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From "Brandon Williams (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10505) Duplicate range tombstones
Date Mon, 12 Oct 2015 15:46:05 GMT


Brandon Williams commented on CASSANDRA-10505:

I applied 7953v2 and forced a compaction to no avail.  I should also note that you don't need
multiple sstables to make the dupes grow, forcing a major on a single table is enough.

> Duplicate range tombstones
> --------------------------
>                 Key: CASSANDRA-10505
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Brandon Williams
>             Fix For: 2.1.x
> 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.

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