Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/6220#issuecomment-103202988
I wonder if we should optionally do the `System.gc()` internally ourselves
to trigger clean up. I am in full favor of deprecating or even removing
`spark.cleaner.ttl` completely, but maybe we should introduce the periodic
driver GC mechanism as an alternative for streaming applications.
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