http://git-wip-us.apache.org/repos/asf/incubator-distributedlog/blob/ef7245e8/content/docs/0.4.0-incubating/tutorials/basic-3.html ---------------------------------------------------------------------- diff --git a/content/docs/0.4.0-incubating/tutorials/basic-3.html b/content/docs/0.4.0-incubating/tutorials/basic-3.html new file mode 100644 index 0000000..8efe2d1 --- /dev/null +++ b/content/docs/0.4.0-incubating/tutorials/basic-3.html @@ -0,0 +1,644 @@ +<!DOCTYPE html> +<html lang="en"> + + <head> + <meta charset="utf-8"> + <meta http-equiv="X-UA-Compatible" content="IE=edge"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + + <title>API - Write Records to Multiple Streams</title> + <meta name="description" content="Apache DistributedLog is an high performance replicated log. +"> + + <link rel="stylesheet" href="/docs/0.4.0-incubating/styles/site.css"> + <link rel="stylesheet" href="/docs/0.4.0-incubating/css/theme.css"> + <!-- JQuery --> + <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js";></script> + <script src="/docs/0.4.0-incubating/js/bootstrap.min.js"></script> + <link rel="canonical" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/tutorials/basic-3.html"; data-proofer-ignore> + <link rel="alternate" type="application/rss+xml" title="Apache DistributedLog (incubating)" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/feed.xml";> + <!-- Font Awesome --> + <script src="//cdnjs.cloudflare.com/ajax/libs/anchor-js/3.2.0/anchor.min.js"></script> + <!-- Google Analytics --> + <script> + (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ + (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), + m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) + })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); + + ga('create', 'UA-83870961-1', 'auto'); + ga('send', 'pageview'); + </script> + <!-- End Google Analytics --> + <link rel="shortcut icon" type="image/x-icon" href="/images/favicon.ico"> +</head> + + + <body role="document"> + + +<nav class="navbar navbar-default navbar-fixed-top"> + <div class="container"> + <div class="navbar-header"> + <a href="/" class="navbar-brand" > + <img alt="Brand" style="height: 28px" src="/docs/0.4.0-incubating/images/distributedlog_logo_navbar.png"> + </a> + <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> + <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 id="navbar" class="navbar-collapse collapse"> + <ul class="nav navbar-nav"> + <!-- Overview --> + <li><a href="/docs/0.4.0-incubating/">V0.4.0</a></li> + <!-- Concepts --> + <li><a href="/docs/0.4.0-incubating/basics/introduction">Concepts</a></li> + <!-- Quick Start --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Start<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + + + <li> + <a href="/docs/0.4.0-incubating/start/building.html"> + Build DistributedLog from Source + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/start/download.html"> + Download Releases + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Quickstart</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/start/quickstart.html"> + Setup & Run Example + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-1.html"> + API - Write Records (via core library) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-2.html"> + API - Write Records (via write proxy) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-5.html"> + API - Read Records + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Deployment</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/deployment/cluster.html"> + Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/global-cluster.html"> + Global Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/docker.html"> + Docker + </a> + </li> + + </ul> + </li> + <!-- API --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">API<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + <li><a href="/docs/0.4.0-incubating/api/java">Java</a></li> + </ul> + </li> + <!-- User Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">User Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + + + <li> + <a href="/docs/0.4.0-incubating/basics/introduction.html"> + Introduction + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/considerations/main.html"> + Considerations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/architecture/main.html"> + Architecture + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/api/main.html"> + API + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/configuration/main.html"> + Configuration + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/design/main.html"> + Detail Design + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/globalreplicatedlog/main.html"> + Global Replicated Log + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/implementation/main.html"> + Implementation + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/references/main.html"> + References + </a> + </li> + + </ul> + </li> + <!-- Admin Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Admin Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li><a href="/docs/0.4.0-incubating/deployment/cluster">Cluster Setup</a></li> + + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/operations.html"> + Operations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/performance.html"> + Performance Tuning + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/loadtest.html"> + Load Test + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/hardware.html"> + Hardware + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/monitoring.html"> + Monitoring + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/zookeeper.html"> + ZooKeeper + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/bookkeeper.html"> + BookKeeper + </a> + </li> + + </ul> + </li> + <!