Github user mwws commented on the pull request:
https://github.com/apache/spark/pull/11101#issuecomment-183796117
@zsxwing, we have real use case that data integrity is important, but at
the same time, we can not afford extra time cost of WAL with limited data
processing power/host. (Batch processing time is already very closed to
BatchInterval at peak time.)
And anyway, this PR is making the best effort to avoid data losing with
little overhead. I think it's worth to do.
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