[jira] [Assigned] (HIVE-27198) Delete directly aborted transactions instead of select and loading ids

["Mahesh Raju Somalaraju (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-27198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mahesh Raju Somalaraju reassigned HIVE-27198:
---------------------------------------------


> Delete directly aborted transactions instead of select and loading ids
> ----------------------------------------------------------------------
>
>                 Key: HIVE-27198
>                 URL: https://issues.apache.org/jira/browse/HIVE-27198
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Mahesh Raju Somalaraju
>            Assignee: Mahesh Raju Somalaraju
>            Priority: Major
>
> in cleaning the aborted transaction , we can directly deletes the txns instead of selecting and process.
> method name: 
> cleanEmptyAbortedAndCommittedTxns
> Code:
> String s = "SELECT \"TXN_ID\" FROM \"TXNS\" WHERE " +
> "\"TXN_ID\" NOT IN (SELECT \"TC_TXNID\" FROM \"TXN_COMPONENTS\") AND " +
> " (\"TXN_STATE\" = " + TxnStatus.ABORTED + " OR \"TXN_STATE\" = " + TxnStatus.COMMITTED + ") AND "
> + " \"TXN_ID\" < " + lowWaterMark;
>  
> proposed code:
> String s = "DELETE \"TXN_ID\" FROM \"TXNS\" WHERE " +
> "\"TXN_ID\" NOT IN (SELECT \"TC_TXNID\" FROM \"TXN_COMPONENTS\") AND " +
> " (\"TXN_STATE\" = " + TxnStatus.ABORTED + " OR \"TXN_STATE\" = " + TxnStatus.COMMITTED + ") AND "
> + " \"TXN_ID\" < " + lowWaterMark;
>  
> the select needs to be eliminated and the delete should work with the where clause instead of the built in clause
> we can see no reason for loading the ids into memory and then generate a huge sql
>  
> Bathcing is also not necessary here, we can deletes the records directly



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