-- Tutorials --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Tutorials<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li class="dropdown-header"><strong>Basic</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-1">Write Records (via Core Library)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-2">Write Records (via Write Proxy)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-3">Write Records to multiple streams</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-4">Atomic Write Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-5">Tailing Read Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-6">Rewind Read Records</a></li> + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Messaging</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-1.html"> + Write records to partitioned streams + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-2.html"> + Write records to multiple streams (load balancer) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-3.html"> + At-least-once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-4.html"> + Exact-Once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-5.html"> + Implement a kafka-like pub/sub system + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Replicated State Machines</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/replicatedstatemachines.html"> + Build replicated state machines + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Analytics</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/analytics-mapreduce">Process log streams using MapReduce</a></li> + </ul> + </li> + </ul> + </div><!--/.nav-collapse --> + </div> +</nav> + + +<link rel="stylesheet" href=""> + + + <div class="container" role="main"> + + <div class="row"> + + <!-- +Licensed to the Apache Software Foundation (ASF) under one +or more contributor license agreements. See the NOTICE file +distributed with this work for additional information +regarding copyright ownership. The ASF licenses this file +to you under the Apache License, Version 2.0 (the +"License"); you may not use this file except in compliance +with the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, +software distributed under the License is distributed on an +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +KIND, either express or implied. See the License for the +specific language governing permissions and limitations +under the License. +--> + +<div class="col-md-8 col-md-offset-2"> + <div class="contents topic" id="basic-tutorial-write-records-to-multiple-streams"> +<p class="topic-title first">Basic Tutorial - Write Records to Multiple Streams</p> +<ul class="auto-toc simple"> +<li><a class="reference internal" href="#write-records-to-multiple-streams" id="id1">1 Write Records to Multiple Streams</a><ul class="auto-toc"> +<li><a class="reference internal" href="#open-a-write-proxy-client" id="id2">1.1 Open a write proxy client</a><ul class="auto-toc"> +<li><a class="reference internal" href="#create-write-proxy-client-builder" id="id3">1.1.1 Create write proxy client builder</a></li> +<li><a class="reference internal" href="#enable-thrift-mux" id="id4">1.1.2 Enable thrift mux</a></li> +<li><a class="reference internal" href="#point-the-client-to-write-proxy-using-finagle-name" id="id5">1.1.3 Point the client to write proxy using finagle name</a></li> +<li><a class="reference internal" href="#build-the-write-proxy-client" id="id6">1.1.4 Build the write proxy client</a></li> +</ul> +</li> +<li><a class="reference internal" href="#create-a-multistreamwriter" id="id7">1.2 Create a <cite>MultiStreamWriter</cite></a><ul class="auto-toc"> +<li><a class="reference internal" href="#create-multi-stream-writer-builder" id="id8">1.2.1 Create multi stream writer builder</a></li> +<li><a class="reference internal" href="#build-the-writer-to-write-a-set-of-streams" id="id9">1.2.2 Build the writer to write a set of streams</a></li> +<li><a class="reference internal" href="#point-the-multi-stream-writer-to-use-write-proxy-client" id="id10">1.2.3 Point the multi stream writer to use write proxy client</a></li> +<li><a class="reference internal" href="#configure-the-flush-policy-for-the-multi-stream-writer" id="id11">1.2.4 Configure the flush policy for the multi stream writer</a></li> +<li><a class="reference internal" href="#configure-the-request-timeouts-and-retry-policy-for-the-multi-stream-writer" id="id12">1.2.5 Configure the request timeouts and retry policy for the multi stream writer</a></li> +<li><a class="reference internal" href="#build-the-multi-writer" id="id13">1.2.6 Build the multi writer</a></li> +</ul> +</li> +<li><a class="reference internal" href="#write-records" id="id14">1.3 Write Records</a><ul class="auto-toc"> +<li><a class="reference internal" href="#write-records-to-multi-streams" id="id15">1.3.1 Write records to multi streams</a></li> +<li><a class="reference internal" href="#register-the-write-callback" id="id16">1.3.2 Register the write callback</a></li> +</ul> +</li> +<li><a class="reference internal" href="#run-the-tutorial" id="id17">1.4 Run the tutorial</a><ul class="auto-toc"> +<li><a class="reference internal" href="#start-the-local-bookkeeper-cluster" id="id18">1.4.1 Start the local bookkeeper cluster</a></li> +<li><a class="reference internal" href="#start-the-write-proxy" id="id19">1.4.2 Start the write proxy</a></li> +<li><a class="reference internal" href="#create-multiple-streams" id="id20">1.4.3 Create multiple streams</a></li> +<li><a class="reference internal" href="#tail-the-streams" id="id21">1.4.4 Tail the streams</a></li> +<li><a class="reference internal" href="#write-the-records" id="id22">1.4.5 Write the records</a></li> +<li><a class="reference internal" href="#check-the-results" id="id23">1.4.6 Check the results</a></li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +<div class="section" id="write-records-to-multiple-streams"> +<h2><a class="toc-backref" href="#id1">1 Write Records to Multiple Streams</a></h2> +<p>This tutorial shows how to write records using write proxy multi stream writer. The <cite>DistributedLogMultiStreamWriter</cite> +is a wrapper over <cite>DistributedLogClient</cite> on writing records to a set of streams in a <cite>round-robin</cite> way and ensure low write latency even on single stream ownership failover.</p> +<div class="section" id="open-a-write-proxy-client"> +<h3><a class="toc-backref" href="#id2">1.1 Open a write proxy client</a></h3> +<p>Before everything, you have to open a write proxy client to write records. +These are the steps to follow to <cite>open a write proxy client</cite>.