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
>>>>
>>>>
>>

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