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 <bjer...@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* > > > *[image: Description: Description: > Visible-sm]*<http://www.visibletechnologies.com/> > ** > > Seattle *| *Boston* | *New York *|* London**** > > *Phone:* 425.957.6075* | Fax:* 781.404.5711 **** > > ** ** > > *Follow Visibly Intelligent Blog<http://www.visibletechnologies.com/blog/> > * > > ** ** > > [image: Description: Description: > LinkedIn_Logo60px[1]]<http://twitter.com/visible>[image: > Description: Description: > facebook]<http://www.facebook.com/Visible.Technologies> > [image: Description: Description: > in]<http://www.linkedin.com/company/visible-technologies> > **** > > ** ** >
