[jira] [Created] (SPARK-7689) Deprecate spark.cleaner.ttl

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-7689:
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             Summary: Deprecate spark.cleaner.ttl
                 Key: SPARK-7689
                 URL: https://issues.apache.org/jira/browse/SPARK-7689
             Project: Spark
          Issue Type: Improvement
            Reporter: Josh Rosen


With the introduction of ContextCleaner, I think there's no longer any reason for most users to enable the MetadataCleaner / {{spark.cleaner.ttl}} (except perhaps for super-long-lived Spark REPLs where you're worried about orphaning RDDs or broadcast variables in your REPL history and having them never get cleaned up, although I think this is an uncommon use-case).  I think that this property used to be relevant for Spark Streaming jobs, but I think that's no longer the case since the latest Streaming docs have removed all mentions of {{spark.cleaner.ttl}} (see https://github.com/apache/spark/pull/4956/files#diff-dbee746abf610b52d8a7cb65bf9ea765L1817, for example).

See http://apache-spark-user-list.1001560.n3.nabble.com/is-spark-cleaner-ttl-safe-td2557.html for an old, related discussion.  Also, see https://github.com/apache/spark/pull/126, the PR that introduced the new ContextCleaner mechanism.

We should probably add a deprecation warning to {{spark.cleaner.ttl}} that advises users against using it, since it's an unsafe configuration option that can lead to confusing behavior if it's misused.



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