Blake Eggleston created CASSANDRA-14894:
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Summary: RangeTombstoneList doesn't properly clean up mergeable or
superseded rts in some cases
Key: CASSANDRA-14894
URL: https://issues.apache.org/jira/browse/CASSANDRA-14894
Project: Cassandra
Issue Type: Bug
Reporter: Blake Eggleston
Assignee: Blake Eggleston
Fix For: 3.0.18, 3.11.4, 4.0
There are a few scenarios RangeTombstoneList doesn't handle correctly.
If there are 2 overlapping range tombstones with identical timestamps, they
should be merged. Instead, they're stored as 2 rts with congruent bounds and
identical timestamps.
If a range tombstone supersedes multiple sequential range tombstones, instead
of removing them, they cause the superseding rt to be split into multiple rts
with congruent bounds and identical timestamps.
When converted to an UnfilteredRowIterator, these become extra boundary markers
with the same timestamp on each side. Logically these are noops, but they do
cause digest mismatches which will cause unneeded read repairs, and repair
overstreaming (since they're also included in flushed sstables).
Also, not sure if this is reachable in practice, but querying RTL with an empty
slice that covers a range tombstone causes an rt to be returned with an empty
slice. If reachable this might cause extra read repairs as well.
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