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From Brian Burruss <bburr...@real.com>
Subject RE: read latency creaping up
Date Mon, 14 Dec 2009 23:16:11 GMT
i agree.  i don't know anything about thrift, and i don't know how it keeps connections open
or manages resources from a client or server perspective, but this situation suggests that
maybe killing the clients is forcing the server to free something.

how's that sound :)

________________________________________
From: Jonathan Ellis [jbellis@gmail.com]
Sent: Monday, December 14, 2009 3:12 PM
To: cassandra-user@incubator.apache.org
Subject: Re: read latency creaping up

hmm, me neither

but, I can't think how restarting the client would, either :)

On Mon, Dec 14, 2009 at 4:59 PM, Brian Burruss <bburruss@real.com> wrote:
> Well not sure how that would affect he latency as reported by the Cassandra server using
nodeprobe cfstats
>
> Jonathan Ellis <jbellis@gmail.com> wrote:
>
>
> possibly the clients are running into memory pressure?
>
> On Mon, Dec 14, 2009 at 4:27 PM, Brian Burruss <bburruss@real.com> wrote:
>> thx, i'm actually the "B. Todd Burruss" in that thread ..  we changed our email system
and well now, i'm just Brian .. long story.
>>
>> anyway, in this case it isn't compaction pendings as i can kill the clients and immediately
restart and the latency is back to a reasonable number.  i'm still investigating.
>>
>> thx!
>> ________________________________________
>> From: Eric Evans [eevans@rackspace.com]
>> Sent: Monday, December 14, 2009 8:23 AM
>> To: cassandra-user@incubator.apache.org
>> Subject: RE: read latency creaping up
>>
>> On Sun, 2009-12-13 at 13:18 -0800, Brian Burruss wrote:
>>> if this isn't a known issue, lemme do some more investigating.  my
>>> test client becomes "more random" with reads as time progresses, so
>>> possibly this is what causes the latency issue.  however, all that
>>> being said, the performance really becomes bad after a while.
>>
>> Have a look at the following thread:
>>
>> http://thread.gmane.org/gmane.comp.db.cassandra.user/1402
>>
>>
>> --
>> Eric Evans
>> eevans@rackspace.com
>>
>>
>

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