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

["Patrick Wendell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-7689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Patrick Wendell updated SPARK-7689:
-----------------------------------
    Target Version/s: 1.4.1  (was: 1.4.0)

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