On 04/22/2015 05:15 PM, Christopher Schultz wrote:
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Frederik,
On 4/22/15 10:53 AM, Frederik Nosi wrote:
Hi, On 04/22/2015 04:35 PM, Christopher Schultz wrote: Neill,
On 4/22/15 9:12 AM, Neill Lima wrote:
If I am not wrong, if the application in question is
monitored in VisualVM through JMX
(https://visualvm.java.net/) you could trigger a Force GC
from its monitoring console.
You can do this, but it won't close any CLOSE_WAIT connections.
Tomcat's timeout must be reached. I suspect that the timeout(s)
are simply way too long.
You can tune the network stack's timeout using sysctl, eg:
net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 3
This won't do anything, either. As far as the OS is concerned, the
application (Tomcat) is still using that connection. Therefore it
can't be cleaned up.
Indeed you are right, tuning the network stack help with TIME_WAIT, not
CLOSE_WAIT, my bad.
Tomcat has to actively hang up the connection, and the best way to do
that is with synchronized timeouts between the reverse proxy and Tomcat.
You can try all other kinds of tricks, but the fact of the matter is
that the application is still trying to use the socket, so no other
component can step-in and kill it.
Probably the application is slow then, or the server overloaded.
- -chris
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