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From Lakshman <lakshman...@huawei.com>
Subject Frequent SessionTimeoutException[Client] - CancelledKeyException[Server]
Date Wed, 07 Jul 2010 19:00:39 GMT
Hi Everyone, 
 
We are using zookeeper 3.3.1. And more frequently we are hitting
CancelledKeyException after startup of application.
Average response time is less than 50 milliseconds. But the last request
sent is not getting any response for 20 seconds so its timing out.
 
When analyzed, we found some possible problem with CommitRequestProcessor.
 
Following are the series of steps happening.
 
Client has sent some request[exists, setData, etc.] 
Server received the packet completely. That is submitted for processing.
[nextPending] 
Client has sent some ping requests after that.
Server has received the ping request as well and that is also queued up.
Client is timing out as it didn't get any response from server.
This is because ping requests are also getting queued up into
queuedRequests.
Its waiting for a commitedRequest for the current nextPending operation. 
 
As per my understanding pings request from client need not be queued up and
can be processed immediately.
 
Plz throw some pointers on this issue to me & do correct me if I went wrong.
--
Thanks & Regards
Laxman

 

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