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Posted to dev@flink.apache.org by "sunjincheng (JIRA)" <ji...@apache.org> on 2016/11/21 08:24:58 UTC

[jira] [Created] (FLINK-5105) Improve ReduceState: value put into ReducingState should always be a copy

sunjincheng created FLINK-5105:
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             Summary: Improve ReduceState: value put into ReducingState should always be a copy
                 Key: FLINK-5105
                 URL: https://issues.apache.org/jira/browse/FLINK-5105
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
            Reporter: sunjincheng


 In case of overlapping sliding windows, multiple references are hold on the same object. If we modify value1 or value2 the results are incorrect.  The value that is put into a ReducingState is always copied. That would allow to modify and emit one of the two input values (the one which is comes from the state).
The FoldingState has the same problem.



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