On Wed, Dec 16, 2009 at 1:20 AM, <[email protected]> wrote: > 1. Does anyone know how to locate all replica(on which node) of one key (for > monitor purpose)? Or any API can use?
StorageService.getNaturalEndpoints(StorageService.getPartitioner().getToken(key)) will do that, but it's not exposed via a tool yet. > 2. If one node down, can cassandra re-replicate missing rows automatically? > Or any utils can do it on demand? Cassandra assumes that a node that is down will be brought back up, unless you use "nodeprobe removetoken" to tell it the node is gone for good. If you do that, it will re-replicate data. > 2. If one node added, can cassandra re-balance automatically? Or any utils > can do it on demand? Yes. See http://wiki.apache.org/cassandra/Operations, specifically the Bootstrap section, but you should read the parts before that too for background.
