Hi,

I am using the FastAsyncSocketSender. Ngrep show me it sends a session and than 
receives 3 bytes (ack?). These 3 bytes are never read by the 
FastAsyncSocketSender, so the recv buffer of Linux is filling up. If the recv 
buffer is full. The send buffer on the other side is filled up after which the 
session replication halts.

Is it normal behaviour for FastAsyncSocketSender to not read the 3 bytes 
response?

Is can reproduce this on 5.5.20, 5.5.23 and 5.5.26.

Ronald.



On Mon Mar 17 12:15:30 CET 2008 Tomcat Users List <users@tomcat.apache.org> 
wrote:
Hello,

I have this problem in which there is very little data to get to a solution.
- Running a 5 node cluster of 5.5.23 on java 1.5.0_10. Debian 4.0 and kernel 
2.6.22.18-SMP.
- It runs behind a Linux LVS which balances the connections over the cluster.
- Attached is my server.xml.
- Sessions last for 8 hours, so customers can make a full workday while staying 
logged in.

This has run very stable for months. Nothing changed in handling sessions. The 
rest of the fixes were very small last weeks and I reviewed them more than ones 
and nothing related to sessions happened.
But since two weeks a lot of users are logged out now and than. This happens in 
bursts I think. If I restart every node in the cluster the problem disappears 
for a while (a day or a couple of hours).
Last week I upgraded to 5.5.26, but the problem is still there.
The logs give no errors.
I'm running Tomcat clusters for a couple of years now and solved a couple of 
problems with them, but now I have no clue in any logs about what is happening 
except users don't have a session anymore. (Possibly sessions aren't shared 
very well and after a 'load re-balancing' users get on a server which doesn't 
know the session.)

Are there any tips? How can I start debugging this? Is there a way to verify 
all servers have the same sessions?

Ronald.---------------------------------------------------------------------
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