zookeeper-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Neha Narkhede <neha.narkh...@gmail.com>
Subject Re: determining ZK latency issues
Date Thu, 08 Aug 2013 18:40:01 GMT
Since this zookeeper cluster is a pre-prod cluster and is used heavily, we
have turned the forceSync to OFF. So we don't see the fsync warnings on
this zookeeper cluster.

Thanks,
Neha


On Thu, Aug 8, 2013 at 11:18 AM, Martin Kou <bitanarch@gmail.com> wrote:

> Do you see fsync() warnings in your ZooKeeper log? It could be disk writes
> taking too long.
>
> Best Regards,
> Martin Kou
>
>
> On Thu, Aug 8, 2013 at 10:37 AM, Jun Rao <junrao@gmail.com> wrote:
>
> > Hi,
> >
> > We have a 3-node ZK cluster running 3.3.4 that are experiencing high
> > latency. From "stat", we saw avg latency to be 300-400ms consistently.
> > Outstanding requests jumps to ~600 from time to time. However, the
> server's
> > I/O and CPU are both low. If I start a new ZK client and do a few writes,
> > the observed response time in the client is also low (1ms).
> >
> > What's the best way to figure out why the reported latency in ZK server
> is
> > high? Also, are  min/avg/max latency computed on a rolling time window?
> >
> > Thanks,
> >
> > Jun
> >
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message