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<div class="section" id="write-records-using-write-proxy-client">
<h1>Write Records using Write Proxy Client<a class="headerlink" href="#write-records-using-write-proxy-client" title="Permalink to this headline">¶</a></h1>
<p>This tutorial shows how to write records using write proxy client.</p>
<div class="section" id="open-a-write-proxy-client">
<h2>Open a write proxy client<a class="headerlink" href="#open-a-write-proxy-client" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Create write proxy client builder.</p>
<div class="highlight-python"><pre>DistributedLogClientBuilder builder = DistributedLogClientBuilder.newBuilder();
.clientId(ClientId.apply("console-proxy-writer"))
.name("console-proxy-writer");</pre>
<div style='display:none;' class='raw-code'><pre>DistributedLogClientBuilder builder = DistributedLogClientBuilder.newBuilder();
.clientId(ClientId.apply("console-proxy-writer"))
.name("console-proxy-writer");</pre>
</div></div>
</li>
<li><p class="first">Enable thrift mux.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">builder</span> <span class="o">=</span> <span class="n">builder</span><span class="o">.</span><span class="n">thriftmux</span><span class="p">(</span><span class="n">true</span><span class="p">);</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>builder = builder.thriftmux(true);</pre>
</div></div>
</li>
<li><p class="first">Point the client to write proxy using finagle name.</p>
<div class="highlight-python"><pre>String finagleNameStr = "inet!127.0.0.1:8000";
builder = builder.finagleNameStr(finagleNameStr);</pre>
<div style='display:none;' class='raw-code'><pre>String finagleNameStr = "inet!127.0.0.1:8000";
builder = builder.finagleNameStr(finagleNameStr);</pre>
</div></div>
</li>
<li><p class="first">Build the write proxy client.</p>
<div class="highlight-python"><pre>DistributedLogClient client = builder.build();</pre>
<div style='display:none;' class='raw-code'><pre>DistributedLogClient client = builder.build();</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">Write records to a stream. Application does not provide
<tt class="docutils literal"><span class="pre">TransactionID</span></tt> on writing. The <tt class="docutils literal"><span class="pre">TransactionID</span></tt> of a record is
assigned by the write proxy.</p>
<div class="highlight-python"><pre>String streamName = "basic-stream-2";
byte[] data = ...;
Future&lt;DLSN&gt; writeFuture = client.write(streamName, ByteBuffer.wrap(data));</pre>
<div style='display:none;' class='raw-code'><pre>String streamName = "basic-stream-2";
byte[] data = ...;
Future&lt;DLSN&gt; writeFuture = client.write(streamName, ByteBuffer.wrap(data));</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-write-proxy-client">
<h2>Close the write proxy client<a class="headerlink" href="#close-the-write-proxy-client" title="Permalink to this headline">¶</a></h2>
<ul>
<li><p class="first">Close the write proxy client after usage.</p>
<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">client</span><span class="o">.</span><span class="n">close</span><span class="p">();</span>
</pre></div>
<div style='display:none;' class='raw-code'><pre>client.close();</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">Start the write proxy, listening on port 8000.</p>
<div class="highlight-python"><pre>// DistributedLogServerApp -p ${service-port} --shard-id ${shard-id} -sp ${stats-port} -u {distributedlog-uri} -mx -c ${conf-file}
./distributedlog-service/bin/dlog com.twitter.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 style='display:none;' class='raw-code'><pre>// DistributedLogServerApp -p ${service-port} --shard-id ${shard-id} -sp ${stats-port} -u {distributedlog-uri} -mx -c ${conf-file}
./distributedlog-service/bin/dlog com.twitter.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>
</li>
<li><p class="first">Create the stream under the distributedlog uri.</p>
<div class="highlight-python"><pre>// Create Stream `basic-stream-2`
// 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 2</pre>
<div style='display:none;' class='raw-code'><pre>// Create Stream `basic-stream-2`
// 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 2</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-2`
// 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-2</pre>
<div style='display:none;' class='raw-code'><pre>// Tailing Stream `basic-stream-2`
// 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-2</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-2`
// runner run com.twitter.distributedlog.basic.ConsoleProxyWriter ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.ConsoleProxyWriter 'inet!127.0.0.1:8000' basic-stream-2</pre>
<div style='display:none;' class='raw-code'><pre>// Write Records into Stream `basic-stream-2`
// runner run com.twitter.distributedlog.basic.ConsoleProxyWriter ${distributedlog-uri} ${stream}
./distributedlog-tutorials/distributedlog-basic/bin/runner run com.twitter.distributedlog.basic.ConsoleProxyWriter 'inet!127.0.0.1:8000' basic-stream-2</pre>
</div></div>
</li>
<li><p class="first">Example output from <tt class="docutils literal"><span class="pre">ConsoleProxyWriter</span></tt> and <tt class="docutils literal"><span class="pre">TailReader</span></tt>.</p>
<div class="highlight-python"><pre>// Output of `ConsoleProxyWriter`
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@756d7bba)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@1d2e91f5)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@5c707aca)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@5c8d932f)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@52ba2221)
May 08, 2016 10:27:41 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp
[dlog] &gt; test-proxy-writer
[dlog] &gt;
// Output of `TailReader`
Opening log stream basic-stream-2
Log stream basic-stream-2 is empty.
Wait for records starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
"""
test-proxy-writer
"""</pre>
<div style='display:none;' class='raw-code'><pre>// Output of `ConsoleProxyWriter`
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@756d7bba)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@1d2e91f5)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@5c707aca)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@5c8d932f)
May 08, 2016 10:27:41 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@52ba2221)
May 08, 2016 10:27:41 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp
[dlog] &gt; test-proxy-writer
[dlog] &gt;
// Output of `TailReader`
Opening log stream basic-stream-2
Log stream basic-stream-2 is empty.
Wait for records starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0}
"""
test-proxy-writer
"""</pre>
</div></div>
</li>
<li><p class="first">Open another terminal to run <tt class="docutils literal"><span class="pre">ConsoleProxyWriter</span></tt>. The write should
succeed as write proxy is able to accept fan-in writes. Please
checkout section <tt class="docutils literal"><span class="pre">Considerations</span></tt> to see the difference between
<strong>Write Ordering</strong> and <strong>Read Ordering</strong>.</p>
<div class="highlight-python"><pre>May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@756d7bba)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@1d2e91f5)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@5c707aca)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@5c8d932f)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@52ba2221)
May 08, 2016 10:31:54 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp
[dlog] &gt; test-write-proxy-message-2
[dlog] &gt;</pre>
<div style='display:none;' class='raw-code'><pre>May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@756d7bba)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@1d2e91f5)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@5c707aca)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@5c8d932f)
May 08, 2016 10:31:54 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply
INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@52ba2221)
May 08, 2016 10:31:54 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp
[dlog] &gt; test-write-proxy-message-2
[dlog] &gt;</pre>
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