here is the output: every node in a single DC is in the same rack. Datacenter: WDC5
================ Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 10.125.138.33 299.22 GB 256 64.2% 8aaa6015-d444-4551-a3c5-3257536df476 RAC1 UN 10.125.138.125 329.38 GB 256 70.3% 70be44a2-de17-41f1-9d3a-6a0be600eedf RAC1 UN 10.125.138.129 305.11 GB 256 65.5% 0fbc7f44-7062-4996-9eba-2a05ae1a7032 RAC1 Datacenter: WDC =============== Status=Up/Down |/ State=Normal/Leaving/Joining/Moving -- Address Load Tokens Owns (effective) Host ID Rack UN 10.124.114.105 151.09 GB 256 38.0% c432357d-bf81-4eef-98e1-664c178a3c23 RAC1 UN 10.124.114.110 150.15 GB 256 36.9% 6f92d32e-1c64-4145-83d7-265c331ea408 RAC1 UN 10.124.114.108 170.1 GB 256 41.3% 040ae7e5-3f1e-4874-8738-45edbf576e12 RAC1 UN 10.124.114.98 165.34 GB 256 37.6% cdc69c7d-b9d6-4abd-9388-1cdcd35d946c RAC1 UN 10.124.114.113 145.22 GB 256 35.7% 1557af04-e658-4751-b984-8e0cdc41376e RAC1 UN 10.125.138.59 162.65 GB 256 38.6% 9ba1b7b6-5655-456e-b1a1-6f429750fc96 RAC1 UN 10.124.114.97 164.03 GB 256 36.9% c918e497-498e-44c3-ab01-ab5cb4d48b09 RAC1 UN 10.124.114.118 139.62 GB 256 35.1% 2bb0c265-a5d4-4cd4-8f50-13b5a9a891c9 RAC1 On Thu, Apr 14, 2016 at 4:48 AM, Eric Stevens <migh...@gmail.com> wrote: > The output of nodetool status would really help answer some questions. I > take it the 8 hosts in your graph are in the same DC. Are the four serving > writes in the same logical or physical rack (as Cassandra sees it), while > the others are not? > > On Tue, Apr 12, 2016 at 10:48 PM Anishek Agarwal <anis...@gmail.com> > wrote: > >> We have two DC one with the above 8 nodes and other with 3 nodes. >> >> >> >> On Tue, Apr 12, 2016 at 8:06 PM, Eric Stevens <migh...@gmail.com> wrote: >> >>> Maybe include nodetool status here? Are the four nodes serving reads in >>> one DC (local to your driver's config) while the others are in another? >>> >>> On Tue, Apr 12, 2016, 1:01 AM Anishek Agarwal <anis...@gmail.com> wrote: >>> >>>> hello, >>>> >>>> we have 8 nodes in one cluster and attached is the traffic patterns >>>> across the nodes. >>>> >>>> its very surprising that only 4 nodes show transmitting (purple) >>>> packets. >>>> >>>> our driver configuration on clients has the following load balancing >>>> configuration : >>>> >>>> new TokenAwarePolicy( >>>> new >>>> DCAwareRoundRobinPolicy(configuration.get(Constants.LOCAL_DATA_CENTRE_NAME, >>>> "WDC")), >>>> true) >>>> >>>> >>>> any idea what is that we are missing which is leading to this skewed >>>> data read patterns >>>> >>>> cassandra drivers as below: >>>> >>>> <dependency> >>>> <groupId>com.datastax.cassandra</groupId> >>>> <artifactId>cassandra-driver-core</artifactId> >>>> <version>2.1.6</version> >>>> </dependency> >>>> <dependency> >>>> <groupId>com.datastax.cassandra</groupId> >>>> <artifactId>cassandra-driver-mapping</artifactId> >>>> <version>2.1.6</version> >>>> </dependency> >>>> >>>> cassandra version is 2.0.17 >>>> >>>> Thanks in advance for the help. >>>> >>>> Anishek >>>> >>>> >>