Github user tdas commented on a diff in the pull request:
    --- Diff: 
    @@ -48,6 +48,9 @@
        *                      same task id but different attempt number, which 
means there are multiple
        *                      tasks with the same task id running at the same 
time. Implementations can
        *                      use this attempt number to distinguish writers 
of different task attempts.
    +   * @param epochId A monotonically increasing id for streaming queries 
that are split in to
    +   *                discrete periods of execution. For queries that 
execute as a single batch, this
    +   *                id will always be zero.
    -  DataWriter<T> createDataWriter(int partitionId, int attemptNumber);
    +  DataWriter<T> createDataWriter(int partitionId, int attemptNumber, long 
    --- End diff --
    Add clear lifecycle semantics.


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