Github user tdas commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20710#discussion_r171993622
  
    --- Diff: 
sql/core/src/main/java/org/apache/spark/sql/sources/v2/writer/DataWriterFactory.java
 ---
    @@ -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
    --- End diff --
    
    For non-streaming queries, this...


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