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https://issues.apache.org/jira/browse/SPARK-29861?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robin Wolters updated SPARK-29861:
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Summary: Reduce downtime in Spark standalone HA master switch (was: Reduce
leader election downtime in Spark standalone HA)
> Reduce downtime in Spark standalone HA master switch
> ----------------------------------------------------
>
> Key: SPARK-29861
> URL: https://issues.apache.org/jira/browse/SPARK-29861
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.2.1
> Reporter: Robin Wolters
> Priority: Minor
>
> As officially stated in the spark [HA
> documention|https://spark.apache.org/docs/latest/spark-standalone.html#standby-masters-with-zookeeper],
> the recovery process of Spark (standalone) master in HA with zookeeper takes
> about 1-2 minutes. During this time no spark master is active, which makes
> interaction with spark essentially impossible.
> After looking for a way to reduce this downtime, it seems that this is mainly
> caused by the leader election, which waits for open zookeeper connections to
> be closed. This seems like an unnecessary downtime for example in case of a
> planned VM update.
> I have fixed this in my setup by:
> # Closing open zookeeper connections during spark shutdown
> # Bumping the curator version and implementing a custom error policy that is
> tolerant to a zookeeper connection suspension.
> I am preparing a pull request for review / further discussion on this issue.
>
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