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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-6756) Provide option to avoid loading orphan SSTables on startup
Date Wed, 18 Jun 2014 19:28:25 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brandon Williams resolved CASSANDRA-6756.
-----------------------------------------

    Resolution: Won't Fix

I believe the consensus reached here was there is no way to do this, since there is no canonical
source of truth.  If we trust what's on disk and there's a bug, we might resurrect data, if
we trust the manifest and there's a bug, we might lose data.

> Provide option to avoid loading orphan SSTables on startup
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-6756
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6756
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Vincent Mallet
>             Fix For: 1.2.17
>
>
> When Cassandra starts up, it enumerates all SSTables on disk for a known column family
and proceeds to loading all of them, even those that were left behind before the restart because
of a problem of some sort. This can lead to "data gain" (resurrected data) which is just as
bad as data loss.
> The ask is to provide a yaml config option which would allow one to turn that behavior
off by default so a cassandra cluster would be immune to data gain when nodes get restarted
(at least with Leveled where Cassandra keeps track of SSTables).
> This is sort of a follow-up to CASSANDRA-6503 (fixed in 1.2.14). We're just extremely
nervous that orphan SSTables could appear because of some other potential problem somewhere
else and cause zombie data on a random reboot. 



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