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From Thorsten von Eicken <...@rightscale.com>
Subject Re: backing up data from cassandra
Date Mon, 05 Oct 2009 16:23:09 GMT
Isn't the question about how you back up a cassandra cluster, not a
single node? Can you snapshot the various nodes at different times or do
they need to be synchronized? Is there a minimal set of nodes that are
sufficient to back up?
    Thorsten

Jonathan Ellis wrote:
> bin/nodeprobe snapshot
>
> to restore, move the snapshot sstables from the snapshot location to
> the live data location (e.g. with dsh).
>
> note that the 0.4 branch, which will become 0.4.1, automatically
> flushes each columnfamily when you ask for a snapshot of the table, so
> you don't have to do that manually anymore.
>
> On Mon, Oct 5, 2009 at 8:05 AM, Joe Van Dyk <joevandyk@gmail.com> wrote:
>   
>> How do you take the snapshot?  What's the restore process?
>>
>> On Mon, Oct 5, 2009 at 5:22 AM, Jonathan Ellis <jbellis@gmail.com> wrote:
>>     
>>> You can take a snapshot and either leave it in place indefinitely or
>>> throw it into your existing backup ecosystem.  That's your best option
>>> for backup no matter which kind of partitioner you're using.
>>>
>>> -Jonathan
>>>
>>> On Mon, Oct 5, 2009 at 12:52 AM, Edmond Lau <edmond@ooyala.com> wrote:
>>>       
>>>> For folks who are using or considering using cassandra in their
>>>> production systems, what do you use for backups?
>>>>
>>>> With HBase, one could potentially write a mapreduce to perform a row
>>>> scan of the entire table (restricted to some historical timestamp to
>>>> get a consistent view) and export the data to hdfs.  With Cassandra,
>>>> if you're using an ordered partitioner, a similar mechanism could be
>>>> built over a key range scan.
>>>>
>>>> With a random partitioner, though, there's no api to iterate through
>>>> all existing keys.  Why not?
>>>>
>>>> Edmond
>>>>
>>>>         
>> --
>> Joe Van Dyk
>> http://fixieconsulting.com
>>
>>     
>
>   


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