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From Jeremiah Jordan <>
Subject Re: exporting data from Cassandra cluster
Date Fri, 09 Dec 2011 21:46:00 GMT
Once you get all of the data on one machine you can then 
flush/drain/compact shutdown the single node and then take the data 
folder off that machine and back it up.  Then when you get your new 
cassandra cluster setup you can use the sstable loader to shoot the data 
from the backup into the new cluster.

On 12/09/2011 07:09 AM, Alexandru Dan Sicoe wrote:
> Hi Jeremiah,
>  The thing is I will send the data to a massive storage facility (I 
> don't know what's behind the scenes) so I won't be backing up on one 
> machine where I can install Cassandra. Does the sstable loader work 
> just for copying data from a Cassandra cluster to somewhere on a disk 
> where there is no Cassandra instance? If not what is the best way/tool 
> to achieve that?
> Cheers,
> Alexandru
> On Wed, Dec 7, 2011 at 10:00 PM, Jeremiah Jordan 
> < 
> <>> wrote:
>     Stop your current cluster.  Start a new cassandra instance on the
>     machine you want to store your data on.  Use the sstable loader to
>     load the sstables from all of the current machines into the new
>     machine.  Run major compaction a couple times.  You will have all
>     of the data on one machine.
>     On 12/07/2011 10:17 AM, Alexandru Dan Sicoe wrote:
>         Hello everyone.
>          3 node Cassandra 0.8.5 cluster. I've left the system running
>         in production environment for long term testing. I've
>         accumulated about 350GB of data with RF=2. The machines I used
>         for the tests are older and need to be replaced. Because of
>         this I need to export the data to a permanent location. How
>         should I export the data? In order to reduce the storage spac
>         I want to export only the non-replicated data? I mean, just
>         one copy of the data (without the replicas). Is this possible?
>         How?
>         Cheers,
>         Alexandru

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