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="../basics/quickstart.html">Quick Start</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../api/main.html">API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../api/core.html">Core Library API</a></li>
<li class="toctree-l2"><a class="reference internal" href="../api/proxy.html">Write Proxy Client API</a></li>
<li class="toctree-l2"><a class="reference internal" href="../api/practice.html">Best Practices</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../configuration/main.html">Configuration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../configuration/core.html">Core Library Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/proxy.html">Write Proxy Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/client.html">Client Configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="../configuration/perlog.html">Per Stream Configuration</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../considerations/main.html">Considerations</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#consistency-durability-and-ordering">Consistency, Durability and Ordering</a></li>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#partitioning">Partitioning</a></li>
<li class="toctree-l2"><a class="reference internal" href="../considerations/main.html#processing-semantics">Processing Semantics</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../architecture/main.html">Architecture</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#data-model">Data Model</a></li>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#software-stack">Software Stack</a></li>
<li class="toctree-l2"><a class="reference internal" href="../architecture/main.html#lifecyle-of-records">Lifecyle of records</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../design/main.html">Detail Design</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#consistency">Consistency</a></li>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#streaming-reads">Streaming Reads</a></li>
<li class="toctree-l2"><a class="reference internal" href="../design/main.html#logsegment-lifecycle">LogSegment Lifecycle</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../globalreplicatedlog/main.html">Global Replicated Log</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#region-aware-data-placement-policy">Region Aware Data Placement Policy</a></li>
<li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#cross-region-speculative-reads">Cross Region Speculative Reads</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../implementation/main.html">Implementation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../implementation/storage.html">Storage</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../operations/main.html">Deployment &amp; Administration</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../operations/deployment.html">Cluster Setup &amp; Deployment</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/operations.html">DistributedLog Operations</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/performance.html">Performance Tuning</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/hardware.html">Hardware</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/monitoring.html">Monitoring</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/zookeeper.html">ZooKeeper</a></li>
<li class="toctree-l2"><a class="reference internal" href="../operations/bookkeeper.html">BookKeeper</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../performance/main.html">Performance</a></li>
<li class="toctree-l1"><a class="reference internal" href="../references/main.html">References</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../references/configuration.html">Configuration Settings</a></li>
<li class="toctree-l2"><a class="reference internal" href="../references/metrics.html">Metrics</a></li>
<li class="toctree-l2"><a class="reference internal" href="../references/features.html">Features</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="main.html">Tutorials</a><ul>
<li class="toctree-l2"><a class="reference internal" href="main.html#basic">Basic</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#messaging">Messaging</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#replicated-state-machines">Replicated State Machines</a></li>
<li class="toctree-l2"><a class="reference internal" href="main.html#analytics">Analytics</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../developer/main.html">Developer</a><ul>
<li class="toctree-l2"><a class="reference internal" href="../developer/release.html">Release</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="../faq.html">FAQ</a></li>
</ul>
<span id="last"></span>
</div>
</div>
<!-- <div id="slidebox"> -->
<!-- <button id="slidebox_close" type="button" class="close">&times;</button> -->
<!-- <p>Rate This Page</p> -->
<!-- <div id="rateYo"></div> -->
<!-- <p>Comment</p>
<input type="text" name="comment"></input>
<button>Submit</button> -->
<!-- </div> -->
</div>
</div>
<footer class="footer">
<div class="container-fluid">
<div class="row">
<div class="col-md-10 col-md-offset-1">
<p class="pull-right">
<a href="#">Back to top</a>
<br/>
<div id="sourcelink">
<a href="git@github.com:twitter/distributedlog.git/tree/master/docs/tutorials/basic-1.rst"
rel="nofollow">Source</a>
<a href="../_sources/tutorials/basic-1.txt"
rel="nofollow">Raw</a>
<a href="../__docbird-build.log"
rel="nofollow">Build Log</a>
<a href="/report/stats/distributedlog:distributedlog"
rel="nofollow">Stats</a>
</div>
</p>
<p>
Built and hosted by <a href="/">DocBird</a>.
</p>
</div>
</div>
</div>
</footer>
<script type="text/javascript" src="../_static/js/docbird.js"></script>
<script type="text/javascript">
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-30775-8']);
_gaq.push(['_trackPageview']);
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();
</script>
<!-- <script type="text/javascript" src="//s/d41d8cd98f00b204e9800998ecf8427e/en_US-tbnx1s-1988229788/6163/97/1.4.3/_/download/batch/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector/com.atlassian.jira.collector.plugin.jira-issue-collector-plugin:issuecollector.js?collectorId=e62237fc"></script>
-->
<script type="text/javascript">
$(document).ready(function () {
// track user activity time (from https://github.com/jasonzissman/TimeMe.js)
TimeMe.setIdleDurationInSeconds(30);
TimeMe.setCurrentPageName("my-home-page");
TimeMe.initialize();
// record page visit event when user leaves the page
window.onbeforeunload = function (event) {
xmlhttp=new XMLHttpRequest();
xmlhttp.withCredentials = true;
xmlhttp.open("POST", "/event/distributedlog:distributedlog/visit", false);
xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
var event_data = {
total_time_reading: TimeMe.getTimeOnCurrentPageInSeconds(),
page: window.location.href
};
//alert("send: " + $.param(event_data));
xmlhttp.send($.param(event_data));
};
// ask user for page rating after 20 seconds
// setTimeout(function(){
// alert("Rate this page!");
// }, 20000);
});
</script>
<!-- <style>
#slidebox{
width: 250px;
height: 90px;
padding: 10px;
background-color: #fff;
border: 1px solid #ccc;
position: fixed;
bottom: 3px;
right: -280px;
z-index: 1;
}
#slidebox .close{
margin-top: -5px;
opacity: 0.5;
}
#slidebox .close:hover{
opacity: 0.7;
}
</style> -->
<script type="text/javascript">
$(function() {
// $(window).scroll(function(){
// var distanceTop = $('#last').offset().top - $(window).height();
// if ($(window).scrollTop() > distanceTop)
// $('#slidebox').animate({'right':'3px'},300);
// else
// $('#slidebox').stop(true).animate({'right':'-280px'},100);
// });
// $('#slidebox .close').bind('click',function(){
// $(this).parent().remove();
// });
$("#rateYo").rateYo({
normalFill: "#A0A0A0",
halfStar: true,
rating: (Cookies.get('docbird.rating.distributedlog.distributedlog') || 0.0)
}).on("rateyo.set", function (e, data) {
var event_data = {
comment: '', // see todo note below
rating: data.rating,
page: window.location.href
};
Cookies.get('docbird.rating.distributedlog.distributedlog', data.rating)
$.post('/event/distributedlog:distributedlog/rating', event_data)
// xmlhttp=new XMLHttpRequest();
// xmlhttp.withCredentials = true;
// var event_data = {
// comment: '', // see todo note below
// rating: data.rating,
// page: window.location.href
// };
// xmlhttp.open("GET", "/event/distributedlog/rating?" + $.param(event_data), false);
// xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
// // todo: implement comment form in rating slide out,
// // and instead of hooking this event, include a submit button,
// // and read the rating with rating() method
// // alert("send: " + $.param(event_data));
// xmlhttp.send();
});
});
</script>
<script src="_static/js/selection-sharer.js"></script>
<script>
$('.db-content-body').selectionSharer();
</script>
</body>
</html>