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https://issues.apache.org/jira/browse/HIVE-16399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15979166#comment-15979166
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Pengcheng Xiong commented on HIVE-16399:
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Hello, I am deferring this to Hive 3.0 as we are going to cut the first RC and 
it is not marked as blocker. Please feel free to commit to the branch if this 
can be resolved before the release.


> create an index for tc_txnid in TXN_COMPONENTS
> ----------------------------------------------
>
>                 Key: HIVE-16399
>                 URL: https://issues.apache.org/jira/browse/HIVE-16399
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Wei Zheng
>         Attachments: HIVE-16399.branch-2.3.patch, HIVE-16399.branch-2.patch, 
> HIVE-16399.master.patch
>
>
> w/o this TxnStore.cleanEmptyAbortedTxns() can be very slow



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