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From Jonathan Ellis <>
Subject Re: is there a need to backup commit log?
Date Sat, 09 Jul 2011 12:44:20 GMT
Flush is done as part of the snapshot, so if you're not doing writes
post-snapshot, there's no need to ship commitlogs.  If you ARE still
doing writes, enable encremental backups to get sstables flushed
during the transfer.

On Sat, Jul 9, 2011 at 6:23 AM, Boris Yen <> wrote:
> Hi,
> Let's say if I want to migrate data from one cluster to another cluster, in
> addition to snapshots, is there a need to also backup the commit log?
> As far as I know, some of the data inside commit log might not have been
> flushed to sstable during snapshots, therefore, if I only backup the
> sstable, would it be some data lost when I restore these data in the new
> cluster?
> Regards
> Boris

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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