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From Sasha Dolgy <sdo...@gmail.com>
Subject Re: Aamzon EC2 & Cassandra to ebs or not..
Date Wed, 09 Mar 2011 16:59:38 GMT
Hi will,

Quickly did a snapshot:

nodetool -h 10.0.0.2 -p 8080 snapshot 09032011

The snapshots end up in the data dir for cassandra.  The default is
/var/lib/cassandra/data/<keyspace>/snapshots/

In this directory i have:  1299689801925-09032011

-sd

On Wed, Mar 9, 2011 at 5:54 PM, William Oberman <oberman@civicscience.com>wrote:

> I haven't done backups yet, so I don't know where the data is written.  Is
> it where the nodetool is run from?  Or local to the instance running
> cassandra (and there, local to the data directory?).  I assumed it was the
> latter (not finding docs on that yet), and that would require 2x storage
> allocated on that instance for 1x data (to have room for the snapshot).  If
> its the former, then yes, I'd totally run the command from an ephemeral
> store, and backup to S3.
>
> will
>
>
> On Wed, Mar 9, 2011 at 11:48 AM, Sasha Dolgy <sdolgy@gmail.com> wrote:
>
>> Hi Will,
>>
>> http://wiki.apache.org/cassandra/Operations#Backing_up_data
>>
>> <http://wiki.apache.org/cassandra/Operations#Backing_up_data>If the
>> snapshot is written to the ephemeral storage ... there isn't a cost. (i need
>> to confirm that)
>>
>> You can then move this to an S3 bucket with RDS if you want or full
>> 99.999999999% redundancy and have it available to developers
>>
>> This is what I had in my head....
>> -sd
>>
>>
>> On Wed, Mar 9, 2011 at 5:39 PM, William Oberman <oberman@civicscience.com
>> > wrote:
>>
>>> I thought nodetool snapshot writes the snapshot locally, requiring 2x of
>>> expensive storage allocation 24x7 (vs. cheap storage allocation of a ebs
>>> snapshot).  By that I mean EBS allocation is GB allocated per month costs at
>>> one rate, and EBS snapshots are delta compressed copies to S3.
>>>
>>> Can you point the snapshot to an external filesystem?
>>>
>>> will
>>>
>>>
>
>
> --
> Will Oberman
> Civic Science, Inc.
> 3030 Penn Avenue., First Floor
> Pittsburgh, PA 15201
> (M) 412-480-7835
> (E) oberman@civicscience.com
>



-- 
Sasha Dolgy
sasha.dolgy@gmail.com

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