Increasing size of the Server Thread Pool

Whilst running a clustered JMS application with 3 servers, I get the
following error from the client:
<JavaSocketMuxer> <There are: '3' active sockets, but the maximum number of
socket readers allowed by the configuration is: '2', you may want to alter
your configuration.>
The error occurs with both Native IO and Java IO.
There are two parameters that appear to affect the number of socket readers,
a parameter called:
"ThreadPoolPercentSocketReaders"
and
"ThreadPoolSize"
The first parameter is well documented, and is in the DTD for "config.xml".
The second parameter is not. The only reference in the documentation I have
found so far is in the FAQs document, where "ThreadPoolSize" is a parameter
of the <Server> element (as you'd expect). However, when I tried to set this
manually in "config.xml", the parameter was removed after a server restart.
Anyone know about the error and/or the server "ThreadPoolSize" parameter?
Thanks
Alan

This is a client-side configuration issue - you can configure it
(I'm not sure about exact syntax) like this (when starting the client):
java -Dweblogic.ThreadPoolSize=10 -Dweblogic.ThreadPoolPercentSocketReaders=60 ... your.client ...
Alan Magrath <[email protected]> wrote:
Whilst running a clustered JMS application with 3 servers, I get the
following error from the client:
<JavaSocketMuxer> <There are: '3' active sockets, but the maximum number of
socket readers allowed by the configuration is: '2', you may want to alter
your configuration.>
The error occurs with both Native IO and Java IO.
There are two parameters that appear to affect the number of socket readers,
a parameter called:
"ThreadPoolPercentSocketReaders"
and
"ThreadPoolSize"
The first parameter is well documented, and is in the DTD for "config.xml".
The second parameter is not. The only reference in the documentation I have
found so far is in the FAQs document, where "ThreadPoolSize" is a parameter
of the <Server> element (as you'd expect). However, when I tried to set this
manually in "config.xml", the parameter was removed after a server restart.
Anyone know about the error and/or the server "ThreadPoolSize" parameter?
Thanks
Alan--
Dimitri

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Aplication server thread pool problem

I'm using sun app server 8.
After some time from starting (and using) the server, it stops responding to clients.
When I change the max number of threads on server the number of clients it can serve before hanging folows the change. So I guess that some threads are not recycled.
But, I can't get full thread dump to see what's happening.
Also I can't get any thread pool monitoring information through asadmin.
(I can see that EJB's are all removed successfuly)
Any suggestions.
Thanks in advance.

First of all, thank you for helping me.
The client wasn't making problems, but server did. (I didn't said that I use the app. server on XP.)
For now I solved the problem by installing the new beta 2004Q4. It works fine now, it also has some thread monitoring in web console...
I was getting this, when I tried to monitor the thread-pool (it is set on HIGH):
asadmin> get -m server.thread-pools.thread-pool.thread-pool-1.*
No matches resulted from the wildcard expression.
CLI137 Command get failed.
If it means anything this is what I was getting when I do ctrl-break. (this thread dump stays the same even after server stops responding...)
Full thread dump Java HotSpot(TM) Client VM (1.4.2_04-b04 mixed mode):
"Thread-6" prio=5 tid=0x02edad08 nid=0xb40 runnable [331f000..331fd8c]
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:177)
at org.apache.commons.launcher.StreamConnector.run(StreamConnector.java:
115)
"Thread-5" prio=5 tid=0x02ebbb98 nid=0x8ac runnable [32df000..32dfd8c]
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:194)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:220)
at java.io.BufferedInputStream.read(BufferedInputStream.java:277)
- locked <0x10089900> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:90)
at org.apache.commons.launcher.StreamConnector.run(StreamConnector.java:
115)
"Signal Dispatcher" daemon prio=10 tid=0x0093dc18 nid=0x930 waiting on condition
[0..0]
"Finalizer" daemon prio=9 tid=0x008a5c20 nid=0xbd0 in Object.wait() [2b5f000..2b
5fd8c]
at java.lang.Object.wait(Native Method)
- waiting on <0x10502a00> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
- locked <0x10502a00> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x008a47f0 nid=0xb4 in Object.wait() [2b1
f000..2b1fd8c]
at java.lang.Object.wait(Native Method)
- waiting on <0x10502a68> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:429)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:115)
- locked <0x10502a68> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=0x000362a0 nid=0xc38 runnable [7f000..7fc3c]
at java.lang.Win32Process.waitFor(Native Method)
at org.apache.commons.launcher.LaunchTask.execute(LaunchTask.java:705)
at org.apache.tools.ant.Task.perform(Task.java:341)
at org.apache.tools.ant.Target.execute(Target.java:309)
at org.apache.tools.ant.Target.performTasks(Target.java:336)
at org.apache.tools.ant.Project.executeTarget(Project.java:1339)
at org.apache.commons.launcher.Launcher.start(Launcher.java:402)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at LauncherBootstrap.main(LauncherBootstrap.java:185)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.enterprise.admin.servermgmt.pe.PEInstancesManager.startInstan
ce(PEInstancesManager.java:115)
at com.sun.enterprise.admin.servermgmt.pe.PEDomainsManager.startDomain(P
EDomainsManager.java:126)
at com.sun.enterprise.cli.commands.StartDomainCommand.runCommand(StartDo
mainCommand.java:59)
at com.sun.enterprise.cli.framework.CLIMain.invokeCommand(CLIMain.java:1
23)
at com.sun.enterprise.cli.framework.CLIMain.main(CLIMain.java:39)
"VM Thread" prio=5 tid=0x0093c698 nid=0x9b4 runnable
"VM Periodic Task Thread" prio=10 tid=0x00940438 nid=0xbd4 waiting on condition
"Suspend Checker Thread" prio=10 tid=0x0093d2b8 nid=0x2c0 runnable

