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From hajjat <haj...@purdue.edu>
Subject Re: Logging Cassandra Reads/Writes
Date Thu, 11 Jul 2013 16:46:19 GMT
Aaron,

Thanks for the references! I'll try the things you mentioned and see how it
goes!

Best,
Mohammad


On Wed, Jul 10, 2013 at 8:07 PM, aaron morton [via
cassandra-user@incubator.apache.org] <
ml-node+s3065146n7588930h30@n2.nabble.com> wrote:

> Some info on request tracing
> http://www.datastax.com/dev/blog/tracing-in-cassandra-1-2
>
> 1) Is it possible to log which node provides the real data in a read
> operation?
>
> It's available at the DEBUG level of logging. You probably just want to
> enable it on the org.apache.cassandra.db.StorageProxy class, see
> log4j-server.properties for info
>
> 2) Also, is it possible to log the different delays involved in each
> operation-- for example, 0.1 seconds to get digests from all nodes, 1
> second
> to transfer data, etc.?
>
> Not Applicable as you've seen, we request to all replicas at the same
> time. There is more logging that will show when the responses are
> processed, try turning DEBUG logging on for a small 3 node cluster and send
> one request.
>
> Cheers
>
>    -----------------
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 10/07/2013, at 8:58 AM, Mohit Anchlia <[hidden email]<http://user/SendEmail.jtp?type=node&node=7588930&i=0>>
> wrote:
>
> There is a new tracing feature in Cassandra 1.2 that might help you with
> this.
>
> On Tue, Jul 9, 2013 at 1:31 PM, Blair Zajac <[hidden email]<http://user/SendEmail.jtp?type=node&node=7588930&i=1>
> > wrote:
>
>> No idea on the logging, I'm pretty new to Cassandra.
>>
>> Regards,
>> Blair
>>
>> On Jul 9, 2013, at 12:50 PM, hajjat <[hidden email]<http://user/SendEmail.jtp?type=node&node=7588930&i=2>>
>> wrote:
>>
>> > Blair, thanks for the clarification! My friend actually just told me the
>> > same..
>> >
>> > Any idea on how to do logging??
>> >
>> > Thanks!
>> >
>> >
>> >
>> > --
>> > View this message in context:
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>>  > Sent from the [hidden email]<http://user/SendEmail.jtp?type=node&node=7588930&i=3>mailing
list archive at
>> Nabble.com.
>> >
>>
>
>
>
>
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-- 
*Mohammad Hajjat*
*Ph.D. Student*
*Electrical and Computer Engineering*
*Purdue University*




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