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From Paul Dunkler <p...@uplex.de>
Subject Re: [Marketing Mail] Cassandra 2.1: Snapshot data changing while transferring
Date Tue, 31 May 2016 09:21:16 GMT
And - as an addition:

Shoudln't that be documented that even snapshot files can change?

> I guess this might come from the incremental repairs...
>> The repair time is stored in the sstable (RepairedAt timestamp metadata).
> 
> ok, that sounds interesting.
> Could that also happen to incremental backup files as well? I had another case where
incremental backup files were totally deleted automagically.
> 
> And - what is the suggested way to solve that problem? Should i try again tar-ing the
snapshot until it doesn't happen anymore that something changes in between?
> Or is there a way to "pause" the incremental repairs?
> 
> 
>> 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
>> 
> 
> —
> Paul Dunkler
> 
> ** * * UPLEX - Nils Goroll Systemoptimierung
> 
> Scheffelstraße 32
> 22301 Hamburg
> 
> tel +49 40 288 057 31
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> 
> xmpp://pauldunkler@jabber.ccc <xmpp://pauldunkler@jabber.ccc>.de
> 
> http://uplex.de/ <http://uplex.de/>

—
Paul Dunkler

** * * UPLEX - Nils Goroll Systemoptimierung

Scheffelstraße 32
22301 Hamburg

tel +49 40 288 057 31
mob +49 151 252 228 42
fax +49 40 429 497 53

xmpp://pauldunkler@jabber.ccc <xmpp://pauldunkler@jabber.ccc>.de

http://uplex.de/ <http://uplex.de/>

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