[jira] [Created] (SPARK-25822) Fix a race condition when releasing a Python worker

["Shixiong Zhu (JIRA)" <ji...@apache.org>]

Shixiong Zhu created SPARK-25822:
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             Summary: Fix a race condition when releasing a Python worker
                 Key: SPARK-25822
                 URL: https://issues.apache.org/jira/browse/SPARK-25822
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 2.3.2
            Reporter: Shixiong Zhu
            Assignee: Shixiong Zhu


There is a race condition when releasing a Python worker. If "ReaderIterator.handleEndOfDataSection" is not running in the task thread, when a task is early terminated (such as "take(N)"), the task completion listener may close the worker but "handleEndOfDataSection" can still put the worker into the worker pool to reuse.

https://github.com/zsxwing/spark/commit/0e07b483d2e7c68f3b5c3c118d0bf58c501041b7 is a patch to reproduce this issue.

I also found a user reported this in the mail list: http://mail-archives.apache.org/mod_mbox/spark-user/201610.mbox/%3CCAAUq=H+YLUEpd23nwvq13Ms5hOStkhX3ao4f4zQV6sgO5zM-xA@mail.gmail.com%3E



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