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From Patrick Hunt <ph...@apache.org>
Subject Re: How to investigate these error codes
Date Tue, 16 Aug 2016 23:03:54 GMT
What version of the c client are you using - multi-threaded or single
threaded? If multi-threaded then the library (incl pthreads) will take care
of handling the periodic heartbeats for you. If single threaded then you
might be starving the event processing - which includes the heartbeat loop.
See the THREADED sections of cli.c for an example.

Patrick

On Mon, Aug 15, 2016 at 12:01 AM, Krizansky, Jan <jkrizansky@netsuite.com>
wrote:

> <html><bodyThank you Flavio for a swift answer.
> Yes, we're using the C client but we don't seem to have any network issues
> or load issues (in fact the setup is still in development mode so there is
> little to none traffic going through it).
> We have also set fairly high session timeout of 1,800,000 and a tickTime
> of 900,000. Yet we're getting SESSIONEXPIRED error even 2-3 times a minute.
> Are there any investigation steps you could recommend to pinpoint the
> problem?
>
> Thank you,
> Jan
>
> -----Original Message-----
> From: Flavio Junqueira [mailto:fpj@apache.org]
> Sent: Friday, August 12, 2016 6:05 PM
> To: user@zookeeper.apache.org
> Subject: Re: How to investigate these error codes
>
> Hi Jan,
>
> Connection loss means that the client has disconnected from the server it
> was connected to and it will try to connect to another server to avoid
> session expiration.
>
> Session expired means that your session has expired. :-)
>
> Session expiration is important because if you have ephemerals associated
> to that session, they will be gone, so it might trigger some recovery path
> in your application.
>
> You're using the C client? If so, then it is not going to be garbage
> collection on the client side causing your clients to disconnect, which is
> a pretty common cause for applications using the Java client. You may want
> to investigate if you're having some network issues or if perhaps your
> servers are overwhelmed with something. If you're sharing the disk devices
> and other applications are inducing a good number of IOs, then you may end
> up affecting the performance of the server.
>
> -Flavio
>
>
> > On 12 Aug 2016, at 15:39, Krizansky, Jan <jkrizansky@netsuite.com>
> wrote:
> >
> > <html><bodyHi ZK group,
> >
> > I'm trying to reach out to you as we couldn't find any satisfying info
> online.
> > We've recently started seeing some errors in our cluster. The prevailing
> one is ZSESSIONEXPIRED but there sometimes is also a ZCONNECTIONLOSS error.
> > We couldn't find any documentation about possible causes of these
> issues. Any recommendation where we should investigate and what might be
> causing these?
> >
> > The ZCONNECTIONLOSS error is fairly rare. But ZSESSIONEXPIRED is very
> common happening on almost every other hit.
> >
> > Thank you,
> >
> > Jan Krizansky
> >
> >
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> NOTICE: This email and any attachments may contain confidential and
> proprietary information of NetSuite Inc. and is for the sole use of the
> intended recipient for the stated purpose. Any improper use or distribution
> is prohibited. If you are not the intended recipient, please notify the
> sender; do not review, copy or distribute; and promptly delete or destroy
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