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https://issues.apache.org/jira/browse/HIVE-24211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211074#comment-17211074
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Denys Kuzmenko commented on HIVE-24211:
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Merged to master.
Thank you for the review, [~pvarga] and [~pvary]!
> Replace Snapshot invalidate logic with WriteSet check for txn conflict
> detection
> --------------------------------------------------------------------------------
>
> Key: HIVE-24211
> URL: https://issues.apache.org/jira/browse/HIVE-24211
> Project: Hive
> Issue Type: Bug
> Components: Transactions
> Reporter: Denys Kuzmenko
> Assignee: Denys Kuzmenko
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> *Issue with concurrent writes on partitioned table:*
> Concurrent writes on different partitions should execute in parallel without
> issues. They acquire a shared lock on table level and exclusive write on
> partition level (hive.txn.xlock.write=true).
> However there is a problem with the Snapshot validation. It compares valid
> writeIds seen by current transaction, recorded before locking, with the
> actual list of writeIds. The Issue is that writeId in Snapshot has no
> information on partition, meaning that concurrent writes to different
> partitions would be seen as writes to the same non-partitioned table causing
> Snapshot to be obsolete.
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