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From Jaydeep Chovatia <chovatia.jayd...@gmail.com>
Subject Re: Write timeout under load but Read is fine
Date Thu, 05 Mar 2015 19:17:42 GMT
I have tried increasing timeout to 10000 but no help. Also verified that
there is no network lost packets.

Jaydeep

On Wed, Mar 4, 2015 at 12:19 PM, Jan <cnet62@yahoo.com> wrote:

> HI Jaydeep;
>
>
>    - look at the i/o  on all three nodes
>    - Increase the write_request_timeout_in_ms: 10000
>    - check the time-outs if any on the client inserting the Writes
>    - check the Network for  dropped/lost packets
>
>
> hope this helps
> Jan/
>
>
>
>   On Wednesday, March 4, 2015 12:26 PM, Jaydeep Chovatia <
> chovatia.jaydeep@gmail.com> wrote:
>
>
> Hi,
>
> In my test program when I increase load then I keep getting few "write
> timeout" from Cassandra say every 10~15 mins. My read:write ratio is
> 50:50. My reads are fine but only writes time out.
>
> Here is my Cassandra details:
> Version: 2.0.11
> Ring of 3 nodes with RF=3
> Node configuration: 24 core + 64GB RAM + 2TB
>
> "write_request_timeout_in_ms: 5000", rest of Cassandra.yaml configuration
> is default
>
> I've also checked IO on Cassandra nodes and looks very low (around 5%).
> I've also checked Cassandra log file and do not see any GC happening. Also
> CPU on Cassandra is low (around 20%). I have 20GB data on each node.
>
> My test program creates connection to all three Cassandra nodes and sends
> read+write request randomly.
>
> Any idea what should I look for?
>
> Jaydeep
>
>
>


-- 
Jaydeep

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