Many thanks Aaron. I will post a support issue for them. But will keep the
snapshot + incremental backups + commitlogs to recover any failure
situation.
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If you delete the commit logs you are rolling back to exactly what was in the
snapshot. When you take a snapshot it flushes the memtables first, so there is
nothing in the commit log that is not in the snapshot. Rolling back to a
snapshot is rollback to that point in time.
If you want to resto
http://www.datastax.com/docs/1.0/operations/backup_restore
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Can you provide a link to that page ?
Cheers
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Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 1/05/2012, at 10:12 AM, Roshan wrote:
> Many Thanks Aaron.
>
> According to the datastax restore documentation, they ask to remove the
> commitlogs befor
Many Thanks Aaron.
According to the datastax restore documentation, they ask to remove the
commitlogs before restoring (Clear all files the
/var/lib/cassandra/commitlog (by default)).
In that case better not to follow this step in a server rash situation.
Thanks
/Roshan
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When the server starts it reads the SSTables then applies the Commit Logs.
There is nothing you need to do other than leave the commit logs where they
are.
Cheers
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Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 30/04/2012, at 6:02 PM, Roshan wr
Hi Aaron
Thanks for the comments. Yes for the durability will keep them in a safe
place. But such crash situation, how can I restore the data (because those
are not in a SSTable and only in commit log).
Do I need to replay only that commit log when server starts after crash?
Will it override the
> 1. If I already have a Cassandra cluster running, would changing the
> incremental_backups parameter in the cassandra.yaml of each node, and then
> restart it do the trick?
Yes it is a per node setting.
> 2. Assuming I am creating a daily snapshot, what is the gain from setting
> incrementa
Each mutation is applied to the commit log before being applied to the
memtable. On server start the SSTables are read before replaying the commit
logs. This is part of the crash only software design and happens for every
start.
AFAIk there is no facility to snapshot commit log files as they ar
Tamar
Please don't jump to other users discussions. If you want to ask any issue,
create a new one, please.
Thanks.
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I want to add a couple of questions regrading incremental backups:
1. If I already have a Cassandra cluster running, would changing the i
ncremental_backups parameter in the cassandra.yaml of each node, and then
restart it do the trick?
2. Assuming I am creating a daily snapshot, what is the gain
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