</p> +<div class="section" id="create-write-proxy-client-builder"> +<h4><a class="toc-backref" href="#id3">1.1.1 Create write proxy client builder</a></h4> +<pre class="literal-block"> +DistributedLogClientBuilder builder = DistributedLogClientBuilder.newBuilder() + .clientId(ClientId.apply("console-proxy-writer")) + .name("console-proxy-writer"); +</pre> +</div> +<div class="section" id="enable-thrift-mux"> +<h4><a class="toc-backref" href="#id4">1.1.2 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="#id5">1.1.3 Point the client to write proxy using finagle name</a></h4> +<pre class="literal-block"> +String finagleNameStr = "inet!127.0.0.1:8000"; +builder = builder.finagleNameStr(finagleNameStr); +</pre> +</div> +<div class="section" id="build-the-write-proxy-client"> +<h4><a class="toc-backref" href="#id6">1.1.4 Build the write proxy client</a></h4> +<pre class="literal-block"> +DistributedLogClient client = builder.build(); +</pre> +</div> +</div> +<div class="section" id="create-a-multistreamwriter"> +<h3><a class="toc-backref" href="#id7">1.2 Create a <cite>MultiStreamWriter</cite></a></h3> +<div class="section" id="create-multi-stream-writer-builder"> +<h4><a class="toc-backref" href="#id8">1.2.1 Create multi stream writer builder</a></h4> +<pre class="literal-block"> +DistributedLogMultiStreamWriterBuilder builder = DistributedLogMultiStreamWriter.newBuilder(); +</pre> +</div> +<div class="section" id="build-the-writer-to-write-a-set-of-streams"> +<h4><a class="toc-backref" href="#id9">1.2.2 Build the writer to write a set of streams</a></h4> +<pre class="literal-block"> +List<String> streams = ...; +builder = builder.streams(streams); +</pre> +</div> +<div class="section" id="point-the-multi-stream-writer-to-use-write-proxy-client"> +<h4><a class="toc-backref" href="#id10">1.2.3 Point the multi stream writer to use write proxy client</a></h4> +<pre class="literal-block"> +builder = builder.client(client); +</pre> +</div> +<div class="section" id="configure-the-flush-policy-for-the-multi-stream-writer"> +<h4><a class="toc-backref" href="#id11">1.2.4 Configure the flush policy for the multi stream writer</a></h4> +<pre class="literal-block"> +// transmit immediately after a record is written. +builder = builder.bufferSize(0); +builder = builder.flushIntervalMs(0); +</pre> +</div> +<div class="section" id="configure-the-request-timeouts-and-retry-policy-for-the-multi-stream-writer"> +<h4><a class="toc-backref" href="#id12">1.2.5 Configure the request timeouts and retry policy for the multi stream writer</a></h4> +<pre class="literal-block"> +// Configure the speculative timeouts - if writing to a stream cannot +// complete within the speculative timeout, it would try writing to +// another streams. +builder = builder.firstSpeculativeTimeoutMs(10000) +builder = builder.maxSpeculativeTimeoutMs(20000) +// Configure the request timeout. +builder = builder.requestTimeoutMs(50000); +</pre> +</div> +<div class="section" id="build-the-multi-writer"> +<h4><a class="toc-backref" href="#id13">1.2.6 Build the multi writer</a></h4> +<pre class="literal-block"> +DistributedLogMultiStreamWriter writer = builder.build(); +</pre> +</div> +</div> +<div class="section" id="write-records"> +<h3><a class="toc-backref" href="#id14">1.3 Write Records</a></h3> +<div class="section" id="write-records-to-multi-streams"> +<h4><a class="toc-backref" href="#id15">1.3.1 Write records to multi streams</a></h4> +<pre class="literal-block"> +byte[] data = ...; +Future<DLSN> writeFuture = writer.write(ByteBuffer.wrap(data)); +</pre> +</div> +<div class="section" id="register-the-write-callback"> +<h4><a class="toc-backref" href="#id16">1.3.2 Register the write callback</a></h4> +<p>Register a future listener on write completion.</p> +<pre class="literal-block"> +writeFuture.addEventListener(new FutureEventListener<DLSN>() { + @Override + public void onFailure(Throwable cause) { + // executed when write failed. + } + + @Override + public void onSuccess(DLSN value) { + // executed when write completed. + } +}); +</pre> +</div> +</div> +<div class="section" id="run-the-tutorial"> +<h3><a class="toc-backref" href="#id17">1.4 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="#id18">1.4.1 Start the local bookkeeper cluster</a></h4> +<p>You can use follow command to start the distributedlog stack locally. +After the distributedlog 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="#id19">1.4.2 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-multiple-streams"> +<h4><a class="toc-backref" href="#id20">1.4.3 Create multiple streams</a></h4> +<p>Create multiple streams under the distributedlog uri.</p> +<pre class="literal-block"> +// Create Stream `basic-stream-{3-7}` +// 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 3-7 +</pre> +</div> +<div class="section" id="tail-the-streams"> +<h4><a class="toc-backref" href="#id21">1.4.4 Tail the streams</a></h4> +<p>Tailing the streams using <cite>MultiReader</cite> to wait for new records.</p> +<pre class="literal-block"> +// Tailing Stream `basic-stream-{3-7}` +// runner run org.apache.distributedlog.basic.MultiReader ${distributedlog-uri} ${stream}[,${stream}] +./distributedlog-tutorials/distributedlog-basic/bin/runner run org.apache.distributedlog.basic.MultiReader distributedlog://127.0.0.1:7000/messaging/distributedlog basic-stream-3,basic-stream-4,basic-stream-5,basic-stream-6,basic-stream-7 +</pre> +</div> +<div class="section" id="write-the-records"> +<h4><a class="toc-backref" href="#id22">1.4.5 Write the records</a></h4> +<p>Run the example to write records to the multi streams in a console.</p> +<pre class="literal-block"> +// Write Records into Stream `basic-stream-{3-7}` +// runner run org.apache.distributedlog.basic.ConsoleProxyMultiWriter ${distributedlog-uri} ${stream}[,${stream}] +./distributedlog-tutorials/distributedlog-basic/bin/runner run org.apache.distributedlog.basic.ConsoleProxyMultiWriter 'inet!127.0.0.1:8000' basic-stream-3,basic-stream-4,basic-stream-5,basic-stream-6,basic-stream-7 +</pre> +</div> +<div class="section" id="check-the-results"> +<h4><a class="toc-backref" href="#id23">1.4.6 Check the results</a></h4> +<p>Example output from <cite>ConsoleProxyMultiWriter</cite> and <cite>MultiReader</cite>.</p> +<pre class="literal-block"> +// Output of `ConsoleProxyWriter` +May 08, 2016 11:09:21 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@fbb628c) +May 08, 2016 11:09:21 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@5a25adb1) +May 08, 2016 11:09:21 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@5fae6db3) +May 08, 2016 11:09:21 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@34a433d8) +May 08, 2016 11:09:21 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@847c4e8) +May 08, 2016 11:09:22 AM com.twitter.finagle.Init$$anonfun$1 apply$mcV$sp +[dlog] > message-1 +[dlog] > message-2 +[dlog] > message-3 +[dlog] > message-4 +[dlog] > message-5 +[dlog] > + + +// Output of `MultiReader` +Opening log stream basic-stream-3 +Opening log stream basic-stream-4 +Opening log stream basic-stream-5 +Opening log stream basic-stream-6 +Opening log stream basic-stream-7 +Log stream basic-stream-4 is empty. +Wait for records from basic-stream-4 starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} +Open reader to read records from