[jira] [Commented] (SPARK-18820) Driver may send "LaunchTask" before executor receive "RegisteredExecutor"

["Shuai Lin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15739970#comment-15739970 ] 

Shuai Lin commented on SPARK-18820:
-----------------------------------

The driver first sends {{RegisteredExecutor}} message and then, if there is a task scheduled to run on this executor, sends the {{LaunchTask}} message, both through the same underlying netty channel. So I think the order is guaranteed, and the problem described would never happen.

> Driver may send "LaunchTask" before executor receive "RegisteredExecutor"
> -------------------------------------------------------------------------
>
>                 Key: SPARK-18820
>                 URL: https://issues.apache.org/jira/browse/SPARK-18820
>             Project: Spark
>          Issue Type: Bug
>          Components: Scheduler
>    Affects Versions: 1.6.3
>         Environment: spark-1.6.3
>            Reporter: jin xing
>
> CoarseGrainedSchedulerBackend will update executorDataMap after receiving "RegisterExecutor", thus task scheduler may assign tasks on to this executor;
> If LaunchTask arrives at CoarseGrainedExecutorBackend before RegisteredExecutor, it will result in NullPointerException and executor backend will exit;
> Is it a bug? If so can I make a pr? I think driver should send "LaunchTask" after "RegisteredExecutor" is already received.



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