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https://issues.apache.org/jira/browse/HIVE-19416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16510309#comment-16510309
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Sergey Shelukhin commented on HIVE-19416:
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Another concern is that the code that gets the snapshot looks like it may
affect locks/etc (LockException was added) or get write Ids outside where they
are normally retrieved (in stats optimizer).
I think optimizer runs before the locks are obtained, so this can lead to
deadlocks if locks are obtained piecemeal, and also to some consistency issues
I assume. It's not clear what to do to get correct/incorrect stats info for it,
without the locks. Maybe locks would have to be moved before the optimizer. cc
[~ekoifman]
> Create single version transactional table metastore statistics for
> aggregation queries
> --------------------------------------------------------------------------------------
>
> Key: HIVE-19416
> URL: https://issues.apache.org/jira/browse/HIVE-19416
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Reporter: Steve Yeom
> Assignee: Steve Yeom
> Priority: Major
>
> The system should use only statistics for aggregation queries like count on
> transactional tables.
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