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From Piyush Kunal <>
Subject Re: SessionExpiredException
Date Sat, 06 May 2017 16:36:14 GMT
We already faced this issue and found out the issue to be long GC pauses
itself on either client side or server side.

On Sat, May 6, 2017 at 6:10 PM, Shawn Heisey <> wrote:

> On 5/3/2017 7:32 AM, Satya Marivada wrote:
> > I see below exceptions in my logs sometimes. What could be causing it?
> >
> > org.apache.zookeeper.KeeperException$SessionExpiredException:
> Based on my limited research, this would tend to indicate that the
> heartbeats ZK uses to detect when sessions have gone inactive are not
> occurring in a timely fashion.
> Common causes seem to be:
> JVM Garbage collections.  These can cause the entire JVM to pause for an
> extended period of time, and this time may exceed the configured timeouts.
> Excess client connections to ZK.  ZK limits the number of connections
> from each client address, with the idea of preventing denial of service
> attacks.  If a client is misbehaving, it may make more connections than
> it should.  You can try increasing the limit in the ZK config, but if
> this is the reason for the exception, then something's probably wrong,
> and you may be just hiding the real problem.
> Although we might have bugs causing the second situation, the first
> situation seems more likely.
> Thanks,
> Shawn

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