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https://issues.apache.org/jira/browse/HIVE-13013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151017#comment-15151017
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Alan Gates commented on HIVE-13013:
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+1, looks good.
> 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.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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