PK17967: USING THE IIOPTUNNELSERVLET WILL CAUSE INCOMING REQUESTS TO HANGDURING HEAVY LOAD. SMALLER LOAD IS HANDLED SUCCESSFULLY.

 Fixes are available

6.0.2.25: WebSphere Application Server V6.0.2 Fix Pack 25 for AIX platforms
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for HP-UX platforms
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for OS/400 platform
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for Solaris
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for Windows platforms
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for AIX platforms
6.0.2.25: WebSphere Application Server V6.0.2 Fix Pack 25 for HP-UX platforms
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for HP-UX platforms
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for AIX platforms
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Solaris
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Windows
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Windows
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for AIX
6.0.2.29: WebSphere Application Server V6.0.2 Fix Pack 29 for AIX platforms
6.0.2.29: WebSphere Application Server V6.0.2 Fix Pack 29 for HP-UX platforms
6.0.2.29: WebSphere Application Server V6.0.2 Fix Pack 29 for Linux platforms
V6.0.2: Java SDK 1.4.2 SR11 Cumulative Fix for IBM WebSphere Application Server
6.0.2.29: WebSphere Application Server V6.0.2 Fix Pack 29 for Solaris
6.0.2.29: WebSphere Application Server V6.0.2 Fix Pack 29 for Windows platforms
6.0.2.27: WebSphere Application Server V6.0.2 Fix Pack 27 for Linux platforms
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for HP-UX
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for AIX
5.0.2.17: WebSphere Application Server 5.0.2 Cumulative Fix 17 for Linux
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for HP-UX
6.0.2.9: WebSphere Application Server V6.0.2 Fix Pack 9 for Windows platforms
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Linux
6.0.2.11: WebSphere Application Server V6.0.2 Fix Pack 11 for Solaris platforms
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Solaris
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Windows
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for HP-UX
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for AIX
6.0.2.13: WebSphere Application Server V6.0.2 Fix Pack 13 for AIX platforms
6.0.2.13: WebSphere Application Server V6.0.2 Fix Pack 13 for HP-UX platforms
6.0.2.11: WebSphere Application Server V6.0.2 Fix Pack 11 for Windows platforms
6.0.2.11: WebSphere Application Server V6.0.2 Fix Pack 11 for HP-UX platforms
6.0.2.11: WebSphere Application Server V6.0.2 Fix Pack 11 for Linux platforms
6.0.2.13: WebSphere Application Server V6.0.2 Fix Pack 13 for Windows platforms
6.0.2.13: WebSphere Application Server V6.0.2 Fix Pack 13 for Linux platforms
6.0.2.15: WebSphere Application Server V6.0.2 Fix Pack 15 for OS/400
6.0.2.15: WebSphere Application Server V6.0.2 Fix Pack 15 for HP-UX
6.0.2.9: WebSphere Application Server V6.0.2 Fix Pack 9 for Solaris platforms
6.0.2.9: WebSphere Application Server V6.0.2 Fix Pack 9 for AIX platforms
6.0.2.9: WebSphere Application Server V6.0.2 Fix Pack 9 for HP-UX platforms
6.0.2.9: WebSphere Application Server V6.0.2 Fix Pack 9 for Linux platforms
6.0.2.25: WebSphere Application Server V6.0.2 Fix Pack 25 for Linux platforms
6.0.2.25: WebSphere Application Server V6.0.2 Fix Pack 25 for Solaris
6.0.2.25: WebSphere Application Server V6.0.2 Fix Pack 25 for Windows platforms
6.0.2.15: WebSphere Application Server V6.0.2 Fix Pack 15 for AIX
6.0.2.15: WebSphere Application Server V6.0.2 Fix Pack 15 for Solaris
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for AIX platforms
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for OS/400 platform
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for Solaris
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for Windows platforms
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for HP-UX platforms
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for AIX platforms
5.0.2.18: WebSphere Application Server 5.0.2 Cumulative Fix 18 for Linux
5.1.1.10: WebSphere Application Server V5.1.1 Cumulative Fix 10 for Solaris
6.0.2.11: WebSphere Application Server V6.0.2 Fix Pack 11 for AIX platforms
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for HP-UX platforms
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for Windows platforms
6.0.2.13: WebSphere Application Server V6.0.2 Fix Pack 13 for Solaris platform
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for OS/400 platform
6.0.2.21: WebSphere Application Server V6.0.2 Fix Pack 21 for HP-UX platforms
6.0.2.21: WebSphere Application Server V6.0.2 Fix Pack 21 for Linux platforms
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for Windows platforms
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for Solaris
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for OS/400 platform
6.0.2.15: WebSphere Application Server V6.0.2 Fix Pack 15 for Windows
6.0.2.23: WebSphere Application Server V6.0.2 Fix Pack 23 for Linux platforms
6.0.2.21: WebSphere Application Server V6.0.2 Fix Pack 21 for AIX platforms
6.0.2.21: WebSphere Application Server V6.0.2 Fix Pack 21 for Windows platforms
6.0.2.21: WebSphere Application Server V6.0.2 Fix Pack 21 for Solaris platforms
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for Solaris
6.0.2.17: WebSphere Application Server V6.0.2 Fix Pack 17 for Linux platforms
6.0.2.19: WebSphere Application Server V6.0.2 Fix Pack 19 for Linux platforms
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for AIX platforms
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for HP-UX platforms
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for OS/400 platform
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for Linux platforms
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for Solaris
6.0.2.31: WebSphere Application Server V6.0.2 Fix Pack 31 for Windows platforms
V6.0.2: Java SDK 1.4.2 SR11 Cumulative Fix for IBM WebSphere Application Server



