Denys Kuzmenko created HIVE-24211:
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Summary: 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
Reporter: Denys Kuzmenko
*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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