Ujjawal Kumar created PHOENIX-7945:
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Summary: Retain orphaned delete markers (without puts) during
Phoenix compaction
Key: PHOENIX-7945
URL: https://issues.apache.org/jira/browse/PHOENIX-7945
Project: Phoenix
Issue Type: Improvement
Reporter: Ujjawal Kumar
Orphaned delete markers (DeleteFamily markers without corresponding puts) are
dropped during major compaction before Phoenix CompactionScanner can process
them.
HBase {{DropDeletesCompactionScanQueryMatcher.tryDropDelete()}} drops delete
markers whose timestamp < {{earliestPutTs}} when {{KeepDeletedCells=TTL}} and
{{timeToPurgeDeletes}} is 0. Since {{earliestPutTs}} is a *global minimum
across ALL HFiles* being compacted, a put in any other row HFile can cause
orphaned markers to be dropped before Phoenix CompactionScanner ever sees them.
h2. Fix
Set {{timeToPurgeDeletes = Long.MAX_VALUE}} in
{{{}setScanOptionsForFlushesAndCompactions(){}}}. This short-circuits
{{tryDropDelete()}} so HBase never purges delete markers -- Phoenix
CompactionScanner then applies its standard max-lookback logic.
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