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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: tpstats confusion
Date Thu, 11 Aug 2011 21:56:25 GMT
https://issues.apache.org/jira/browse/CASSANDRA-2889

On Thu, Aug 11, 2011 at 2:55 PM, Ian Danforth <idanforth@numenta.com> wrote:
> 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
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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