Github user rdblue commented on the issue: https://github.com/apache/spark/pull/20386 @gengliangwang, what is the use case supported by this? In other words, how is `onTaskCommit(taskCommit: TaskCommitMessage)` currently used that requires this change? In general, I'm more concerned with the batch side and I don't have a huge problem with this change. I do want to make sure it is in support of a valid use case. I'd also rather separate the batch and streaming committer APIs because they have so little in common.
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