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https://issues.apache.org/jira/browse/HIVE-22745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020475#comment-17020475
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Gopal Vijayaraghavan commented on HIVE-22745:
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HIVE-20801 is pretty much complete and has a +1, needs a rebase + commit.
This config name needs to be switched over to indicate it relies on the Cleaner
(let me get a WIP for that today & send it to you).
So these two tie to this config
https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/CompactionTxnHandler.java#L258
+
https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/CompactionTxnHandler.java#L335
So even without readlocks we can have a cleaner work safely by using
long minUncommittedTxnId = findMinOpenTxnGLB(stmt);
to slow the cleaner pass.
> Config option to turn off read locks
> ------------------------------------
>
> Key: HIVE-22745
> URL: https://issues.apache.org/jira/browse/HIVE-22745
> Project: Hive
> Issue Type: Improvement
> Components: Transactions
> Reporter: Ashutosh Chauhan
> Assignee: Slim Bouguerra
> Priority: Major
> Attachments: HIVE-22745.2.patch, HIVE-22745.patch
>
>
> Although its not recommended but in perf critical scenario this option may be
> exercised. We have observed lock acquisition to take long time in heavily
> loaded system.
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