Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20386
`FileCommitProtocol.onTaskCommit` is called in `FileFormatWriter.write`, so
this PR is required to migrate file-based data sources.
By a quick look, it seems `FileCommitProtocol.onTaskCommit` doesn't have an
implementation yet, but I don't want to change the existing API and I assume
this API is necessary. BTW it sounds reasonable to provide a callback for task
commit.
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