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| <div class="section" id="best-practices"> |
| <h1>Best Practices<a class="headerlink" href="#best-practices" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="write-records-using-fat-client-or-thin-client"> |
| <h2>Write records using Fat Client or Thin Client<a class="headerlink" href="#write-records-using-fat-client-or-thin-client" title="Permalink to this headline">¶</a></h2> |
| <p><cite>Fat Client</cite> is the writer in distributedlog core library which talks to ZooKeeper and BookKeeper directly, |
| while <cite>Thin Client</cite> is the write proxy client which talks to write proxy service.</p> |
| <p>It is strongly recommended that writing records via <cite>Write Proxy</cite> service rather than using core library directly. |
| Because using <cite>Thin Client</cite> has following benefits:</p> |
| <ul class="simple"> |
| <li><cite>Thin Client</cite> is purely thrift RPC based client. It doesn't talk to zookeeper and bookkeeper directly and less complicated.</li> |
| <li><cite>Write Proxy</cite> manages ownerships of log writers. <cite>Thin Client</cite> doesn't have to deal with ownerships of log writers.</li> |
| <li><cite>Thin Client</cite> is more upgrade-friendly than <cite>Fat Client</cite>.</li> |
| </ul> |
| <p>The only exception to use distributedlog core library directly is when you application requires:</p> |
| <ul class="simple"> |
| <li>Write Ordering. <cite>Write Ordering</cite> means all the writes issued by the writer should be written in a strict order |
| in the log. <cite>Write Proxy</cite> service could only guarantee <cite>Read Ordering</cite>. <cite>Read Ordering</cite> means the write proxies will write |
| the write requests in their receiving order and gurantee the data seen by all the readers in same order.</li> |
| <li>Ownership Management. If the application already has any kind of ownership management, like <cite>master-slave</cite>, it makes more |
| sense that it uses distributedlog core library directly.</li> |
| </ul> |
| </div> |
| <div class="section" id="how-to-position-reader-by-time"> |
| <h2>How to position reader by time<a class="headerlink" href="#how-to-position-reader-by-time" title="Permalink to this headline">¶</a></h2> |
| <p>Sometimes, application wants to read data by time, like read data from 2 hours ago. This could be done by positioning |
| the reader using <cite>Transaction ID</cite>, if the <cite>Transaction ID</cite> is the timestamp (All the streams produced by <cite>Write Proxy</cite> use |
| timestamp as <cite>Transaction ID</cite>).</p> |
| <div class="highlight-python"><pre>DistributedLogManager dlm = ...; |
| |
| long timestamp = System.currentTimeMillis(); |
| long startTxId = timestamp - TimeUnit.MILLISECONDS.convert(2, TimeUnit.HOURS); |
| AsyncLogReader reader = Await.result(dlm.openAsyncLogReader(startTxId)); |
| ...</pre> |
| <div style='display:none;' class='raw-code'><pre>DistributedLogManager dlm = ...; |
| |
| long timestamp = System.currentTimeMillis(); |
| long startTxId = timestamp - TimeUnit.MILLISECONDS.convert(2, TimeUnit.HOURS); |
| AsyncLogReader reader = Await.result(dlm.openAsyncLogReader(startTxId)); |
| ...</pre> |
| </div></div> |
| </div> |
| <div class="section" id="how-to-seal-a-stream"> |
| <h2>How to seal a stream<a class="headerlink" href="#how-to-seal-a-stream" title="Permalink to this headline">¶</a></h2> |
| <p>Typically, DistributedLog is used as endless streams. In some use cases, application wants to <cite>seal</cite> the stream. So writers |
| can't write more data into the log stream and readers could receive notifications about the stream has been sealed.</p> |
| <p>Write could seal a log stream as below:</p> |
| <div class="highlight-python"><pre>DistributedLogManager dlm = ...; |
| |
| LogWriter writer = dlm.startLogSegmentNonPartitioned; |
| // writer writes bunch of records |
| ... |
| |
| // writer seals the stream |
| writer.markEndOfStream();</pre> |
| <div style='display:none;' class='raw-code'><pre>DistributedLogManager dlm = ...; |
| |
| LogWriter writer = dlm.startLogSegmentNonPartitioned; |
| // writer writes bunch of records |
| ... |
| |
| // writer seals the stream |
| writer.markEndOfStream();</pre> |
| </div></div> |
| <p>Reader could detect a stream has been sealed as below:</p> |
| <div class="highlight-python"><pre>DistributedLogManager dlm = ...; |
| |
| LogReader reader = dlm.getInputStream(1L); |
| LogRecord record; |
| try { |
