Apache Spark commented on SPARK-17365:

User 'dhruve' has created a pull request for this issue:

> Kill multiple executors together to reduce lock contention
> ----------------------------------------------------------
>                 Key: SPARK-17365
>                 URL: https://issues.apache.org/jira/browse/SPARK-17365
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Dhruve Ashar
> To regulate pending and running executors we determine the executors which 
> are eligible to kill and kill them iteratively rather than a loop. This does 
> an RPC call and is synchronized leading to lock contention for 
> SparkListenerBus. 
> Side effect - listener bus is blocked while we iteratively remove executors.

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