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From "Maximilian Michels (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2837) FlinkTopologyBuilder cannot handle multiple input streams
Date Mon, 28 Dec 2015 11:19:49 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15072645#comment-15072645
] 

Maximilian Michels commented on FLINK-2837:
-------------------------------------------

Thanks for the fix. Looks good but could you open a pull request next time?

> FlinkTopologyBuilder cannot handle multiple input streams
> ---------------------------------------------------------
>
>                 Key: FLINK-2837
>                 URL: https://issues.apache.org/jira/browse/FLINK-2837
>             Project: Flink
>          Issue Type: Bug
>          Components: Storm Compatibility
>            Reporter: Matthias J. Sax
>            Assignee: Matthias J. Sax
>
> FlinkTopologyBuilder cannot handle multiple input streams correctly. Instead of union
the incoming streams, it replicates the consuming bolt and each (logical) instance processes
one of the input streams.
> For example:
> {noformat}
> final FlinkTopologyBuilder builder = new FlinkTopologyBuilder();
> builder.setSpout(spoutId1, new FiniteRandomSpout(0, 10));
> builder.setSpout(spoutId2, new FiniteRandomSpout(1, 8));
> builder.setSpout(spoutId3, new FiniteRandomSpout(2, 13));
> builder.setBolt(boltId, new MergerBolt())
> 	.shuffleGrouping(spoutId1)
> 	.shuffleGrouping(spoutId2)
> 	.shuffleGrouping(spoutId3);
> builder.setBolt("sink", new BoltPrintSink(new SimpleOutputFormatter()))
> 	.shuffleGrouping(boltId);
> {noformat}
> will only print the data from a single source instead of all sources.



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