I don't think so, perhaps more succinctly, why would ROW actions only be
performed on a single node?
Ian
On Wed, Aug 10, 2011 at 8:12 PM, Jonathan Ellis <jbel...@gmail.com> wrote:
> are you i/o bound? I believe counter ROW needs to perform a read of
> the old value.
>
> On Wed, Aug 10, 2011 at 7:17 PM, Ian Danforth <idanfo...@numenta.com>
> wrote:
> > Hello all!
> > Thanks for taking the time to read this, I'm new to Cassandra and really
> > want to get it working :)
> > Below you'll find the output from tpstats on the three nodes in my .8.1
> > cluster. As you'll note from ring (also below), my cluster appears
> balanced.
> > However, please note that NODE1 is the only node that has completed any
> > ReplicateOnWriteStage actions. I've been having a lot of trouble with RoW
> > and seen a single node in my various test clusters get hugely backed up
> on
> > this stage to the point where it slows all writes to a crawl.
> > I'm using counters in a column family defined like this:
> > ==== KEYSPACE/CF ====
> > create keyspace Keyspace1
> > with strategy_options=[{replication_factor:3}]
> > and placement_strategy =
> 'org.apache.cassandra.locator.SimpleStrategy';
> > use Keyspace1;
> > create column family TwitterTest
> > with default_validation_class = CounterColumnType
> > and replicate_on_write = true;
> > ====
> >
> > With any given batch_insert() I'm incrementing ~17,000 counters. I've
> backed
> > off a bit and started using ConsistencyLevel.QUORUM, as it was suggested
> > elsewhere that ANY or ONE could overwhelm the system.
> >
> > I hope I'm just doing something stupid and one you experienced folks can
> > point out my error.
> > Thanks in advance!
> > Ian
> > ==== MORE DATA ====
> > Address DC Rack Status State Load
> Owns
> > Token
> >
> > 113427455640312821154458202477256070484
> > 10.87.9.57 datacenter1 rack1 Up Normal 193.86 MB
> > 33.33% 0
> > 10.86.223.32 datacenter1 rack1 Up Normal 191.1 MB
> > 33.33% 56713727820156410577229101238628035242
> > 10.86.229.24 datacenter1 rack1 Up Normal 193.63 MB
> > 33.33% 113427455640312821154458202477256070484
> >
> >
> >
> > SEED
> > Pool Name Active Pending Completed
> > ReadStage 0 0 7
> > RequestResponseStage 0 0 1479839
> > MutationStage 0 0 1479908
> > ReadRepairStage 0 0 0
> > ReplicateOnWriteStage 0 0 0
> > GossipStage 0 0 5176
> > AntiEntropyStage 0 0 0
> > MigrationStage 0 0 128
> > MemtablePostFlusher 0 0 28
> > StreamStage 0 0 0
> > FlushWriter 0 0 28
> > MiscStage 0 0 2
> > FlushSorter 0 0 0
> > InternalResponseStage 0 0 363
> > HintedHandoff 0 0 0
> > NODE1
> > Pool Name Active Pending Completed
> > ReadStage 0 0 7
> > RequestResponseStage 0 0 2960208
> > MutationStage 0 0 1480104
> > ReadRepairStage 0 0 0
> > ReplicateOnWriteStage 0 0 1480104
> > GossipStage 0 0 4151
> > AntiEntropyStage 0 0 0
> > MigrationStage 0 0 128
> > MemtablePostFlusher 0 0 31
> > StreamStage 0 0 8
> > FlushWriter 0 0 31
> > MiscStage 0 0 8
> > FlushSorter 0 0 0
> > InternalResponseStage 0 0 1
> > HintedHandoff 0 0 0
> > NODE2
> > Pool Name Active Pending Completed
> > ReadStage 0 0 7
> > RequestResponseStage 0 0 0
> > MutationStage 0 0 1481530
> > ReadRepairStage 0 0 0
> > ReplicateOnWriteStage 0 0 0
> > GossipStage 0 0 4201
> > AntiEntropyStage 0 0 0
> > MigrationStage 0 0 128
> > MemtablePostFlusher 0 0 31
> > StreamStage 0 0 6
> > FlushWriter 0 0 31
> > MiscStage 0 0 6
> > FlushSorter 0 0 0
> > InternalResponseStage 0 0 1
> > HintedHandoff 0 0 0
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
>
