Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6220#issuecomment-104082800
We might be able to add this to 1.4 if we feature-flag it as
off-by-default. We can recommend this as a replacement for `spark.cleaner.ttl`
in 1.4, then fully remove MetadataCleaner in 1.5 and enable this by default.
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