updates being dropped on the floor is exactly what that message means (the batch_mutate you send are decomposed under the hood to individual rows for replication, which is why the number is greater than your 3000)
On Fri, Aug 20, 2010 at 3:50 PM, Ronald Park <ronald.p...@cbsinteractive.com> wrote: > How about this message: > > WARN [DroppedMessagesLogger] 2010-08-20 08:02:27,668 MessagingService.java > (lin > e 512) Dropped 46469 messages in the last 1000ms > > For this application, I also have a 3-node cluster but I'm running a version > of Cassandra built off the trunk (we wanted the 'time to live' feature > before 0.7.beta was out). My application runs a daily loading script which > peaks at under 3000 batch_mutate requests per second, well below the 46K in > this log. Are these some sort of internal messages, like pings? Or are > updates being dropped on the floor? > > Thanks, > Ron > > On Wed, Aug 18, 2010 at 9:13 AM, Jonathan Ellis <jbel...@gmail.com> wrote: >> >> This is Cassandra trying to protect itself from the load spike. You >> probably need to balance your nodes, tune for performance, add >> capacity, or some combination. >> >> On Wed, Aug 18, 2010 at 6:16 AM, Jianing Hu <jian...@gmail.com> wrote: >> > We have a 3-node cluster of Cassandra 0.6.4, on one of them there's a >> > ton of error message like the following one: >> > WARN [MESSAGE-DESERIALIZER-POOL:1] 2010-08-18 04:10:57,767 >> > MessageDeserializationTask.java (line 47) dropping message (1ms past >> > timeout) >> > >> > The nod's load spikes and is super slow to read from. Any ideas? >> > >> > Thanks. >> > >> > - Jianing >> > >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of Riptano, the source for professional Cassandra support >> http://riptano.com > > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
