[jira] [Commented] (SPARK-16554) Spark should kill executors when they are blacklisted

["Mridul Muralidharan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-16554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15703851#comment-15703851 ] 

Mridul Muralidharan commented on SPARK-16554:
---------------------------------------------

It would also be good if we can also move currently hosted blocks off the node before it is killed as a best case effort.
This will reduce recomputation (if single copy of rdd block) and/or prevent under replication (if block replication > 1)

> Spark should kill executors when they are blacklisted
> -----------------------------------------------------
>
>                 Key: SPARK-16554
>                 URL: https://issues.apache.org/jira/browse/SPARK-16554
>             Project: Spark
>          Issue Type: New Feature
>          Components: Scheduler
>            Reporter: Imran Rashid
>
> SPARK-8425 will allow blacklisting faulty executors and nodes.  However, these blacklisted executors will continue to run.  This is bad for a few reasons:
> (1) Even if there is faulty-hardware, if the cluster is under-utilized spark may be able to request another executor on a different node.
> (2) If there is a faulty-disk (the most common case of faulty-hardware), the cluster manager may be able to allocate another executor on the same node, if it can exclude the bad disk.  (Yarn will do this with its disk-health checker.)
> With dynamic allocation, this may seem less critical, as a blacklisted executor will stop running new tasks and eventually get reclaimed.  However, if there is cached data on those executors, they will not get killed till {{spark.dynamicAllocation.cachedExecutorIdleTimeout}} expires, which is (effectively) infinite by default.
> Users may not *always* want to kill bad executors, so this must be configurable to some extent.  At a minimum, it should be possible to enable / disable it; perhaps the executor should be killed after it has been blacklisted a configurable {{N}} times.



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