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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13013) Further Improve concurrency in TxnHandler
Date Thu, 25 Feb 2016 19:38:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15167725#comment-15167725
] 

Alan Gates commented on HIVE-13013:
-----------------------------------

+1

> Further Improve concurrency in TxnHandler
> -----------------------------------------
>
>                 Key: HIVE-13013
>                 URL: https://issues.apache.org/jira/browse/HIVE-13013
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore, Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Critical
>         Attachments: HIVE-13013.2.patch, HIVE-13013.3.patch, HIVE-13013.patch
>
>
> There are still a few operations in TxnHandler that run at Serializable isolation.
> Most or all of them can be dropped to READ_COMMITTED now that we have SELECT ... FOR
UPDATE support.  This will reduce number of deadlocks in the DBs.



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