Peter Vary created HIVE-22122:
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Summary: TxnHandler.getValidWriteIdsForTable optimization for
compacted tables
Key: HIVE-22122
URL: https://issues.apache.org/jira/browse/HIVE-22122
Project: Hive
Issue Type: Bug
Components: Transactions
Reporter: Peter Vary
When we do not find open writes for the given validTxnList then we either:
# do not have any writes on the table - we can return writeIdHwm = 0, and no
invalid/aborted writes;
# we have only compacted writes on the table - we can return writeIdHwm =
nextWriteId -1, and no invalid/aborted;
# we have compacted writes and some invalid writes on the table - we can
return the lowest invalid write as a writeIdHwm and set it as invalid.
What the current code does instead is sending writeIdHwm = nextWriteId -1, and
sending every write as invalid. This results the same response in case 1-2, but
probably a longer list in case 3.
So we have place for some optimizations
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