stream basic-stream-4 +Log stream basic-stream-5 is empty. +Wait for records from basic-stream-5 starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} +Open reader to read records from stream basic-stream-5 +Log stream basic-stream-6 is empty. +Wait for records from basic-stream-6 starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} +Open reader to read records from stream basic-stream-6 +Log stream basic-stream-3 is empty. +Wait for records from basic-stream-3 starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} +Open reader to read records from stream basic-stream-3 +Log stream basic-stream-7 is empty. +Wait for records from basic-stream-7 starting from DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} +Open reader to read records from stream basic-stream-7 +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} from stream basic-stream-4 +""" +message-1 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} from stream basic-stream-6 +""" +message-2 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} from stream basic-stream-3 +""" +message-3 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} from stream basic-stream-7 +""" +message-4 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=0} from stream basic-stream-5 +""" +message-5 +""" +</pre> +</div> +</div> +</div> + + +</div> + + + + </div> + + + <hr> + <div class="row"> + <div class="col-xs-12"> + <footer> + <p class="text-center">© Copyright 2016 + <a href="http://www.apache.org";>The Apache Software Foundation.</a> All Rights Reserved. + </p> + <p class="text-center"> + <a href="/docs/0.4.0-incubating/feed.xml">RSS Feed</a> + </p> + </footer> + </div> + </div> + <!-- container div end --> +</div> + + + <script> + (function () { + 'use strict'; + anchors.options.placement = 'right'; + anchors.add(); + })(); +</script> + + </body> + +</html>
http://git-wip-us.apache.org/repos/asf/incubator-distributedlog/blob/ef7245e8/content/docs/0.4.0-incubating/tutorials/basic-4.html ---------------------------------------------------------------------- diff --git a/content/docs/0.4.0-incubating/tutorials/basic-4.html b/content/docs/0.4.0-incubating/tutorials/basic-4.html new file mode 100644 index 0000000..39fe747 --- /dev/null +++ b/content/docs/0.4.0-incubating/tutorials/basic-4.html @@ -0,0 +1,601 @@ +<!DOCTYPE html> +<html lang="en"> + + <head> + <meta charset="utf-8"> + <meta http-equiv="X-UA-Compatible" content="IE=edge"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + + <title>API - Atomic Write Multiple Records</title> + <meta name="description" content="Apache DistributedLog is an high performance replicated log. +"> + + <link rel="stylesheet" href="/docs/0.4.0-incubating/styles/site.css"> + <link rel="stylesheet" href="/docs/0.4.0-incubating/css/theme.css"> + <!-- JQuery --> + <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js";></script> + <script src="/docs/0.4.0-incubating/js/bootstrap.min.js"></script> + <link rel="canonical" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/tutorials/basic-4.html"; data-proofer-ignore> + <link rel="alternate" type="application/rss+xml" title="Apache DistributedLog (incubating)" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/feed.xml";> + <!-- Font Awesome --> + <script src="//cdnjs.cloudflare.com/ajax/libs/anchor-js/3.2.0/anchor.min.js"></script> + <!-- Google Analytics --> + <script> + (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ + (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), + m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) + })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); + + ga('create', 'UA-83870961-1', 'auto'); + ga('send', 'pageview'); + </script> + <!-- End Google Analytics --> + <link rel="shortcut icon" type="image/x-icon" href="/images/favicon.ico"> +</head> + + + <body role="document"> + + +<nav class="navbar navbar-default navbar-fixed-top"> + <div class="container"> + <div class="navbar-header"> + <a href="/" class="navbar-brand" > + <img alt="Brand" style="height: 28px" src="/docs/0.4.0-incubating/images/distributedlog_logo_navbar.png"> + </a> + <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> + <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 id="navbar" class="navbar-collapse collapse"> + <ul class="nav navbar-nav"> + <!-- Overview --> + <li><a href="/docs/0.4.0-incubating/">V0.4.0</a></li> + <!-- Concepts --> + <li><a href="/docs/0.4.0-incubating/basics/introduction">Concepts</a></li> + <!-- Quick Start --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Start<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + + + <li> + <a href="/docs/0.4.0-incubating/start/building.html"> + Build DistributedLog from Source + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/start/download.html"> + Download Releases + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Quickstart</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/start/quickstart.html"> + Setup & Run Example + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-1.html"> + API - Write Records (via core library) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-2.html"> + API - Write Records (via write proxy) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-5.html"> + API - Read Records + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Deployment</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/deployment/cluster.html"> + Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/global-cluster.html"> + Global Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/docker.html"> + Docker + </a> + </li> + + </ul> + </li> + <!-- API --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">API<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + <li><a href="/docs/0.4.0-incubating/api/java">Java</a></li> + </ul> + </li> + <!-- User Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">User Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + + + <li> + <a href="/docs/0.4.0-incubating/basics/introduction.html"> + Introduction + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/considerations/main.html"> + Considerations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/architecture/main.html"> + Architecture + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/api/main.html"> + API + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/configuration/main.html"> + Configuration + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/design/main.html"> + Detail Design + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/globalreplicatedlog/main.html"> + Global Replicated Log + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/implementation/main.html"> + Implementation + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/references/main.html"> + References + </a> + </li> + + </ul> + </li> + <!