Karen Coppage created HIVE-25492:
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Summary: Major query-based compaction is skipped if partition is
empty
Key: HIVE-25492
URL: https://issues.apache.org/jira/browse/HIVE-25492
Project: Hive
Issue Type: Bug
Reporter: Karen Coppage
Currently if the result of query-based compaction is an empty base, delta, or
delete delta, the empty directory is deleted.
This is because of minor compaction – if there are only deltas to compact, then
no compacted delete delta should be created (only a compacted delta). In the
same way, if there are only delete deltas to compact, then no compacted delta
should be created (only a compacted delete delta).
There is an issue with major compaction. If all the data in the partition has
been deleted, then we should get an empty base directory after compaction.
Instead, the empty base directory is deleted because it's empty and compaction
claims to succeed but we end up with the same deltas/delete deltas we started
with – basically compaction does not run.
Where to start? MajorQueryCompactor#commitCompaction
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