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From "liyunzhang_intel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-16675) Fix ConcurrentModificationException in SparkClientImpl#startDriver
Date Tue, 16 May 2017 08:28:04 GMT
liyunzhang_intel created HIVE-16675:
---------------------------------------

             Summary: Fix ConcurrentModificationException in SparkClientImpl#startDriver
                 Key: HIVE-16675
                 URL: https://issues.apache.org/jira/browse/HIVE-16675
             Project: Hive
          Issue Type: Bug
            Reporter: liyunzhang_intel
            Assignee: liyunzhang_intel


the exception is
{noformat}
              2017-05-16T00:29:37,480  WARN [Driver] client.SparkClientImpl: Exception while
waiting for child process.
              3926 java.util.ConcurrentModificationException
              3927         at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
~[?:1.8.0_91]
              3928         at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[?:1.8.0_91]
              3929         at org.apache.hive.spark.client.SparkClientImpl$3.run(SparkClientImpl.java:495)
[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
              3930         at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
{noformat}

It seems that {{SparkClientImpl.java#childErrorLog}} is read while it is written. It is better
to change {{SparkClientImpl.java#childErrorLog}} from ArrayList to CopyOnWriteArrayList to
avoid the exception.



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