Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22112
@tgravescs The `FileCommitProtocol` is an internal API, and our current
implementation does store task-level data temporary in a staging directory (See
`HadoopMapReduceCommitProtocol`). That said, we can fix the
`FileCommitProtocol` to be able to rollback a committed task, as long as the
job is not committed.
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