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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: zookeeper data backup
Date Fri, 05 Aug 2011 16:00:29 GMT
If you have the transaction log and the snapshot, you have a backup.

You might want to investigate using an observer or non-voting ZK instance as
a backup mechanism.  This would not upset your quorum since that machine
would not participate in leader elections or in getting a quorum for
commits.  It would give you very current backups.

On Fri, Aug 5, 2011 at 11:30 AM, Damu R <damu.devnull@gmail.com> wrote:

> Hi,
> I am in the process of setting up regular backup of zookeeper data
> directory. Is there any documentation available on the recommended
> tool/method or issues to be aware of? Some of by doubts are:
> 1. what is the recommended frequency of backup? is there any case where
> zookeeper may decide to get a complete data dump instead of using the
> latest
> snapshot and replaying transactions?
> 2. from my understanding after reading the zookeeper administration guide,
> zookeeper starts a fuzzy snapshot after a configured number of operations.
> for backing up we need to take the latest snapshot and the transaction log
> file. how do you avoid copying the snapshot when zookeeper is in the
> process
> of writing the snapshot file itself?
> It would be helpful if you can provide me some pointers on the possible
> solutions.
> Regards
> Damu

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