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Posted to issues@hive.apache.org by "Eugene Koifman (JIRA)" <ji...@apache.org> on 2017/08/24 23:19:00 UTC

[jira] [Commented] (HIVE-17340) TxnHandler.checkLock() - reduce number of SQL statements

    [ https://issues.apache.org/jira/browse/HIVE-17340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16140913#comment-16140913 ] 

Eugene Koifman commented on HIVE-17340:
---------------------------------------

@Wei Zheng could you review please

> TxnHandler.checkLock() - reduce number of SQL statements
> --------------------------------------------------------
>
>                 Key: HIVE-17340
>                 URL: https://issues.apache.org/jira/browse/HIVE-17340
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>         Attachments: HIVE-17340.03.patch
>
>
> This calls acquire(Connection dbConn, Statement stmt, long extLockId, LockInfo lockInfo)
> for each lock in the same DB transaction - 1 Update stmt per acquire().
> There is no reason all of them cannot be sent in 1 statement if all the locks are granted
> With a lot of partitions this can be a perf issue



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