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https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15072743#comment-15072743
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Maximilian Michels commented on FLINK-2837:
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It is not strictly enforced if no design document has been requested. However,
it is always good to let someone else look through the code. Especially, if the
design choices have not been discussed publicly in advance. That also ensures
people can discuss the changes and adapt each other's code to the upcoming
changes.
> 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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