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<div class="contents topic" id="basic-tutorial-write-multi-records-atomic-using-write-proxy-client">
<p class="topic-title first">Basic Tutorial - Write Multi Records Atomic using Write Proxy Client</p>
<ul class="auto-toc simple">
<li><a class="reference internal" href="#write-multi-records-atomic-using-write-proxy-client" id="id2">1&nbsp;&nbsp;&nbsp;Write Multi Records Atomic using Write Proxy Client</a><ul class="auto-toc">
<li><a class="reference internal" href="#open-a-write-proxy-client" id="id3">1.1&nbsp;&nbsp;&nbsp;Open a write proxy client</a><ul class="auto-toc">
<li><a class="reference internal" href="#create-write-proxy-client-builder" id="id4">1.1.1&nbsp;&nbsp;&nbsp;Create write proxy client builder</a></li>
<li><a class="reference internal" href="#enable-thrift-mux" id="id5">1.1.2&nbsp;&nbsp;&nbsp;Enable thrift mux</a></li>
<li><a class="reference internal" href="#point-the-client-to-write-proxy-using-finagle-name" id="id6">1.1.3&nbsp;&nbsp;&nbsp;Point the client to write proxy using finagle name</a></li>
<li><a class="reference internal" href="#build-the-write-proxy-client" id="id7">1.1.4&nbsp;&nbsp;&nbsp;Build the write proxy client</a></li>
</ul>
</li>
<li><a class="reference internal" href="#write-records" id="id8">1.2&nbsp;&nbsp;&nbsp;Write Records</a><ul class="auto-toc">
<li><a class="reference internal" href="#create-a-recordset" id="id9">1.2.1&nbsp;&nbsp;&nbsp;Create a RecordSet</a></li>
<li><a class="reference internal" href="#write-multiple-records" id="id10">1.2.2&nbsp;&nbsp;&nbsp;Write multiple records</a></li>
<li><a class="reference internal" href="#write-the-recordset" id="id11">1.2.3&nbsp;&nbsp;&nbsp;Write the RecordSet</a></li>
<li><a class="reference internal" href="#register-the-write-callback" id="id12">1.2.4&nbsp;&nbsp;&nbsp;Register the write callback</a></li>
</ul>
</li>
<li><a class="reference internal" href="#close-the-write-proxy-client" id="id13">1.3&nbsp;&nbsp;&nbsp;Close the write proxy client</a></li>
<li><a class="reference internal" href="#run-the-tutorial" id="id14">1.4&nbsp;&nbsp;&nbsp;Run the tutorial</a><ul class="auto-toc">
<li><a class="reference internal" href="#start-the-local-bookkeeper-cluster" id="id15">1.4.1&nbsp;&nbsp;&nbsp;Start the local bookkeeper cluster</a></li>
<li><a class="reference internal" href="#start-the-write-proxy" id="id16">1.4.2&nbsp;&nbsp;&nbsp;Start the write proxy</a></li>
<li><a class="reference internal" href="#create-the-stream" id="id17">1.4.3&nbsp;&nbsp;&nbsp;Create the stream</a></li>
<li><a class="reference internal" href="#tail-the-stream" id="id18">1.4.4&nbsp;&nbsp;&nbsp;Tail the stream</a></li>
<li><a class="reference internal" href="#id1" id="id19">1.4.5&nbsp;&nbsp;&nbsp;Write records</a></li>
<li><a class="reference internal" href="#check-the-results" id="id20">1.4.6&nbsp;&nbsp;&nbsp;Check the results</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="write-multi-records-atomic-using-write-proxy-client">
<h2><a class="toc-backref" href="#id2">1&nbsp;&nbsp;&nbsp;Write Multi Records Atomic using Write Proxy Client</a></h2>
<p>This tutorial shows how to write multi records atomic using write proxy client.</p>
<div class="section" id="open-a-write-proxy-client">
<h3><a class="toc-backref" href="#id3">1.1&nbsp;&nbsp;&nbsp;Open a write proxy client</a></h3>
<div class="section" id="create-write-proxy-client-builder">
<h4><a class="toc-backref" href="#id4">1.1.1&nbsp;&nbsp;&nbsp;Create write proxy client builder</a></h4>
<pre class="literal-block">
DistributedLogClientBuilder builder = DistributedLogClientBuilder.newBuilder();
