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From Reynald Bourtembourg <reynald.bourtembo...@esrf.fr>
Subject Re: [Marketing Mail] Cassandra 2.1: Snapshot data changing while transferring
Date Tue, 31 May 2016 09:17:15 GMT
Hi Paul,

I guess this might come from the incremental repairs...
The repair time is stored in the sstable (RepairedAt timestamp metadata).

Cheers,
Reynald

On 31/05/2016 11:03, Paul Dunkler wrote:
> Hi there,
>
> i am sometimes running in very strange errors while backing up 
> snapshots from a cassandra cluster.
>
> Cassandra version:
> 2.1.11
>
> What i basically do:
> 1. nodetool snapshot
> 2. tar all snapshot folders into one file
> 3. transfer them to another server
>
> What happens is that tar just sometimes give the error message "file 
> changed as we read it" while its adding a .db-file from the folder of 
> the previously created snapshot.
> If i understand everything correct, this SHOULD never happen. 
> Snapshots should be totally immutable, right?
>
> Am i maybe hitting a bug or is there some rare case with running 
> repair operations or what-so-ever which can change snapshotted data?
> I already searched through cassandra jira but couldn't find a bug 
> which looks related to this behaviour.
>
> Would love to get some help on this.
>
> —
> Paul Dunkler


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