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https://issues.apache.org/jira/browse/HIVE-13013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15143336#comment-15143336
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Alan Gates commented on HIVE-13013:
-----------------------------------
This will take me a bit to comb through completely as the changes are pretty in
depth, but one piece of early feedback is that it would be useful to
distinguish the new lock() and unlock() functions with names like derbyLock()
or localLock() or something since there's multiple types of locks floating
around here.
> 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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