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https://issues.apache.org/jira/browse/SPARK-15430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292682#comment-15292682
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Apache Spark commented on SPARK-15430:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/13211
> Access ListAccumulator's value could possibly cause
> java.util.ConcurrentModificationException
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-15430
> URL: https://issues.apache.org/jira/browse/SPARK-15430
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Liang-Chi Hsieh
>
> In ListAccumulator we create an unmodifiable view for underlying list.
> However, it doesn't prevent the underlying to be modified further. So as we
> access the unmodifiable list, the underlying list can be modified in the same
> time. It could cause java.util.ConcurrentModificationException. We should fix
> it.
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