[jira] [Assigned] (HIVE-20823) Make Compactor run in a transaction

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

     [ https://issues.apache.org/jira/browse/HIVE-20823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eugene Koifman reassigned HIVE-20823:
-------------------------------------


> Make Compactor run in a transaction
> -----------------------------------
>
>                 Key: HIVE-20823
>                 URL: https://issues.apache.org/jira/browse/HIVE-20823
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Major
>
> Have compactor open a transaction and run the job in that transaction.
> # make compactor produced base/delta include this txn id in the folder name, e.g. base_7_c17 where 17 is the txnid.
> # add {{CQ_TXN_ID bigint}} to COMPACTION_QUEUE and COMPLETED_COMPACTIONS to record this txn id
> # make sure {{AcidUtils.getAcidState()}} pays attention to this transaction on read and ignores this dir if this txn id is not committed in the current snapshot
> ## this means not only validWriteIdList but ValidTxnIdList should be passed along in config (if it isn't yet)
> # once this is done, {{CompactorMR.createCompactorMarker()}} can be eliminated and {{AcidUtils.isValidBase}} modified accordingly
> # modify Cleaner so that it doesn't clean old files until new file is visible to all readers
> # 



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