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https://issues.apache.org/jira/browse/SPARK-15430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-15430:
------------------------------
    Assignee: Liang-Chi Hsieh

> 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
>            Assignee: Liang-Chi Hsieh
>             Fix For: 2.0.0
>
>
> 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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