Re: cluster locks up from high MESSAGE-DESERIALIZER-POOL counts

2010-05-27 Thread Edmond Lau
choose a random node among equally close nodes > (if there's more than one). That would spread read load better across > replicas in a single data center where a lot of nodes are equidistant > from each other. > > CK. > > > > On Thu, May 27, 2010 at 3:59 PM, Edmond L

cluster locks up from high MESSAGE-DESERIALIZER-POOL counts

2010-05-27 Thread Edmond Lau
Occasionally, one of my six nodes gets a very high MESSAGE-DESERIALIZER-POOL pending count (over 100K). When that happens, it usually also has a decently high ROW-READ-STAGE pending count around 4K. All other nodes have very low load and no pending tasks. From reading other threads, this is usua

Re: Can Cassandra make real use of several DataFileDirectories?

2010-04-26 Thread Edmond Lau
Ryan - You (or maybe someone else) mentioned using RAID-0 instead of multiple data directories at the Cassandra hackathon as well. Could you explain the motivation behind that? Thanks, Edmond On Mon, Apr 26, 2010 at 9:53 AM, Ryan King wrote: > I would recommend using RAID-0 rather that multipl