Peter Varga created HIVE-24291:
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Summary: Compaction Cleaner prematurely cleans up deltas
Key: HIVE-24291
URL: https://issues.apache.org/jira/browse/HIVE-24291
Project: Hive
Issue Type: Bug
Reporter: Peter Varga
Assignee: Peter Varga
Since HIVE-23107 the cleaner can clean up deltas that are still used by running
queries.
Example:
* TxnId 1-5 writes to a partition, all commits
* Compactor starts with txnId=6
* Long running query starts with txnId=7, it sees txnId=6 as open in its
snapshot
* Compaction commits
* Cleaner runs
Previously min_history_level table would have prevented the Cleaner to delete
the deltas1-5 until txnId=7 is open, but now they will be deleted and the long
running query may fail if its tries to access the files.
Solution could be to not run the cleaner until any txn is open that was opened
before the compaction was committed (CQ_NEXT_TXN_ID)
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