You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by Joachim Martin <jm...@hbs.edu> on 2004/09/08 17:42:48 UTC
session replication slow/problems in 5.0.28
Hello,
I have successfully gotten replication working. However, every 5-10
hits or so, the request takes forever, and I see the following in the log:
Sep 8, 2004 11:33:38 AM org.apache.catalina.cluster.tcp.SocketSender
waitForAck
WARNING: Wasn't able to read acknowledgement from server[/x.x.x.x:56831]
in 15000 ms. Disconnecting socket, and
trying again.
Is there a fix or workaround for this?
Thanks --Joachim
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
Re: session replication slow/problems in 5.0.28
Posted by Filip Hanik - Dev <de...@hanik.com>.
I believe the timeout is related to NIO hickups, and there were plenty in the Sun implementation.
See if you can get 1.4.2 working and if the error still occurs.
FIlip
----- Original Message -----
From: "Joachim Martin" <jm...@hbs.edu>
To: "Tomcat Users List" <to...@jakarta.apache.org>
Sent: Wednesday, September 08, 2004 11:06 AM
Subject: Re: session replication slow/problems in 5.0.28
Hi Filip,
SunOS 5.6 (from uname -a; not sure what that corresponds to)
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
I didn't realize I was using 1.4.0- I also have 1.4.2_04 available, and
tried it
quickly, but I got an unsatisfied link error on librt.so.1 (strange).
I added a simple page to the /jsp-examples/ webapp, it just puts an Integer
in session and increments on each request. I take down servers and make
sure that the hitcount keeps on going up. Works great except for the
timeout.
Thanks --Joachim
Filip Hanik - Dev wrote:
>ok, you want to find out what is taking so long, are you storing megabyte size stuff in your session?
>The socket is timing out cause it is not receiving an acknowledgement from the other server.
>Also, what OS and JDK are you on, if you are on linux, you will need to set LD_ASSUME_KERNEL=2.4 because of known NIO issues
>
>Filip
>
>----- Original Message -----
>From: "Joachim Martin" <jm...@hbs.edu>
>To: <to...@jakarta.apache.org>
>Sent: Wednesday, September 08, 2004 10:42 AM
>Subject: session replication slow/problems in 5.0.28
>
>
>Hello,
>
>I have successfully gotten replication working. However, every 5-10
>hits or so, the request takes forever, and I see the following in the log:
>
>Sep 8, 2004 11:33:38 AM org.apache.catalina.cluster.tcp.SocketSender
>waitForAck
>WARNING: Wasn't able to read acknowledgement from server[/x.x.x.x:56831]
>in 15000 ms. Disconnecting socket, and
>trying again.
>
>Is there a fix or workaround for this?
>
>Thanks --Joachim
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
Re: session replication slow/problems in 5.0.28
Posted by Joachim Martin <jm...@hbs.edu>.
Hi Filip,
SunOS 5.6 (from uname -a; not sure what that corresponds to)
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)
I didn't realize I was using 1.4.0- I also have 1.4.2_04 available, and
tried it
quickly, but I got an unsatisfied link error on librt.so.1 (strange).
I added a simple page to the /jsp-examples/ webapp, it just puts an Integer
in session and increments on each request. I take down servers and make
sure that the hitcount keeps on going up. Works great except for the
timeout.
Thanks --Joachim
Filip Hanik - Dev wrote:
>ok, you want to find out what is taking so long, are you storing megabyte size stuff in your session?
>The socket is timing out cause it is not receiving an acknowledgement from the other server.
>Also, what OS and JDK are you on, if you are on linux, you will need to set LD_ASSUME_KERNEL=2.4 because of known NIO issues
>
>Filip
>
>----- Original Message -----
>From: "Joachim Martin" <jm...@hbs.edu>
>To: <to...@jakarta.apache.org>
>Sent: Wednesday, September 08, 2004 10:42 AM
>Subject: session replication slow/problems in 5.0.28
>
>
>Hello,
>
>I have successfully gotten replication working. However, every 5-10
>hits or so, the request takes forever, and I see the following in the log:
>
>Sep 8, 2004 11:33:38 AM org.apache.catalina.cluster.tcp.SocketSender
>waitForAck
>WARNING: Wasn't able to read acknowledgement from server[/x.x.x.x:56831]
>in 15000 ms. Disconnecting socket, and
>trying again.
>
>Is there a fix or workaround for this?
>
>Thanks --Joachim
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>---------------------------------------------------------------------
>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
Re: session replication slow/problems in 5.0.28
Posted by Filip Hanik - Dev <de...@hanik.com>.
ok, you want to find out what is taking so long, are you storing megabyte size stuff in your session?
The socket is timing out cause it is not receiving an acknowledgement from the other server.
Also, what OS and JDK are you on, if you are on linux, you will need to set LD_ASSUME_KERNEL=2.4 because of known NIO issues
Filip
----- Original Message -----
From: "Joachim Martin" <jm...@hbs.edu>
To: <to...@jakarta.apache.org>
Sent: Wednesday, September 08, 2004 10:42 AM
Subject: session replication slow/problems in 5.0.28
Hello,
I have successfully gotten replication working. However, every 5-10
hits or so, the request takes forever, and I see the following in the log:
Sep 8, 2004 11:33:38 AM org.apache.catalina.cluster.tcp.SocketSender
waitForAck
WARNING: Wasn't able to read acknowledgement from server[/x.x.x.x:56831]
in 15000 ms. Disconnecting socket, and
trying again.
Is there a fix or workaround for this?
Thanks --Joachim
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-user-help@jakarta.apache.org