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https://issues.apache.org/jira/browse/HIVE-20801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778980#comment-16778980
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Ashutosh Chauhan commented on HIVE-20801:
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bq. Just that Hive is slowed down by a magnitude when ACID is enabled for even
1 tables.
>From where this slowness coming from? Is that acquiring locks for is slow?
> ACID: Allow DbTxnManager to ignore non-ACID table locking
> ---------------------------------------------------------
>
> Key: HIVE-20801
> URL: https://issues.apache.org/jira/browse/HIVE-20801
> Project: Hive
> Issue Type: Bug
> Components: Locking, Transactions
> Affects Versions: 4.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Major
> Labels: Branch3Candidate, TODOC
> Attachments: HIVE-20801.1.patch, HIVE-20801.2.patch,
> HIVE-20801.2.patch, HIVE-20801.3.patch
>
>
> Enabling ACIDv1 on a cluster produces a central locking bottleneck for all
> table types, which is not always the intention.
> The Hive locking for non-acid tables are advisory (i.e a client can
> write/read without locking), which means that the implementation does not
> offer strong consistency despite the lock manager consuming resources
> centrally.
> Disabling this lock acquisition would improve the performance of non-ACID
> tables co-existing with a globally configured DbTxnManager implementation.
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