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https://issues.apache.org/jira/browse/HIVE-19804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502541#comment-16502541
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Sergey Shelukhin commented on HIVE-19804:
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Sounds good to me
> msck repair should hold locks
> -----------------------------
>
> Key: HIVE-19804
> URL: https://issues.apache.org/jira/browse/HIVE-19804
> Project: Hive
> Issue Type: Improvement
> Reporter: Vihang Karajgaonkar
> Priority: Major
>
> {msck repair table <tablename>}} does not hold locks. This can lead to weird
> race conditions when concurrent sessions are running on the same table. For
> example if two sessions run msck on the same table at the same time, they
> both try to add partitions and they might both end up with failures due to
> AlreadyExistsException. Another example would be if a query is running on a
> partitioned table while some other session issues msck repair which add/drops
> the partitions, it could trigger errors during query execution.
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