[jira] [Commented] (HIVE-12389) CompactionTxnHandler.cleanEmptyAbortedTxns() should safeguard against huge IN clauses

["Eugene Koifman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15001604#comment-15001604 ] 

Eugene Koifman commented on HIVE-12389:
---------------------------------------

blocked by HIVE-11948 to minimize conflicts

> CompactionTxnHandler.cleanEmptyAbortedTxns() should safeguard against huge IN clauses
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-12389
>                 URL: https://issues.apache.org/jira/browse/HIVE-12389
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore, Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>
> in extreme situations, due to misconfigurations, it may be possible to have 100Ks or even 1Ms of aborted txns.
> This causes delete from TXNS where txn_id in (...) to have a huge IN clause and DB chokes.  
> Should use something like TxnHandler.TIMED_OUT_TXN_ABORT_BATCH_SIZE to break up delete into multiple queries.  (Incidentally the batch size should likely be 1000, not 100, maybe even configurable).



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