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From "Greg Hogan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-5890) GatherSumApply broken when object reuse enabled
Date Wed, 22 Feb 2017 21:07:44 GMT
Greg Hogan created FLINK-5890:

             Summary: GatherSumApply broken when object reuse enabled
                 Key: FLINK-5890
                 URL: https://issues.apache.org/jira/browse/FLINK-5890
             Project: Flink
          Issue Type: Bug
          Components: Gelly
    Affects Versions: 1.3.0
            Reporter: Greg Hogan
            Assignee: Greg Hogan
             Fix For: 1.3.0

{{GatherSumApplyIteration.SumUdf.reduce}} can store a value from {{arg1}} in the new {{Tuple2}}
which can be overwritten in {{ReduceDriver}}. We need to swap {{arg0.f1}} and {{arg1.f1}}
when this happens (as done in {{ReduceDriver}} for the returned results).

	public Tuple2<K, M> reduce(Tuple2<K, M> arg0, Tuple2<K, M> arg1) throws
Exception {
		K key = arg0.f0;
		M result = this.sumFunction.sum(arg0.f1, arg1.f1);
		return new Tuple2<>(key, result);

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