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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2837) FlinkTopologyBuilder cannot handle multiple input streams
Date Tue, 24 Nov 2015 12:07:11 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15024351#comment-15024351
] 

ASF GitHub Bot commented on FLINK-2837:
---------------------------------------

Github user mjsax commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1398#discussion_r45726840
  
    --- Diff: flink-contrib/flink-storm/src/main/java/org/apache/flink/storm/wrappers/BoltWrapper.java
---
    @@ -75,11 +78,13 @@
     	 * 
     	 * @param bolt
     	 *            The Storm {@link IRichBolt bolt} to be used.
    +	 * @param componentId
    +	 * @param streamId
     	 * @throws IllegalArgumentException
     	 *             If the number of declared output attributes is not with range [0;25].
     	 */
    -	public BoltWrapper(final IRichBolt bolt) throws IllegalArgumentException {
    -		this(bolt, null, (Collection<String>) null);
    +	public BoltWrapper(final IRichBolt bolt, String componentId, String streamId) throws
IllegalArgumentException {
    +		this(bolt, componentId, streamId, null, (Collection<String>) null);
    --- End diff --
    
    This makes the interface quite hard to use and should not be necessary. The `TopologyContext`
created in `open()` contains this information.


> 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: Maximilian Michels
>
> 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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