-- Admin Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Admin Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li><a href="/docs/0.4.0-incubating/deployment/cluster">Cluster Setup</a></li> + + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/operations.html"> + Operations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/performance.html"> + Performance Tuning + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/loadtest.html"> + Load Test + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/hardware.html"> + Hardware + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/monitoring.html"> + Monitoring + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/zookeeper.html"> + ZooKeeper + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/bookkeeper.html"> + BookKeeper + </a> + </li> + + </ul> + </li> + <!-- Tutorials --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Tutorials<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li class="dropdown-header"><strong>Basic</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-1">Write Records (via Core Library)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-2">Write Records (via Write Proxy)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-3">Write Records to multiple streams</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-4">Atomic Write Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-5">Tailing Read Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-6">Rewind Read Records</a></li> + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Messaging</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-1.html"> + Write records to partitioned streams + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-2.html"> + Write records to multiple streams (load balancer) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-3.html"> + At-least-once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-4.html"> + Exact-Once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-5.html"> + Implement a kafka-like pub/sub system + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Replicated State Machines</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/replicatedstatemachines.html"> + Build replicated state machines + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Analytics</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/analytics-mapreduce">Process log streams using MapReduce</a></li> + </ul> + </li> + </ul> + </div><!--/.nav-collapse --> + </div> +</nav> + + +<link rel="stylesheet" href=""> + + + <div class="container" role="main"> + + <div class="row"> + + <!-- +Licensed to the Apache Software Foundation (ASF) under one +or more contributor license agreements. See the NOTICE file +distributed with this work for additional information +regarding copyright ownership. The ASF licenses this file +to you under the Apache License, Version 2.0 (the +"License"); you may not use this file except in compliance +with the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, +software distributed under the License is distributed on an +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +KIND, either express or implied. See the License for the +specific language governing permissions and limitations +under the License. +--> + +<div class="col-md-8 col-md-offset-2"> + <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 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 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 Create write proxy client builder</a></li> +<li><a class="reference internal" href="#enable-thrift-mux" id="id5">1.1.2 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 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 Build the write proxy client</a></li> +</ul> +</li> +<li><a class="reference internal" href="#write-records" id="id8">1.2 Write Records</a><ul class="auto-toc"> +<li><a class="reference internal" href="#create-a-recordset" id="id9">1.2.1 Create a RecordSet</a></li> +<li><a class="reference internal" href="#write-multiple-records" id="id10">1.2.2 Write multiple records</a></li> +<li><a class="reference internal" href="#write-the-recordset" id="id11">1.2.3 Write the RecordSet</a></li> +<li><a class="reference internal" href="#register-the-write-callback" id="id12">1.2.4 Register the write callback</a></li> +</ul> +</li> +<li><a class="reference internal" href="#close-the-write-proxy-client" id="id13">1.3 Close the write proxy client</a></li> +<li><a class="reference internal" href="#run-the-tutorial" id="id14">1.4 Run the tutorial</a><ul class="auto-toc"> +<li><a class="reference internal" href="#start-the-local-bookkeeper-cluster" id="id15">1.4.1 Start the local bookkeeper cluster</a></li> +<li><a class="reference internal" href="#start-the-write-proxy" id="id16">1.4.2 Start the write proxy</a></li> +<li><a class="reference internal" href="#create-the-stream" id="id17">1.4.3 Create the stream</a></li> +<li><a class="reference internal" href="#tail-the-stream" id="id18">1.4.4 Tail the stream</a></li> +<li><a class="reference internal" href="#id1" id="id19">1.4.5 Write records</a></li> +<li><a class="reference internal" href="#check-the-results" id="id20">1.4.6 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 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 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 Create write proxy client builder</a></h4> +<pre class="literal-block"> +DistributedLogClientBuilder builder = DistributedLogClientBuilder.newBuilder(); + .clientId(ClientId.apply("atomic-writer")) + .name("atomic-writer"); +</pre> +</div> +<div class="section" id="enable-thrift-mux"> +<h4><a class="toc-backref" href="#id5">1.1.2 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 Point the client to write proxy using finagle name</a></h4> +<pre class="literal-block"> +String finagleNameStr = "inet!127.0.0.1:8000"; +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 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 Write Records</a></h3> +<div class="section" id="create-a-recordset"> +<h4><a class="toc-backref" href="#id9">1.2.1 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 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<DLSN> writeFuture = new Promise<DLSN>(); + recordSetWriter.writeRecord(msgBuf, writeFuture); +} +</pre> +</div> +<div class="section" id="write-the-recordset"> +<h4><a class="toc-backref" href="#id11">1.2.3 Write the RecordSet</a></h4> +<p>Write the <cite>RecordSet</cite> to a stream.