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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-19617) Fix the race condition when starting and stopping a query quickly
Date Sat, 18 Feb 2017 03:13:44 GMT

    [ https://issues.apache.org/jira/browse/SPARK-19617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15872948#comment-15872948
] 

Apache Spark commented on SPARK-19617:
--------------------------------------

User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/16979

> Fix the race condition when starting and stopping a query quickly
> -----------------------------------------------------------------
>
>                 Key: SPARK-19617
>                 URL: https://issues.apache.org/jira/browse/SPARK-19617
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.0.2, 2.1.0
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>
> The streaming thread in StreamExecution uses the following ways to check if it should
exit:
> - Catch an InterruptException.
> - `StreamExecution.state` is TERMINATED.
> when starting and stopping a query quickly, the above two checks may both fail.
> - Hit [HADOOP-14084|https://issues.apache.org/jira/browse/HADOOP-14084] and swallow InterruptException
> - StreamExecution.stop is called before `state` becomes `ACTIVE`. Then [runBatches|https://github.com/apache/spark/blob/dcc2d540a53f0bd04baead43fdee1c170ef2b9f3/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala#L252]
changes the state from `TERMINATED` to `ACTIVE`.
> If the above cases both happen, the query will hang forever.



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