Eugene Koifman created HIVE-21266:
-------------------------------------
Summary: Issue with single delta file
Key: HIVE-21266
URL: https://issues.apache.org/jira/browse/HIVE-21266
Project: Hive
Issue Type: Sub-task
Affects Versions: 4.0.0
Reporter: Eugene Koifman
Assignee: Vaibhav Gumashta
[https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactorMR.java#L353-L357]
{noformat}
if ((deltaCount + (dir.getBaseDirectory() == null ? 0 : 1)) + origCount <= 1) {
LOG.debug("Not compacting {}; current base is {} and there are {} deltas
and {} originals", sd.getLocation(), dir
.getBaseDirectory(), deltaCount, origCount);
return;
}
{noformat}
Is problematic.
Suppose you have 1 delta file from streaming ingest: {{delta_11_20}} where
{{txnid:13}} was aborted. The code above will not rewrite the delta (which
drops anything that belongs to the aborted txn) and transition the compaction
to "ready_for_cleaning" which will drop the metadata about the aborted txn.
Now aborted data will come back as committed.
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