How can I use the same thread pool implementation for different tasks?

Dear java programmers,
I have written a class which submits Callable tasks to a thread pool while illustrating the progress of the overall procedure in a JFrame with a progress bar and text area. I want to use this class for several applications in which the process and consequently the Callable object varies. I simplified my code and looks like this:
        threadPoolSize = 4;
        String[] chainArray = predock.PrepareDockEnvironment();
        int chainArrayLength = chainArray.length;
        String score = "null";
        ExecutorService executor = Executors.newFixedThreadPool(threadPoolSize);
        CompletionService<String> referee = new ExecutorCompletionService<String>(executor);
        for (int i = 0; i < threadPoolSize - 1; i++) {
            System.out.println("Submiting new thread for chain " + chainArray);
referee.submit(new Parser(chainArray[i]));
for (int chainIndex = threadPoolSize; chainIndex < chainArrayLength; chainIndex++) {
try {
System.out.println("Submiting new thread for chain " + chainArray[chainIndex]);
referee.submit(new Parser(chainArray[i]));
score = referee.poll(10, TimeUnit.MINUTES).get();
System.out.println("The next score is " + score);
executor.shutdown();
int index = chainArrayLength - threadPoolSize;
score = "null";
while (!executor.isTerminated()) {
score = referee.poll(10, TimeUnit.MINUTES).get();
System.out.println("The next score is " + score);
index++;
My question is how can I replace Parser object with something changeable, so that I can set it accordingly whenever I call this method to conduct a different task?
thanks,
Tom

OK lets's start from the beginning with more details. I have that class called ProgressGUI which opens a small window with 2 buttons ("start" and "stop"), a progress bar and a text area. It also implements a thread pool to conducts the analysis of multiple files.
My main GUI, which is much bigger that the latter, is in a class named GUI. There are 3 types of operations which implement the thread pool, each one encapsulated in a different class (SMAP, Dock, EP). The user can set the necessary parameters and when clicking on a button, opens the ProgressGUI window which depicts the progress of the respective operation at each time step.
The code I posted is taken from ProgressGui.class and at the moment, in order to conduct one of the supported operations, I replace "new Parser(chainArray)" with either "new SMAP(chainArray[i])", "new Dock(chainArray[i])", "new EP(chainArray[i])". It would be redundant to have exactly the same thread pool implementation (shown in my first post) written 3 different times, when the only thing that needs to be changed is "new Parser(chainArray[i])".
What I though at first was defining an abstract method named MainOperation and replace "new Parser(chainArray[i])" with:
new Callable() {
public void call() {
    MainOperation();
});For instance when one wants to use SMAP.class, he would initialize MainOperation as:
public abstract String MainOperation(){
    return new SMAP(chainArray));
That's the most reasonable explanation I can give, but apparently an abstract method cannot be called anywhere else in the abstract class (ProgressGUI.class in my case).
Firstly it should be Callable not Runnable.Can you explain why? You are just running a method and ignoring any result or exception. However, it makes little difference.ExecutorCompletionService takes Future objects as input, that's why it should be Callable and not Runnable. The returned value is a score (String).
Secondly how can I change that runMyNewMethod() on demand, can I do it by defining it as abstract?How do you want to determine which method to run?The user will click on the appropriate button and the GUI will initialize (perhaps implicitly) the body of the abstract method MainOperation accordingly. Don't worry about that, this is not the point.
Edited by: tevang2 on Dec 28, 2008 7:18 AM

The different thread pools in 6.1

Boy am I just flooded with just 6.1 migration issues. Life was much
simpler with weblogic.properties file.
Looking at Config.Dtd I couldnt see the different thread pools that WLS
5.1 offered.
How do I do set up thread pools for
a) Servlets
b) RMI
c) JMS
In 5.1 you had a servletthreadpool, an executethreadcount(for RMI) and a
jms thread pool.