</p> +<pre class="literal-block"> +String streamName = "basic-stream-8"; +Future<DLSN> 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 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<DLSN>() { + @Override + public void onFailure(Throwable cause) { + // executed when write failed. + recordSetWriter.abortTransmit(cause); + } + + @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 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 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 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 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 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 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 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 "message-1" "message-2" "message-3" "message-4" "message-5" +</pre> +</div> +<div class="section" id="check-the-results"> +<h4><a class="toc-backref" href="#id20">1.4.6 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$$anonfun$resolvers$1 apply +INFO: Resolver[inet] = com.twitter.finagle.InetResolver(com.twitter.finagle.InetResolver@6c3e459e) +May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[fixedinet] = com.twitter.finagle.FixedInetResolver(com.twitter.finagle.FixedInetResolver@4d5698f) +May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[neg] = com.twitter.finagle.NegResolver$(com.twitter.finagle.NegResolver$@57052dc3) +May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[nil] = com.twitter.finagle.NilResolver$(com.twitter.finagle.NilResolver$@14ff89d7) +May 08, 2016 11:48:19 AM com.twitter.finagle.BaseResolver$$anonfun$resolvers$1 apply +INFO: Resolver[fail] = com.twitter.finagle.FailResolver$(com.twitter.finagle.FailResolver$@14b28d06) +May 08, 2016 11:48:19 AM com.twitter.finagle.Init$$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} +""" +message-1 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=1} +""" +message-2 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=2} +""" +message-3 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=3} +""" +message-4 +""" +Received record DLSN{logSegmentSequenceNo=1, entryId=0, slotId=4} +""" +message-5 +""" +</pre> +</div> +</div> +</div> + + +</div> + + + + </div> + + + <hr> + <div class="row"> + <div class="col-xs-12"> + <footer> + <p class="text-center">© Copyright 2016 + <a href="http://www.apache.org";>The Apache Software Foundation.</a> All Rights Reserved. + </p> + <p class="text-center"> + <a href="/docs/0.4.0-incubating/feed.xml">RSS Feed</a> + </p> + </footer> + </div> + </div> + <!-- container div end --> +</div> + + + <script> + (function () { + 'use strict'; + anchors.options.placement = 'right'; + anchors.add(); + })(); +</script> + + </body> + +</html> http://git-wip-us.apache.org/repos/asf/incubator-distributedlog/blob/ef7245e8/content/docs/0.4.0-incubating/tutorials/basic-5.html ---------------------------------------------------------------------- diff --git a/content/docs/0.4.0-incubating/tutorials/basic-5.html b/content/docs/0.4.0-incubating/tutorials/basic-5.html new file mode 100644 index 0000000..f2583db --- /dev/null +++ b/content/docs/0.4.0-incubating/tutorials/basic-5.html @@ -0,0 +1,578 @@ +<!DOCTYPE html> +<html lang="en"> + + <head> + <meta charset="utf-8"> + <meta http-equiv="X-UA-Compatible" content="IE=edge"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + + <title>API - Read Records</title> + <meta name="description" content="Apache DistributedLog is an high performance replicated log. +"> + + <link rel="stylesheet" href="/docs/0.4.0-incubating/styles/site.css"> + <link rel="stylesheet" href="/docs/0.4.0-incubating/css/theme.css"> + <!-- JQuery --> + <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js";></script> + <script src="/docs/0.4.0-incubating/js/bootstrap.min.js"></script> + <link rel="canonical" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/tutorials/basic-5.html"; data-proofer-ignore> + <link rel="alternate" type="application/rss+xml" title="Apache DistributedLog (incubating)" href="http://distributedlog.incubator.apache.org/docs/0.4.0-incubating/feed.xml";> + <!-- Font Awesome --> + <script src="//cdnjs.cloudflare.com/ajax/libs/anchor-js/3.2.0/anchor.min.js"></script> + <!-- Google Analytics --> + <script> + (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ + (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), + m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) + })(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); + + ga('create', 'UA-83870961-1', 'auto'); + ga('send', 'pageview'); + </script> + <!-- End Google Analytics --> + <link rel="shortcut icon" type="image/x-icon" href="/images/favicon.ico"> +</head> + + + <body role="document"> + + +<nav class="navbar navbar-default navbar-fixed-top"> + <div class="container"> + <div class="navbar-header"> + <a href="/" class="navbar-brand" > + <img alt="Brand" style="height: 28px" src="/docs/0.4.0-incubating/images/distributedlog_logo_navbar.png"> + </a> + <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> + <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 id="navbar" class="navbar-collapse collapse"> + <ul class="nav navbar-nav"> + <!-- Overview --> + <li><a href="/docs/0.4.0-incubating/">V0.4.0</a></li> + <!-- Concepts --> + <li><a href="/docs/0.4.0-incubating/basics/introduction">Concepts</a></li> + <!-- Quick Start --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Start<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + + + <li> + <a href="/docs/0.4.0-incubating/start/building.html"> + Build DistributedLog from Source + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/start/download.html"> + Download Releases + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Quickstart</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/start/quickstart.html"> + Setup & Run Example + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-1.html"> + API - Write Records (via core library) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-2.html"> + API - Write Records (via write proxy) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/basic-5.html"> + API - Read Records + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Deployment</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/deployment/cluster.html"> + Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/global-cluster.html"> + Global Cluster Setup + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/deployment/docker.html"> + Docker + </a> + </li> + + </ul> + </li> + <!