.clientId(ClientId.apply(&quot;atomic-writer&quot;))
.name(&quot;atomic-writer&quot;);
</pre>
</div>
<div class="section" id="enable-thrift-mux">
<h4><a class="toc-backref" href="#id5">1.1.2&nbsp;&nbsp;&nbsp;Enable thrift mux</a></h4>
<pre class="literal-block">
builder = builder.thriftmux(true);
</pre>
</div>
<div class="section" id="point-the-client-to-write-proxy-using-finagle-name">
<h4><a class="toc-backref" href="#id6">1.1.3&nbsp;&nbsp;&nbsp;Point the client to write proxy using finagle name</a></h4>
<pre class="literal-block">
String finagleNameStr = &quot;inet!127.0.0.1:8000&quot;;
builder = builder.finagleNameStr(finagleNameStr);
</pre>
</div>
<div class="section" id="build-the-write-proxy-client">
<h4><a class="toc-backref" href="#id7">1.1.4&nbsp;&nbsp;&nbsp;Build the write proxy client</a></h4>
<pre class="literal-block">
DistributedLogClient client = builder.build();
</pre>
</div>
</div>
<div class="section" id="write-records">
<h3><a class="toc-backref" href="#id8">1.2&nbsp;&nbsp;&nbsp;Write Records</a></h3>
<div class="section" id="create-a-recordset">
<h4><a class="toc-backref" href="#id9">1.2.1&nbsp;&nbsp;&nbsp;Create a RecordSet</a></h4>
<p>Create a <cite>RecordSet</cite> for multiple records. The RecordSet has initial <cite>16KB</cite> buffer and its
compression codec is <cite>NONE</cite>.</p>
<pre class="literal-block">
LogRecordSet.Writer recordSetWriter = LogRecordSet.newWriter(16 * 1024, Type.NONE);
</pre>
</div>
<div class="section" id="write-multiple-records">
<h4><a class="toc-backref" href="#id10">1.2.2&nbsp;&nbsp;&nbsp;Write multiple records</a></h4>
<p>Write multiple records into the <cite>RecordSet</cite>.</p>
<pre class="literal-block">
for (String msg : messages) {
ByteBuffer msgBuf = ByteBuffer.wrap(msg.getBytes(UTF_8));
Promise&lt;DLSN&gt; writeFuture = new Promise&lt;DLSN&gt;();
recordSetWriter.writeRecord(msgBuf, writeFuture);
}
</pre>
</div>
<div class="section" id="write-the-recordset">
<h4><a class="toc-backref" href="#id11">1.2.3&nbsp;&nbsp;&nbsp;Write the RecordSet</a></h4>
<p>Write the <cite>RecordSet</cite> to a stream.</p>
<pre class="literal-block">
String streamName = &quot;basic-stream-8&quot;;
Future&lt;DLSN&gt; writeFuture = client.writeRecordSet(streamName, recordSetWriter);
</pre>
</div>
<div class="section" id="register-the-write-callback">
<h4><a class="toc-backref" href="#id12">1.2.4&nbsp;&nbsp;&nbsp;Register the write callback</a></h4>
<p>Register a future listener on write completion. The writer will be notified once the write is completed.</p>
<pre class="literal-block">
writeFuture.addEventListener(new FutureEventListener&lt;DLSN&gt;() {
&#64;Override
public void onFailure(Throwable cause) {
// executed when write failed.
recordSetWriter.abortTransmit(cause);
}
&#64;Override
public void onSuccess(DLSN value) {
// executed when write completed.
recordSetWriter.completeTransmit(
dlsn.getLogSegmentSequenceNo(),
dlsn.getEntryId(),
dlsn.getSlotId());
}
});
</pre>
</div>
</div>
<div class="section" id="close-the-write-proxy-client">
<h3><a class="toc-backref" href="#id13">1.3&nbsp;&nbsp;&nbsp;Close the write proxy client</a></h3>
<p>Close the write proxy client after usage.</p>
<pre class="literal-block">
client.close();
</pre>
</div>
<div class="section" id="run-the-tutorial">
<h3><a class="toc-backref" href="#id14">1.4&nbsp;&nbsp;&nbsp;Run the tutorial</a></h3>
<p>Run the example in the following steps:</p>
<div class="section" id="start-the-local-bookkeeper-cluster">
<h4><a class="toc-backref" href="#id15">1.4.1&nbsp;&nbsp;&nbsp;Start the local bookkeeper cluster</a></h4>
<p>You can use follow command to start the distributedlog stack locally.