| while ((record = reader.readNext(false)) != null) { |
| // process the record |
| ... |
| } |
| } catch (EndOfStreamException eos) { |
| // the stream has been sealed |
| ... |
| }</pre> |
| <div style='display:none;' class='raw-code'><pre>DistributedLogManager dlm = ...; |
| |
| LogReader reader = dlm.getInputStream(1L); |
| LogRecord record; |
| try { |
| while ((record = reader.readNext(false)) != null) { |
| // process the record |
| ... |
| } |
| } catch (EndOfStreamException eos) { |
| // the stream has been sealed |
| ... |
| }</pre> |
| </div></div> |
| </div> |
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| <li class="toctree-l2"><a class="reference internal" href="../design/main.html#streaming-reads">Streaming Reads</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../design/main.html#logsegment-lifecycle">LogSegment Lifecycle</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../globalreplicatedlog/main.html">Global Replicated Log</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#region-aware-data-placement-policy">Region Aware Data Placement Policy</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#cross-region-speculative-reads">Cross Region Speculative Reads</a></li> |
| </ul> |
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| <li class="toctree-l1"><a class="reference internal" href="../implementation/main.html">Implementation</a><ul> |
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| <li class="toctree-l2"><a class="reference internal" href="../operations/deployment.html">Cluster Setup & Deployment</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#basic">Basic</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#messaging">Messaging</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#replicated-state-machines">Replicated State Machines</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#analytics">Analytics</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../developer/release.html">Release</a></li> |
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| TimeMe.setIdleDurationInSeconds(30); |
| TimeMe.setCurrentPageName("my-home-page"); |
| TimeMe.initialize(); |
| |
| // record page visit event when user leaves the page |
| window.onbeforeunload = function (event) { |
| xmlhttp=new XMLHttpRequest(); |
| xmlhttp.withCredentials = true; |
| xmlhttp.open("POST", "/event/distributedlog:distributedlog/visit", false); |
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| background-color: #fff; |
| border: 1px solid #ccc; |
| position: fixed; |
| bottom: 3px; |
| right: -280px; |
| z-index: 1; |
| } |
| #slidebox .close{ |
| margin-top: -5px; |
| opacity: 0.5; |
| } |
| #slidebox .close:hover{ |
| opacity: 0.7; |
| } |
| </style> --> |
| <script type="text/javascript"> |
| $(function() { |
| // $(window).scroll(function(){ |
| // var distanceTop = $('#last').offset().top - $(window).height(); |
| |
| // if ($(window).scrollTop() > distanceTop) |
| // $('#slidebox').animate({'right':'3px'},300); |
| // else |
| // $('#slidebox').stop(true).animate({'right':'-280px'},100); |
| // }); |
| |
| // $('#slidebox .close').bind('click',function(){ |
| // $(this).parent().remove(); |
| // }); |
| |
| $("#rateYo").rateYo({ |
| normalFill: "#A0A0A0", |
| halfStar: true, |
| rating: (Cookies.get('docbird.rating.distributedlog.distributedlog') || 0.0) |
| }).on("rateyo.set", function (e, data) { |
| var event_data = { |
| comment: '', // see todo note below |
| rating: data.rating, |
| page: window.location.href |
| }; |
| Cookies.get('docbird.rating.distributedlog.distributedlog', data.rating) |
| $.post('/event/distributedlog:distributedlog/rating', event_data) |
| // xmlhttp=new XMLHttpRequest(); |
| // xmlhttp.withCredentials = true; |
| // var event_data = { |
| // comment: '', // see todo note below |
| // rating: data.rating, |
| // page: window.location.href |
| // }; |
| // xmlhttp.open("GET", "/event/distributedlog/rating?" + $.param(event_data), false); |
| // xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); |
| // // todo: implement comment form in rating slide out, |
| // // and instead of hooking this event, include a submit button, |
| // // and read the rating with rating() method |
| |
| // // alert("send: " + $.param(event_data)); |
| // xmlhttp.send(); |
| |
| }); |
| |
| }); |
| </script> |
| <script src="_static/js/selection-sharer.js"></script> |
| <script> |
| $('.db-content-body').selectionSharer(); |
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