[jira] [Updated] (HIVE-11948) Investigate TxnHandler and CompactionTxnHandler to see where we can reduce transaction isolation level

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

     [ https://issues.apache.org/jira/browse/HIVE-11948?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Koifman updated HIVE-11948:
----------------------------------
    Attachment: HIVE-11948.patch

> Investigate TxnHandler and CompactionTxnHandler to see where we can reduce transaction isolation level
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-11948
>                 URL: https://issues.apache.org/jira/browse/HIVE-11948
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 0.14.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>         Attachments: HIVE-11948.patch
>
>
> at least some operations (or parts of operations) can run at READ_COMMITTED.
> CompactionTxnHandler.setRunAs()
> CompactionTxnHandler.findNextToCompact()
> if update stmt includes cq_state = '" + INITIATED_STATE + "'" in WHERE clause and logic to look for "next" candidate
> CompactionTxnHandler.markCompacted()
> perhaps add cq_state=WORKING_STATE in Where clause (mostly as an extra consistency check)



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