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https://issues.apache.org/jira/browse/HIVE-19961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eugene Koifman reassigned HIVE-19961:
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> Add partition if exists on transactional CRUD table acquires X lock
> -------------------------------------------------------------------
>
> Key: HIVE-19961
> URL: https://issues.apache.org/jira/browse/HIVE-19961
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Priority: Major
>
> This is necessary for correctness since each add partition consists of 2 parts
> # Add Partition metadata object to metastore
> # Create a delta dir and copy data there.
> This means it's neither Atomic not Isolated. Isolation is fixed by using X
> lock (which is currently on the table. todo: see if it can be made on the
> partition being created - this may block table level locks...)
> Atomicity would have to be addressed by adding a write ID to Partition to
> that it's not visible until Hive transaction has committed.
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