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https://issues.apache.org/jira/browse/HIVE-20823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16765829#comment-16765829
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Abhishek Somani commented on HIVE-20823:
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[~ekoifman], [~vgumashta] Is there a plan to backport this to the 3.x branch?
> Make Compactor run in a transaction
> -----------------------------------
>
> Key: HIVE-20823
> URL: https://issues.apache.org/jira/browse/HIVE-20823
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-20823.01.patch, HIVE-20823.03.patch,
> HIVE-20823.04.patch, HIVE-20823.05.patch, HIVE-20823.07.patch,
> HIVE-20823.08.patch, HIVE-20823.09.patch, HIVE-20823.10.patch,
> HIVE-20823.11.patch, HIVE-20823.11.patch, HIVE-20823.12.patch,
> HIVE-20823.13.patch, HIVE-20823.14.patch
>
>
> 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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