Robin Wolters created SPARK-29861:
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Summary: Reduce leader election downtime in Spark standalone HA
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
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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