<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:[email protected]] 
Sent: Friday, August 12, 2016 6:05 PM
To: [email protected]
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 <[email protected]> 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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