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From Jun Rao <jun...@gmail.com>
Subject Re: Changing replication factors in 0.8.
Date Tue, 12 Feb 2013 05:42:27 GMT
Bob,

We do plan to support changing replication factors online in the future.
This will be a post 0.8 feature though.

Thanks,

Jun

On Mon, Feb 11, 2013 at 9:32 AM, Bob Jervis <bjervis@visibletechnologies.com
> wrote:

> In testing our 0.8 cluster, we started by just using the sample
> server.properties file that ships with 0.8 and tweaking it.  The
> replication factor property did not have an exemplar in the file, so we
> didn’t include it.  Naturally, the cluster did not do replication.****
>
> ** **
>
> After sending some data through the tests, we then added replication
> factor=2 to the config and restarted the cluster.  After a half-hour it did
> not appear to replicate the topic data we had generated during the first
> test.  We had to erase the topics entirely and start from scratch.
> Replication then happened and when we took down a broker we saw the gaps in
> the topic data get filled in after restarting it.****
>
> ** **
>
> In the future, what is the correct way to get a Kafka cluster to change
> the replication factor on an existing topic?  Will we have to flush all
> data from the cluster for a given topic, or is there a recommended way to
> convert existing data?****
>
> ** **
>
> *Bob Jervis | Senior Architect*
>
>
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