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| <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> |
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