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https://issues.apache.org/jira/browse/HIVE-20436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16779825#comment-16779825
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Vaibhav Gumashta commented on HIVE-20436:
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Look at notes in {{TxnHandler.checkLock}}
> Lock Manager scalability - linear
> ---------------------------------
>
> Key: HIVE-20436
> URL: https://issues.apache.org/jira/browse/HIVE-20436
> Project: Hive
> Issue Type: Improvement
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Priority: Major
>
> Hive TransactionManager currently has a mix of lock based and optimistic
> concurrency management techniques (which at times overlap).
> For inserts with Dynamic Partitions that represents update/merge it acquires
> locks on each existing partition which can flood the metastore DB.
> Need to clean up the logical model and the implementation.
> This will be an umbrella Jira for this
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