[CASSANDRA-10505] Duplicate range tombstones

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Duplicate
• Severity: Normal
• Assignee: Unassigned
• Reporter: Brandon Williams
• Created: 12/Oct/15 15:12
• Updated: 16/Apr/19 09:30
• Resolved: 14/Oct/15 14:40

Description

I don't have a way to reproduce this just yet, but I have the sstables to prove it and can provide those offline. What I can reproduce, however, is the magnification of this problem via compaction. Here's what I know so far:

• under some condition, we flush the exact same RT more than once in the same sstable. Same timestamps, everything.
• Once this happens in multiple sstables, compacting them causes the duplication to grow. The more this occurs, the worse the problem gets.

This continues until gc_grace has passed, then they are all evicted normally. I'd at least like to take a look at the compaction amplification for now, that way if the condition does occur, at least compaction can help it, rather than exacerbate it.

Issue Links

• duplicates: CASSANDRA-7953 RangeTombstones not merging during compaction