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From "Sushanth Sowmyan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10521) TxnHandler.timeOutTxns only times out some of the expired transactions
Date Tue, 28 Apr 2015 22:01:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518179#comment-14518179
] 

Sushanth Sowmyan commented on HIVE-10521:
-----------------------------------------

Approved for 1.2 pending tests, Eugene's review & commit to master.

I've added it to the list here : https://cwiki.apache.org/confluence/display/Hive/Hive+1.2+Release+Status

> TxnHandler.timeOutTxns only times out some of the expired transactions
> ----------------------------------------------------------------------
>
>                 Key: HIVE-10521
>                 URL: https://issues.apache.org/jira/browse/HIVE-10521
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 0.14.0, 1.0.0, 1.1.0
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: HIVE-10521.patch
>
>
> {code}
>       for (int i = 0; i < 20 && rs.next(); i++) deadTxns.add(rs.getLong(1));
>       // We don't care whether all of the transactions get deleted or not,
>       // if some didn't it most likely means someone else deleted them in the interum
>       if (deadTxns.size() > 0) abortTxns(dbConn, deadTxns);
> {code}
> While it makes sense to limit the number of transactions aborted in one pass (since this
get's translated to an IN clause) we should still make sure all are timed out.  Also, 20 seems
pretty small as a batch size.



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