Kbase P136353: Application server agent hangs in receiving mode running a web services request
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/03/2009 |
|
Status: Unverified
SYMPTOM(s):
Application server agent hangs in receiving mode running a web services request
Java Stack trace taken from the wsa1.wsa.log
SEVERE: Endpoint null ignored exception: java.net.SocketException: Too many open files
Stack Trace:
java.net.SocketException: Too many open files
at java.net.ServerSocket.createImpl(ServerSocket.java:255)
at java.net.ServerSocket.getImpl(ServerSocket.java:205)
at java.net.ServerSocket.bind(ServerSocket.java:319)
at java.net.ServerSocket.<init>(ServerSocket.java:185)
at java.net.ServerSocket.<init>(ServerSocket.java:141)
at org.apache.tomcat.util.net.DefaultServerSocketFactory.createSocket
netstat -a shows a huge number of ports in close_wait status
FACT(s) (Environment):
Application have a large number of requests at same time
OpenEdge 10.1x
SuSe Linux
Tomcat
Sun JDK 1.4
CAUSE:
A bug in SUSE JDK does not allow the sockets to close appropriately. The bug is described in the URL:http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6215050
FIX:
1 - Make sure the JDK is the minimum version reported in the bug fix
2 - Change the GC parameter to allow running the garbage collector more often and clear the pending closed sockets. An example of how changing the GC behavior by changing the startup command line:
-XX:MaxPermSize=128m -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+UseTLAB -XX:+CMSIncrementalMode -XX:+CMSIncrementalPacing -XX:CMSIncrementalDutyCycleMin=0 -XX:CMSIncrementalDutyCycle=10 -XX:MaxTenuringThreshold=0 -XX:SurvivorRatio=256 -XX:CMSInitiatingOccupancyFraction=60 -XX:+DisableExplicitGC
3 - Increase the number of total opened files and total opened files by process in the OS kernel.