[jira] [Commented] (SPARK-20079) Re registration of AM hangs spark cluster in yarn-client mode

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-20079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16090854#comment-16090854 ] 

Apache Spark commented on SPARK-20079:
--------------------------------------

User 'vanzin' has created a pull request for this issue:
https://github.com/apache/spark/pull/18663

> Re registration of AM hangs spark cluster in yarn-client mode
> -------------------------------------------------------------
>
>                 Key: SPARK-20079
>                 URL: https://issues.apache.org/jira/browse/SPARK-20079
>             Project: Spark
>          Issue Type: Bug
>          Components: YARN
>    Affects Versions: 2.1.0
>            Reporter: Guoqiang Li
>
> The ExecutorAllocationManager.reset method is called when re-registering AM, which sets the ExecutorAllocationManager.initializing field true. When this field is true, the Driver does not start a new executor from the AM request. The following two cases will cause the field to False
> 1. A executor idle for some time.
> 2. There are new stages to be submitted
> After the a stage was submitted, the AM was killed and restart ,the above two cases will not appear.
> 1. When AM is killed, the yarn will kill all running containers. All execuotr will be lost and no executor will be idle.
> 2. No surviving executor, resulting in the current stage will never be completed, DAG will not submit a new stage.
> Reproduction steps:
> 1. Start cluster
> {noformat}
> echo -e "sc.parallelize(1 to 2000).foreach(_ => Thread.sleep(1000))" | ./bin/spark-shell  --master yarn-client --executor-cores 1 --conf spark.shuffle.service.enabled=true --conf spark.dynamicAllocation.enabled=true --conf spark.dynamicAllocation.maxExecutors=2
> {noformat}
> 2.  Kill the AM process when a stage is scheduled. 



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