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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, 01 Dec 2015 14:31:11 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15033755#comment-15033755
] 

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_r46284023
  
    --- Diff: flink-contrib/flink-storm/src/main/java/org/apache/flink/storm/wrappers/BoltWrapper.java
---
    @@ -89,13 +99,9 @@ public BoltWrapper(final IRichBolt bolt) throws IllegalArgumentException
{
     	 * used within a Flink streaming program. The given input schema enable attribute-by-name
access for input types
     	 * {@link Tuple0} to {@link Tuple25}. The output type will be one of {@link Tuple0}
to {@link Tuple25} depending on
     	 * the bolt's declared number of attributes.
    -	 * 
    -	 * @param bolt
    -	 *            The Storm {@link IRichBolt bolt} to be used.
    +	 * @param bolt The Storm {@link IRichBolt bolt} to be used.
     	 * @param inputSchema
    -	 *            The schema (ie, ordered field names) of the input stream.
    -	 * @throws IllegalArgumentException
    --- End diff --
    
    Please keep `@throws`


> 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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