APAR status
Closed as program error.

Error description
When using the com.ibm.CORBA.services.IIOPTunnelServlet, a small
amount of load is handled successfully.  However, when
the load is increased, the requests just seem to hang and
do not return.

The problem occurs only when there are multiple requests which
arrive at the same time and each must be handled in sequence,
not in parallel.
Local fix Problem summary
****************************************************************
* USERS AFFECTED: WebSphere Application Servers users of the   *
*                 IIOP HTTP Tunnel (IIOPTunnelServlet)         *
****************************************************************
* PROBLEM DESCRIPTION: Increased load to the IIOP HTTP Tunnel  *
*                      servlet can cause client requests to    *
*                      time out.                               *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The WebSphere IIOP HTTP Tunnel servlet serializes all client
requests to the same target host/port through the same
TCP/IP socket.  This causes a bottleneck that can cause
client requests through the tunnel to the same target
host/port to time out.
Problem conclusion
The IIOP HTTP Tunnel Servlet
(com.ibm.CORBA.services.IIOPTunnelServlet) was modified so
that it will maintain a cache of sockets for use to each target
host/port.  The maximum number of sockets to maintain in the
cache for each target host/port is customizable with a new ORB
property:

com.ibm.ws.orb.services.redirector.MaxOpenSocketsPerEndpoint

MaxOpenSocketsPerEndpoint defaults to 3.  If a new client
request is received for a target host/port that already has
the maximum number of sockets cached, a new socket will be
opened for this new request that will subsequently be closed
after the reply is sent back to the client.

A request timeout was also added to the IIOP HTTP Tunnel
servlet.  The following ORB property was added:

com.ibm.ws.orb.services.redirector.RequestTimeout

This specifies the number of seconds the IIOPTunnelServlet
should wait before timing out when waiting on a reply from
the target server on behalf of the client.  If not specified,
or specified improperly, this property will default to the
current setting for com.ibm.CORBA.RequestTimeout on the
Application Server on which the IIOPTunnelservlet is installed.
This preperty should be set to at least as high as the highest
client setting for com.ibm.CORBA.RequestTimeout, otherwise the
IIOPTunnelServlet could time out waiting on a reply before the
client ordinarily would.  If this property is set to zero, the
IIOPTunnelServlet will not time out.

This is apar is targetted for inclusion in the following
releases:

5.0.2.16
5.1.1.10
6.0.2.9

Please refer to the recommended updates page for delivery
information:

http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
Temporary fix Comments
APAR information
APAR number PK17967
Reported component name WAS BASE 5.0
Reported component ID 5630A3600
Reported release 00W
Status CLOSED PER
PE NoPE
HIPER NoHIPER
Special Attention NoSpecatt
Submitted date 2006-01-16
Closed date 2006-03-09
Last modified date 2006-03-09

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Modules/Macros
ORB          

Publications Referenced

Fix information
Fixed component name WAS BASE 5.0
Fixed component ID 5630A3600

Applicable component levels
R003 PSY    UP
R00A PSY    UP
R00H PSY    UP
R00I PSY    UP
R00W PSY    UP
R103 PSY    UP
R10A PSY    UP
R10H PSY    UP
R10I PSY    UP
R10S PSY    UP
R10W PSY    UP


Document Information


Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server > General
Operating system(s):
Software version: 00W
Software edition:
Reference #: PK17967
IBM Group: Software Group
Modified date: Mar 9, 2006