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https://issues.apache.org/jira/browse/HIVE-9243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14264179#comment-14264179
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Brock Noland commented on HIVE-9243:
------------------------------------

Latest patch does the cleanup and adds comments about which engines use which 
data structures.

> Static Map in IOContext is not thread safe
> ------------------------------------------
>
>                 Key: HIVE-9243
>                 URL: https://issues.apache.org/jira/browse/HIVE-9243
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.15.0
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>         Attachments: HIVE-9243.patch, HIVE-9243.patch, HIVE-9243.patch
>
>
> This map can be accessed by multiple threads. We can either map it a 
> {{ConcurrentHashMap}} or synchronize the calls to this class.



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