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Yang, Tong
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Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Yang, Tong <yangtong2@huawei.com> Co-committed-by: Yang, Tong <yangtong2@huawei.com>
30 lines
2.1 KiB
HTML
30 lines
2.1 KiB
HTML
<a name="mrs_01_1051"></a><a name="mrs_01_1051"></a>
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<h1 class="topictitle1">Performing Embedded Service Migration</h1>
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<div id="body1590370637070"><div class="section" id="mrs_01_1051__section159162041122612"><h4 class="sectiontitle">Scenarios</h4><p id="mrs_01_1051__p154642112610">This section describes how to embed Storm code in DataStream of Flink in embedded migration mode. For example, the code of Spout or Bolt compiled using Storm API is embedded.</p>
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</div>
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<div class="section" id="mrs_01_1051__section9917241182615"><h4 class="sectiontitle">Procedure</h4><ol id="mrs_01_1051__ol9412429269"><li id="mrs_01_1051__li1441742102610"><span>In Flink, perform embedded conversion to Spout and Bolt in the Storm topology to convert them to Flink operators. The following is an example of the code:</span><p><pre class="screen" id="mrs_01_1051__screen164114219265">//set up the execution environment
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final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
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//get input data
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final DataStream<String> text = getTextDataStream(env);
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final DataStream<Tuple2<String, Integer>> counts = text
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//split up the lines in pairs (2-tuples) containing: (word,1)
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//this is done by a bolt that is wrapped accordingly
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.transform("CountBolt",
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TypeExtractor.getForObject(new Tuple2<String, Integer>("", 0)),
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new BoltWrapper<String, Tuple2<String, Integer>>(new CountBolt()))
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//group by the tuple field "0" and sum up tuple field "1"
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.keyBy(0).sum(1);
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// execute program
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env.execute("Streaming WordCount with bolt tokenizer");</pre>
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</p></li><li id="mrs_01_1051__li124242182619"><span>After the modification, run the following command to submit the modification:</span><p><p id="mrs_01_1051__p54124222616"><strong id="mrs_01_1051__b1344424263">flink run -class {MainClass} WordCount.jar</strong></p>
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</p></li></ol>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="mrs_01_1048.html">Migrating Storm Services to Flink</a></div>
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</div>
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</div>
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