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Posted to common-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2018/04/03 14:21:00 UTC

[jira] [Reopened] (HADOOP-13500) Concurrency issues when using Configuration iterator

     [ https://issues.apache.org/jira/browse/HADOOP-13500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Lowe reopened HADOOP-13500:
---------------------------------

This is not a duplicate of HADOOP-13556.  That JIRA only changed the getPropsWithPrefix method which was not involved in the error reported by this JIRA or TEZ-3413.  AFAICT iterating a shared configuration object is still unsafe.

> Concurrency issues when using Configuration iterator
> ----------------------------------------------------
>
>                 Key: HADOOP-13500
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13500
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>            Reporter: Jason Lowe
>            Assignee: Ajay Kumar
>            Priority: Major
>
> It is possible to encounter a ConcurrentModificationException while trying to iterate a Configuration object.  The iterator method tries to walk the underlying Property object without proper synchronization, so another thread simultaneously calling the set method can trigger it.



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