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 >>> >>> >
