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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13249) Hard upper bound on number of open transactions
Date Mon, 14 Mar 2016 20:50:33 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15194098#comment-15194098
] 

Alan Gates commented on HIVE-13249:
-----------------------------------

There's already a threadpool in AcidHouseKeeperService.  This should use that rather than
having its own separate threadpool.

Once the number of open transactions exceeds the threshold you should require it to drain
a ways below that (maybe 90% of the threshold) before allowing new transactions.  This avoid
it constantly lurching in and out of trouble.



> Hard upper bound on number of open transactions
> -----------------------------------------------
>
>                 Key: HIVE-13249
>                 URL: https://issues.apache.org/jira/browse/HIVE-13249
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>    Affects Versions: 2.0.0
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>         Attachments: HIVE-13249.1.patch
>
>
> We need to have a safeguard by adding an upper bound for open transactions to avoid huge
number of open-transaction requests, usually due to improper configuration of clients such
as Storm.
> Once that limit is reached, clients will start failing.



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