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https://issues.apache.org/jira/browse/FLINK-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636603#comment-14636603
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ASF GitHub Bot commented on FLINK-2391:
---------------------------------------
GitHub user ffbin opened a pull request:
https://github.com/apache/flink/pull/932
[FLINK-2391]Fix Storm-compatibility FlinkTopologyBuilder.createTopology bug
1.Error Scene:
Error happend in program like this:
builder.setSpout("source0", new Generator(pt),
pt.getInt("sourceParallelism"));
builder.setBolt("sa", new RepartPassThroughBolt(pt),
pt.getInt("sinkParallelism")).fieldsGrouping("source0", new Fields("id"));
builder.setBolt("sink", new Sink(pt),
pt.getInt("sinkParallelism")).fieldsGrouping("sa", new Fields("id"));
final FlinkLocalCluster cluster = FlinkLocalCluster.getLocalCluster();
cluster.submitTopology("throughput", conf, builder.createTopology());
if the last bolt use fieldsGrouping, createTopology will throw
NullPointerException.
2.Reason:
where get streaming group attribute index, it get downstream operator
outputFields,this is error。Because the last bolt has no
outputFields, so the outputSchema of declarer in null and throw
NullPointerException.
3.Modify:
where get streaming group attribute index, it get upstream operator
outputFields.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ffbin/flink FFB_Flink
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/932.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #932
----
commit e9c098670a14020d38f9b5e05442a2a606d90dcb
Author: ffbin <[email protected]>
Date: 2015-07-22T09:04:45Z
modify
----
> Storm-compatibility:method FlinkTopologyBuilder.createTopology() throws
> java.lang.NullPointerException
> ------------------------------------------------------------------------------------------------------
>
> Key: FLINK-2391
> URL: https://issues.apache.org/jira/browse/FLINK-2391
> Project: Flink
> Issue Type: Bug
> Components: flink-contrib
> Affects Versions: 0.10
> Environment: win7 32bit;linux
> Reporter: Huang Wei
> Labels: features
> Fix For: 0.10
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> core dumped at FlinkOutputFieldsDeclarer.java : 160(package
> FlinkOutputFieldsDeclarer).
> code : fieldIndexes[i] = this.outputSchema.fieldIndex(groupingFields.get(i));
> in this line, the var this.outputSchema may be null.
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