Work is broken up into a series of stages. - ReadStage - performing a local read. - RequestResponseStage - handling responses from other nodes. - MutationStage - performing a local write. - ReplicateOnWriteStage - for counter writes, replicates after a local write - GossipStage - handles gossip rounds (ever second) - AntiEntropyStage - repairs consistency (nodetool reapir) - MigrationStage - schema changes - MemtablePostFlusher - flush commit log (and other things) after flushing memtable. - StreamStage - streams data between nodes during repair - FlushWrite - Flush memtable to disk - MiscStage - does misc stuff - InternalResponseStage - not sure. - HintedHandoff - sends missed mutations to other nodes.
Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 23/03/2012, at 9:49 PM, Rishabh Agrawal wrote: > Hello > I am new to Cassandra and when I run tpstats on my node (Cassandra 1.0.7) I > get following output: > > Pool Name Active Pending Completed Blocked All > time blocked > ReadStage 0 0 12 0 > 0 > RequestResponseStage 0 0 20 0 > 0 > MutationStage 0 0 14 0 > 0 > ReadRepairStage 0 0 14 0 > 0 > ReplicateOnWriteStage 0 0 0 0 > 0 > GossipStage 0 0 273665 0 > 0 > AntiEntropyStage 0 0 0 0 > 0 > MigrationStage 0 0 119 0 > 0 > MemtablePostFlusher 0 0 13 0 > 0 > StreamStage 0 0 0 0 > 0 > FlushWriter 0 0 13 0 > 0 > MiscStage 0 0 0 0 > 0 > InternalResponseStage 0 0 318 0 > 0 > HintedHandoff 0 0 2 0 > 0 > > Can anyone help with what each pool name stands for? > > Thanks and Regards > Rishabh Agrawal > > > Impetus to sponsor and exhibit at Structure Data 2012, NY; Mar 21-22. Know > more about our Big Data quick-start program at the event. > > New Impetus webcast ‘Cloud-enabled Performance Testing vis-à-vis On-premise’ > available at http://bit.ly/z6zT4L. > > > NOTE: This message may contain information that is confidential, proprietary, > privileged or otherwise protected by law. The message is intended solely for > the named addressee. If received in error, please destroy and notify the > sender. Any use of this email is prohibited when received in error. Impetus > does not represent, warrant and/or guarantee, that the integrity of this > communication has been maintained nor that the communication is free of > errors, virus, interception or interference.
