Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/18111
I believe this patch implements the original design goal: if a committer
doesn't have a working path supplied by `getWorkingPath()` then it downgrades.
It might be worthwhile doing a larger fault-injecting committer at some
point. have indirectly the ability to inject faults, but its a long way from
the spark codebase, when really a thin shim is all that's needed. In
particular, if a fault injecting ParquetOutputCommitter would test a big chunk
of the codebase whose error handling codepaths are more likely to be tested in
production than by jenkins. Are people interested (separate JIRA, obviously)
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