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From Jonathan Ellis <>
Date Fri, 25 Mar 2011 03:22:00 GMT
Right, Cassandra doesn't keep old versions around so to see an old
version you have to have uncompacted data and whack the new data --
either by blowing away sstables or not replaying the commitlog.

Snapshots flush before creating their hard links, which rules out any
commitlog problems.

If you ran out of disk space you wouldn't get past the commitlog
append, so you'd never get new data in at all after that.

Sounds like an environmental problem, not Cassandra specific.

On Thu, Mar 24, 2011 at 9:10 PM, aaron morton <> wrote:
> Was there anything in the server logs during startup ?
> I've not heard of this happening before and it's hard think of how / why
> cassandra could revert it's data. Other than something external playing with
> the files on disk
> Aaron
> On 25 Mar 2011, at 13:49, Jared Laprise wrote:
> Hello all, I’m running 2 Cassandra 6.5 nodes and I brought down the
> secondary node and restarted the primary node. After Cassandra came back up
> all data has been reverted to several months ago.
> I could really use some incite here, this is a production website and I need
> to act quickly. I have a cron job that takes a snapshot every night, but
> even with that I tried to restore a snapshot on my local development
> environment and it was also missing a ton of data.
> Any help will be so appreciated.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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