In 6.1
There isn't any seperate execute ThreadPool for servlets.
The only thread pool that you can tune is the default
queue which can be done via console. Ofcourse you can
configure user defined thread queues.
Also there are some internal thread pools that are not
exposed to the developers. for e.g. admin queue, replication
queue , console queue , rmi queue , jms queue etc....
If you still want to route your servlet requests via a
seperate thread queue, you have to specify
the dispatch policy & the queue name.
see below
http://e-docs.bea.com/wls/docs61/perform/AppTuning.html#1105201
Kumar
Aswin Dinakar wrote:
Boy am I just flooded with just 6.1 migration issues. Life was much
simpler with weblogic.properties file.
Looking at Config.Dtd I couldnt see the different thread pools that WLS
5.1 offered.
How do I do set up thread pools for
a) Servlets
b) RMI
c) JMS
In 5.1 you had a servletthreadpool, an executethreadcount(for RMI) and a
jms thread pool.

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<Error> <HTTP> <myserver> <myserver> <ExecuteThread: '0' for queue: 'default'>
<> <> <101083> <Connection failure>
java.net.ProtocolException: EOF after reading only: '49152' of: '1279958' promised
bytes, out of which at least: '0' were already buffered
     at weblogic.servlet.internal.PostInputStream.complain(PostInputStream.java:81)
     at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:172)
     at java.io.InputStream.skip(InputStream.java:219)
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     at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:462)
     at weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:491)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:989)
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     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
<Error> <HTTP> <myserver> <myserver> <ExecuteThread: '3' for queue: 'default'>
<> <> <101083> <Connection failure>
java.net.ProtocolException: EOF after reading only: '49152' of: '1279958' promised
bytes, out of which at least: '0' were already buffered
     at weblogic.servlet.internal.PostInputStream.complain(PostInputStream.java:81)
     at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:172)
     at java.io.InputStream.skip(InputStream.java:219)
     at weblogic.servlet.internal.ServletInputStreamImpl.skip(ServletInputStreamImpl.java:108)
     at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:462)
     at weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:491)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:989)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2209)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
<Error> <HTTP> <myserver> <myserver> <ExecuteThread: '0' for queue: 'default'>
<> <> <101104> <Servlet execution in servlet context "WebAppServletContext(5651275,WebApp,/WebApp)"
failed, java.net.ProtocolException: EOF after reading only: '49152' of: '1279958'
promised bytes, out of which at least: '0' were already buffered
Start server side stack trace:
java.net.ProtocolException: EOF after reading only: '49152' of: '1279958' promised
bytes, out of which at least: '0' were already buffered
     at weblogic.servlet.internal.PostInputStream.complain(PostInputStream.java:81)
     at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:172)
     at java.io.InputStream.skip(InputStream.java:219)
     at weblogic.servlet.internal.ServletInputStreamImpl.skip(ServletInputStreamImpl.java:108)
     at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:462)
     at weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:491)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:989)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2209)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
End server side stack trace
>
java.net.ProtocolException: EOF after reading only: '49152' of: '1279958' promised
bytes, out of which at least: '0' were already buffered
Start server side stack trace:
java.net.ProtocolException: EOF after reading only: '49152' of: '1279958' promised
bytes, out of which at least: '0' were already buffered
     at weblogic.servlet.internal.PostInputStream.complain(PostInputStream.java:81)
     at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:172)
     at java.io.InputStream.skip(InputStream.java:219)
     at weblogic.servlet.internal.ServletInputStreamImpl.skip(ServletInputStreamImpl.java:108)
     at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:462)
     at weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:491)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:989)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2209)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
End server side stack trace
     at weblogic.servlet.internal.PostInputStream.complain(PostInputStream.java:81)
     at weblogic.servlet.internal.PostInputStream.read(PostInputStream.java:172)
     at java.io.InputStream.skip(InputStream.java:219)
     at weblogic.servlet.internal.ServletInputStreamImpl.skip(ServletInputStreamImpl.java:108)
     at weblogic.servlet.internal.ServletOutputStreamImpl.commit(ServletOutputStreamImpl.java:462)
     at weblogic.servlet.internal.ServletOutputStreamImpl.finish(ServletOutputStreamImpl.java:491)
     at weblogic.servlet.internal.ServletResponseImpl.send(ServletResponseImpl.java:989)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2209)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

All,
Has anyone got solution for this. I am facing the same problem. Please throw light on this issue.
Thanks
Raj

Why do I keep gettingService Unavailable - Zero size object The server is temporarily unable to service your request. Please try again later. Reference #15.5610c50.1279470802.3ae16f5

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== URL of affected sites ==
http://

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JMS Thread Pool Size

Hi,
          I'm using WLS 6.1. The console has a setting for: JMS Thread Pool Size. I wanted to tune the number of threads used by JMS. I thought JMS asynch consumers would use threads in this pool however that doesn't seem to be the case (they all use the default execute threads and queues). Why is this setting available?
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Thread Pool Size

What can be the maximum thread pool size used in java.
What happens if i put up a thread pool size in range of 10k or 20k.
how does affect system performance ???
Its quite urgent for me to know. Can someone help out ???
Regards
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Setting Thread pool size

          Hi,
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Disregarding what it is for, in my experience, tuning this setting rarely has much effect. For 6.1, the main thread pool related tunables to look at are the EJB thread pools and EJB max-beans... settings, the "default" thread pool, and the internal thread-pool for stand-alone clients -- all of which are mentioned in the performance guide.

Increasing size of the Server Thread Pool

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