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From "Sylvain Lebresne (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-5151) Implement better way of eliminating compaction left overs.
Date Fri, 18 Jan 2013 18:22:12 GMT


Sylvain Lebresne commented on CASSANDRA-5151:

That's true, but we don't store counters in the system tables (and I take on myself to veto
whomever suggests to change that fact), so it's safe to always pick all sstables without consulting
the compaction log. In other words I suggest special casing the system keyspace on startup
so it don't bother with the compaction log. As far as I'm prefer, I prefer that many times
to relying on an external file.
> Implement better way of eliminating compaction left overs.
> ----------------------------------------------------------
>                 Key: CASSANDRA-5151
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.1.3
>            Reporter: Yuki Morishita
>            Assignee: Yuki Morishita
>             Fix For: 1.2.1
>         Attachments: 5151-1.2.txt
> This is from discussion in CASSANDRA-5137. Currently we skip loading SSTables that are
left over from incomplete compaction to not over-count counter, but the way we track compaction
completion is not secure.
> One possible solution is to create system CF like:
> {code}
> create table compaction_log (
>   id uuid primary key,
>   inputs set<int>,
>   outputs set<int>
> );
> {code}
> to track incomplete compaction.

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