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From Andrey Ilinykh <ailin...@gmail.com>
Subject Re: Cassandra nodes loaded unequally
Date Wed, 17 Oct 2012 16:19:11 GMT
Some of your column families are not fully compacted. But it is pretty
normal, I would not worry about it. Eventually it should happen.

On Wed, Oct 17, 2012 at 1:46 AM, Alain RODRIGUEZ <arodrime@gmail.com> wrote:
> I've got the same problem, and other people in the mailing list are
> reporting the same issue.
>
> I don't know what is happening here.
>
> RF 2, 2 nodes :
>
> 10.59.21.241    eu-west     1b          Up     Normal  137.53 GB
> 50.00%              0
> 10.58.83.109    eu-west     1b          Up     Normal  102.46 GB
> 50.00%              85070591730234615865843651857942052864
>
> I have no idea how to fix it.
>
> Alain
>
> 2012/10/17 Ben Kaehne <ben.kaehne@sirca.org.au>
>>
>> Nothing unusual.
>>
>> All servers are exactly the same. Nothing unusual in the log files. Is
>> there any level of logging that I should be turning on?
>>
>> Regards,
>>
>>
>> On Wed, Oct 17, 2012 at 9:51 AM, Andrey Ilinykh <ailinykh@gmail.com>
>> wrote:
>>>
>>> With your environment (3 nodes, RF=3) it is very difficult to get
>>> uneven load. Each node receives the same number of read/write
>>> requests. Probably something is wrong on low level, OS or VM. Do you
>>> see anything unusual in log files?
>>>
>>> Andrey
>>>
>>> On Tue, Oct 16, 2012 at 3:40 PM, Ben Kaehne <ben.kaehne@sirca.org.au>
>>> wrote:
>>> > Not connecting to the same node every time. Using Hector to ensure an
>>> > even
>>> > distribution of connections accross the cluster.
>>> >
>>> > Regards,
>>> >
>>> > On Sat, Oct 13, 2012 at 4:15 AM, B. Todd Burruss <btoddb@gmail.com>
>>> > wrote:
>>> >>
>>> >> are you connecting to the same node every time?  if so, spread out
>>> >> your connections across the ring
>>> >>
>>> >> On Fri, Oct 12, 2012 at 1:22 AM, Alexey Zotov
>>> >> <azotov@griddynamics.com>
>>> >> wrote:
>>> >> > Hi Ben,
>>> >> >
>>> >> > I suggest you to compare amount of queries for each node. May be
the
>>> >> > problem
>>> >> > is on the client side.
>>> >> > Yoy can do that using JMX:
>>> >> > "org.apache.cassandra.db:type=ColumnFamilies,keyspace=<YOUR
>>> >> > KEYSPACE>,columnfamily=<YOUR CF>","ReadCount"
>>> >> > "org.apache.cassandra.db:type=ColumnFamilies,keyspace=<YOUR
>>> >> > KEYSPACE>,columnfamily=<YOUR CF>","WriteCount"
>>> >> >
>>> >> > Also I suggest to check output of "nodetool compactionstats".
>>> >> >
>>> >> > --
>>> >> > Alexey
>>> >> >
>>> >> >
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > -Ben
>>
>>
>>
>>
>> --
>> -Ben
>
>

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