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From Ian Danforth <idanfo...@numenta.com>
Subject Re: tpstats confusion
Date Thu, 11 Aug 2011 21:55:00 GMT
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 <jbellis@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 <idanforth@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
>

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