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From Camille Fournier <cami...@apache.org>
Subject Re: ZK 3.4.5: Very Strange Write Latency Problem?
Date Fri, 21 Feb 2014 02:10:03 GMT
Can you share the test code somewhere (github maybe?)?


On Thu, Feb 20, 2014 at 9:08 PM, jmmec <jmmec2009@gmail.com> wrote:

> Thanks for the quick reply.
> I did not try the "slow" test using a normal disk drive, however I first
> discovered this problem when writing to a 7200RPM disk drive at a much
> higher messaging rate (e.g. 1500 to 3000 creates/sec rather than 84
> creates/sec).  This is what caused me to start simplifying the
> configuration trying to find the root cause.  As part of that
> investigation, I created a RAM disk to avoid the hard drive, but the hard
> drive wasn't the problem.  I just haven't switched back to the hard drive.
> I don't know what ZooKeeper is doing internally, or how & why it is
> deriving 76ms MAX latency.  The very regular periodic pattern suggests
> something odd.
> Hmmmm.....

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