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From Tomàs Núnez <tomas.nu...@groupalia.com>
Subject Re: Logging Cassandra queries
Date Sat, 18 May 2013 22:20:16 GMT
Yes, I read how to do that here, as well:
http://www.datastax.com/docs/1.1/configuration/logging_options

But I didn't know what classes to enable logging for the queries... Is
there any document with the list of classes with a bit explanation for each
of them? I can't find any, and I don't understand java enough to dive
through the code....

Thanks!


2013/5/17 aaron morton <aaron@thelastpickle.com>

> And... could I be more precise when enabling logging? Because right now,
> with *log4j.rootLogger=DEBUG,stdout,R* I'm getting a lot of information I
> won't use ever, and I'd like to enable just what I need to see gets and
> seds….
>
>
> see the example at the bottom of this file about setting the log level for
> a single class
> https://github.com/apache/cassandra/blob/trunk/conf/log4j-server.properties
>
> You probably want to set it for the
> org.apache.cassandra.thrift.CassandraServer class. But I cannot remember
> what the logging is like in 0.8.
>
> Cassandra gets faster in the later versions, which normally means doing
> less work. Upgrading to 1.1 would be the first step I would take in
> improving performance.
>
> Cheers
>
> -----------------
> Aaron Morton
> Freelance Cassandra Consultant
> New Zealand
>
> @aaronmorton
> http://www.thelastpickle.com
>
> On 18/05/2013, at 4:00 AM, Tomàs Núnez <tomas.nunez@groupalia.com> wrote:
>
> Hi!
>
> For quite time I've been having some unexpected loadavg in the cassandra
> servers. I suspect there are lots of uncontrolled queries to the cassandra
> servers causing this load, but the developers say that there are none, and
> the load is due to cassandra internal processes.
>
> Trying to get to the bottom, I've been looking into completed ReadStage
> and MutationStage through JMX, and the numbers seem to confirm my theory,
> but I'd like to go one step forward and, if possible, list all the queries
> from the webservers to the cassandra cluster (just one node would be
> enough).
>
> I've been playing with cassandra loglevels, and I can see when a Read or a
> Write is done, but it would be better if I could knew the CF of the query.
> For my tests I've put the in the log4j.server
> " log4j.rootLogger=DEBUG,stdout,R", writing and reading a test CF, and I
> can't see the name of it anywhere.
>
> For the test I'm using Cassandra 0.8.4 (yes, still), as my production
> servers, and also 1.0.11. Maybe this changes in 1.1? Maybe I'm doing
> something wrong? Any hint?
>
> And... could I be more precise when enabling logging? Because right now,
> with *log4j.rootLogger=DEBUG,stdout,R* I'm getting a lot of information I
> won't use ever, and I'd like to enable just what I need to see gets and
> seds....
>
> Thanks in advance,
> Tomàs
>
>
>

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