After the distributedlog cluster is started, you could access it using
distributedlog uri <em>distributedlog://127.0.0.1:7000/messaging/distributedlog</em>.</p>
<pre class="literal-block">
// dlog local ${zk-port}
./distributedlog-core/bin/dlog local 7000
</pre>
</div>
<div class="section" id="start-the-write-proxy">
<h4><a class="toc-backref" href="#id16">1.4.2&nbsp;&nbsp;&nbsp;Start the write proxy</a></h4>
<p>Start the write proxy, listening on port 8000.</p>
<pre class="literal-block">
// DistributedLogServerApp -p ${service-port} --shard-id ${shard-id} -sp ${stats-port} -u {distributedlog-uri} -mx -c ${conf-file}
./distributedlog-service/bin/dlog org.apache.distributedlog.service.DistributedLogServerApp -p 8000 --shard-id 1 -sp 8001 -u distributedlog://127.0.0.1:7000/messaging/distributedlog -mx -c ${distributedlog-repo}/distributedlog-service/conf/distributedlog_proxy.conf
</pre>
</div>
<div class="section" id="create-the-stream">
<h4><a class="toc-backref" href="#id17">1.4.3&nbsp;&nbsp;&nbsp;Create the stream</a></h4>
<p>Create the stream under the distributedlog uri.</p>
<pre class="literal-block">
// Create Stream `basic-stream-8`
// 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 8
</pre>
</div>
<div class="section" id="tail-the-stream">
<h4><a class="toc-backref" href="#id18">1.4.4&nbsp;&nbsp;&nbsp;Tail the stream</a></h4>
<p>Tailing the stream using <cite>TailReader</cite> to wait for new records.</p>
<pre class="literal-block">
// Tailing Stream `basic-stream-8`
// runner run org.apache.distributedlog.basic.TailReader ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run org.apache.distributedlog.basic.TailReader distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-8
</pre>
</div>
<div class="section" id="id1">
<h4><a class="toc-backref" href="#id19">1.4.5&nbsp;&nbsp;&nbsp;Write records</a></h4>
<p>Run the example to write multiple records to the stream.</p>
<pre class="literal-block">
// Write Records into Stream `basic-stream-8`
// runner run org.apache.distributedlog.basic.AtomicWriter ${distributedlog-uri} ${stream} ${message}[, ${message}]
./distributedlog-tutorials/distributedlog-basic/bin/runner run org.apache.distributedlog.basic.AtomicWriter 'inet!127.0.0.1:8000' basic-stream-8 &quot;message-1&quot; &quot;message-2&quot; &quot;message-3&quot; &quot;message-4&quot; &quot;message-5&quot;
</pre>
</div>
<div class="section" id="check-the-results">
<h4><a class="toc-backref" href="#id20">1.4.6&nbsp;&nbsp;&nbsp;Check the results</a></h4>
<p>Example output from <cite>AtomicWriter</cite> and <cite>TailReader</cite>.</p>
<pre class="literal-block">
// Output of `AtomicWriter`
May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver&#64;6c3e459e)
May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver&#64;4d5698f)
May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$&#64;57052dc3)
May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$&#64;14ff89d7)
May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$&#64;14b28d06)
May 08, 2016 11:48:19 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp
Write 'message-1' as record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Write 'message-2' as record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=1}
Write 'message-3' as record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=2}
Write 'message-4' as record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=3}
Write 'message-5' as record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=4}
// Output of `TailReader`
Opening log stream basic-stream-8
Log stream basic-stream-8 is empty.
Wait for records starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
&quot;&quot;&quot;
message-1
&quot;&quot;&quot;
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=1}
&quot;&quot;&quot;
message-2
&quot;&quot;&quot;
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=2}
&quot;&quot;&quot;
message-3
&quot;&quot;&quot;
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=3}
&quot;&quot;&quot;
message-4
&quot;&quot;&quot;
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=4}
&quot;&quot;&quot;
message-5
&quot;&quot;&quot;
</pre>
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