-- API --> + <li> + <a href="/docs/0.4.0-incubating/start" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">API<span class="caret"></span></a> + <ul class="dropdown-menu" role="menu"> + <li><a href="/docs/0.4.0-incubating/api/java">Java</a></li> + </ul> + </li> + <!-- User Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">User Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + + + <li> + <a href="/docs/0.4.0-incubating/basics/introduction.html"> + Introduction + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/considerations/main.html"> + Considerations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/architecture/main.html"> + Architecture + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/api/main.html"> + API + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/configuration/main.html"> + Configuration + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/design/main.html"> + Detail Design + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/globalreplicatedlog/main.html"> + Global Replicated Log + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/implementation/main.html"> + Implementation + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/user_guide/references/main.html"> + References + </a> + </li> + + </ul> + </li> + <!-- Admin Guide --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Admin Guide<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li><a href="/docs/0.4.0-incubating/deployment/cluster">Cluster Setup</a></li> + + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/operations.html"> + Operations + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/performance.html"> + Performance Tuning + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/loadtest.html"> + Load Test + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/hardware.html"> + Hardware + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/monitoring.html"> + Monitoring + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/zookeeper.html"> + ZooKeeper + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/admin_guide/bookkeeper.html"> + BookKeeper + </a> + </li> + + </ul> + </li> + <!-- Tutorials --> + <li class="dropdown"> + <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Tutorials<span class="caret"></span></a> + <ul class="dropdown-menu"> + <li class="dropdown-header"><strong>Basic</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-1">Write Records (via Core Library)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-2">Write Records (via Write Proxy)</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-3">Write Records to multiple streams</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-4">Atomic Write Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-5">Tailing Read Records</a></li> + <li><a href="/docs/0.4.0-incubating/tutorials/basic-6">Rewind Read Records</a></li> + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Messaging</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-1.html"> + Write records to partitioned streams + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-2.html"> + Write records to multiple streams (load balancer) + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-3.html"> + At-least-once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-4.html"> + Exact-Once Processing + </a> + </li> + + <li> + <a href="/docs/0.4.0-incubating/tutorials/messaging-5.html"> + Implement a kafka-like pub/sub system + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Replicated State Machines</strong></li> + + + <li> + <a href="/docs/0.4.0-incubating/tutorials/replicatedstatemachines.html"> + Build replicated state machines + </a> + </li> + + <li role="separator" class="divider"></li> + <li class="dropdown-header"><strong>Analytics</strong></li> + <li><a href="/docs/0.4.0-incubating/tutorials/analytics-mapreduce">Process log streams using MapReduce</a></li> + </ul> + </li> + </ul> + </div><!--/.nav-collapse --> + </div> +</nav> + + +<link rel="stylesheet" href=""> + + + <div class="container" role="main"> + + <div class="row"> + + <!-- +Licensed to the Apache Software Foundation (ASF) under one +or more contributor license agreements. See the NOTICE file +distributed with this work for additional information +regarding copyright ownership. The ASF licenses this file +to you under the Apache License, Version 2.0 (the +"License"); you may not use this file except in compliance +with the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, +software distributed under the License is distributed on an +"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +KIND, either express or implied. See the License for the +specific language governing permissions and limitations +under the License. +--> + +<div class="col-md-8 col-md-offset-2"> + <div class="contents topic" id="basic-tutorial-tail-reading-records-from-a-stream"> +<p class="topic-title first">Basic Tutorial - Tail reading records from a stream</p> +<ul class="auto-toc simple"> +<li><a class="reference internal" href="#tail-reading-records-from-a-stream" id="id1">1 Tail reading records from a stream</a><ul class="auto-toc"> +<li><a class="reference internal" href="#open-a-distributedlog-manager" id="id2">1.1 Open a distributedlog manager</a><ul class="auto-toc"> +<li><a class="reference internal" href="#create-distributedlog-uri" id="id3">1.1.1 Create distributedlog URI</a></li> +<li><a class="reference internal" href="#create-distributedlog-configuration" id="id4">1.1.2 Create distributedlog configuration</a></li> +<li><a class="reference internal" href="#build-the-distributedlog-namespace" id="id5">1.1.3 Build the distributedlog namespace</a></li> +<li><a class="reference internal" href="#open-the-distributedlog-manager" id="id6">1.1.4 Open the distributedlog manager</a></li> +</ul> +</li> +<li><a class="reference internal" href="#get-last-record" id="id7">1.2 Get Last Record</a></li> +<li><a class="reference internal" href="#read-records" id="id8">1.3 Read Records</a><ul class="auto-toc"> +<li><a class="reference internal" href="#open-the-stream" id="id9">1.3.1 Open the stream</a></li> +<li><a class="reference internal" href="#read-the-records" id="id10">1.3.2 Read the records</a></li> +<li><a class="reference internal" href="#register-the-read-callback" id="id11">1.3.3 Register the read callback</a></li> +</ul> +</li> +<li><a class="reference internal" href="#close-the-reader" id="id12">1.4 Close the reader</a></li> +<li><a class="reference internal" href="#run-the-tutorial" id="id13">1.5 Run the tutorial</a><ul class="auto-toc"> +<li><a class="reference internal" href="#start-the-local-bookkeeper-cluster" id="id14">1.5.1 Start the local bookkeeper cluster</a></li> +<li><a class="reference internal" href="#start-the-write-proxy" id="id15">1.5.2 Start the write proxy</a></li> +<li><a class="reference internal" href="#create-the-stream" id="id16">1.5.3 Create the stream</a></li> +<li><a class="reference internal" href="#tail-the-stream" id="id17">1.5.4 Tail the stream</a></li> +<li><a class="reference internal" href="#write-records" id="id18">1.5.5 Write records</a></li> +<li><a class="reference internal" href="#check-the-results" id="id19">1.5.6 Check the results</a></li> +</ul> +</li> +</ul> +</li> +</ul> +</div> +<div class="section" id="tail-reading-records-from-a-stream"> +<h2><a class="toc-backref" href="#id1">1 Tail reading records from a stream</a></h2> +<p>This tutorial shows how to tail read records from a stream.