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https://issues.apache.org/jira/browse/HIVE-22755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020942#comment-17020942
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Peter Vary commented on HIVE-22755:
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In my deleted comment I misunderstood the purpose of the jira :(
The read lock is needed so there is no concurrent DDL command running parallel
the compaction. Before having versioned table/partition metadata, removing this
read lock could be problematic.
> Cleaner/Compaction can skip the read locks and use the min open txn id
> ----------------------------------------------------------------------
>
> Key: HIVE-22755
> URL: https://issues.apache.org/jira/browse/HIVE-22755
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Slim Bouguerra
> Priority: Major
> Fix For: 4.0.0
>
>
> The minOpenTxnId is used by the Cleaner here
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/Cleaner.java#L154
> This currently converts it to open write-ids to clean appropriately.
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