</p> +<div class="section" id="open-a-distributedlog-manager"> +<h3><a class="toc-backref" href="#id2">1.1 Open a distributedlog manager</a></h3> +<div class="section" id="create-distributedlog-uri"> +<h4><a class="toc-backref" href="#id3">1.1.1 Create distributedlog URI</a></h4> +<pre class="literal-block"> +String dlUriStr = ...; +URI uri = URI.create(dlUriStr); +</pre> +</div> +<div class="section" id="create-distributedlog-configuration"> +<h4><a class="toc-backref" href="#id4">1.1.2 Create distributedlog configuration</a></h4> +<pre class="literal-block"> +DistributedLogConfiguration conf = new DistributedLogConfiguration(); +</pre> +</div> +<div class="section" id="build-the-distributedlog-namespace"> +<h4><a class="toc-backref" href="#id5">1.1.3 Build the distributedlog namespace</a></h4> +<pre class="literal-block"> +DistributedLogNamespace namespace = DistributedLogNamespaceBuilder.newBuilder() + .conf(conf) + .uri(uri) + .build(); +</pre> +</div> +<div class="section" id="open-the-distributedlog-manager"> +<h4><a class="toc-backref" href="#id6">1.1.4 Open the distributedlog manager</a></h4> +<pre class="literal-block"> +DistributedLogManager dlm = namespace.openLog("basic-stream-9"); +</pre> +</div> +</div> +<div class="section" id="get-last-record"> +<h3><a class="toc-backref" href="#id7">1.2 Get Last Record</a></h3> +<p>Get the last record from the record. From the last record, we can use <cite>DLSN</cite> of last record +to start tailing the stream.</p> +<pre class="literal-block"> +LogRecordWithDLSN record = dlm.getLastLogRecord(); +DLSN lastDLSN = record.getDlsn(); +</pre> +</div> +<div class="section" id="read-records"> +<h3><a class="toc-backref" href="#id8">1.3 Read Records</a></h3> +<div class="section" id="open-the-stream"> +<h4><a class="toc-backref" href="#id9">1.3.1 Open the stream</a></h4> +<p>Open the stream to start read the records.</p> +<pre class="literal-block"> +AsyncLogReader reader = FutureUtils.result(dlm.openAsyncLogReader(lastDLSN)); +</pre> +</div> +<div class="section" id="read-the-records"> +<h4><a class="toc-backref" href="#id10">1.3.2 Read the records</a></h4> +<p>Read the next available record from the stream. The future is satisified when the record is available.</p> +<pre class="literal-block"> +Future<LogRecordWithDLSN> readFuture = reader.readNext(); +</pre> +</div> +<div class="section" id="register-the-read-callback"> +<h4><a class="toc-backref" href="#id11">1.3.3 Register the read callback</a></h4> +<p>Register a future listener on read completion. The reader will be notified once the record is ready for consuming.</p> +<pre class="literal-block"> +final FutureEventListener<LogRecordWithDLSN> readListener = new FutureEventListener<LogRecordWithDLSN>() { + @Override + public void onFailure(Throwable cause) { + // executed when read failed. + } + + @Override + public void onSuccess(LogRecordWithDLSN record) { + // process the record + ... + // issue read next + reader.readNext().addEventListener(this); + } +}; +reader.readNext().addEventListener(readListener); +</pre> +</div> +</div> +<div class="section" id="close-the-reader"> +<h3><a class="toc-backref" href="#id12">1.4 Close the reader</a></h3> +<p>Close the reader after usage.</p> +<pre class="literal-block"> +FutureUtils.result(reader.asyncClose()); +</pre> +</div> +<div class="section" id="run-the-tutorial"> +<h3><a class="toc-backref" href="#id13">1.5 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="#id14">1.5.1 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="#id15">1.5.2 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="#id16">1.5.3 Create the stream</a></h4> +<p>Create the stream under the distributedlog uri.</p> +<pre class="literal-block"> +// Create Stream `basic-stream-9` +// 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 9 +</pre> +</div> +<div class="section" id="tail-the-stream"> +<h4><a class="toc-backref" href="#id17">1.5.4 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-9` +// 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-9 +</pre> +</div> +<div class="section" id="write-records"> +<h4><a class="toc-backref" href="#id18">1.5.5 Write records</a></h4> +<p>Run the example to write records to the stream in a console.</p> +<pre class="literal-block"> +// Write Records into Stream `basic-stream-9` +// runner run org.apache.distributedlog.basic.ConsoleProxyWriter ${distributedlog-uri} ${stream} +./distributedlog-tutorials/distributedlog-basic/bin/runner run org.apache.distributedlog.basic.ConsoleProxyWriter 'inet!127.0.0.1:8000' basic-stream-9 +</pre> +</div> +<div class="section" id="check-the-results"> +<h4><a class="toc-backref" href="#id19">1.5.6 Check the results</a></h4> +<p>Example output from <cite>ConsoleProxyWriter</cite> and <cite>TailReader</cite>.</p> +<pre class="literal-block"> +// 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] > test-proxy-writer +[dlog] > + + +// Output of `TailReader` +Opening log stream basic-stream-9 +Log stream basic-stream-9 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> +</div> + + +</div> + + + + </div> + + + <hr> + <div class="row"> + <div class="col-xs-12"> + <footer> + <p class="text-center">© Copyright 2016 + <a href="http://www.apache.org";>The Apache Software Foundation.</a> All Rights Reserved. + </p> + <p class="text-center"> + <a href="/docs/0.4.0-incubating/feed.xml">RSS Feed</a> + </p> + </footer> + </div> + </div> + <!-- container div end --> +</div> + + + <script> + (function () { + 'use strict'; + anchors.options.placement = 'right'; + anchors.add(); + })(); +</script> + + </body> + +</html>
