PM30543: DUPLICATE HTTP CHANNEL BUFFERS CAUSE HIGH CPU

Fixes are available

APAR status

Closed as program error.

Error description

When exceptions occur writing to a buffer:

[9/30/10 1:12:57:164 EDT] 000000a8 AioTCPWriteRe 1   IOException
while processing sync write. request local: /192.168.1.100:12345
remote: host.domain.com/192.168.0.100:12345

[9/30/10 1:12:57:164 EDT] 000000a8 AioTCPWriteRe 1   Exception
is: com.ibm.io.async.AsyncTimeoutException(Async operation timed
out, [Timeout, rc=0])

a new connection is established, causing duplicate buffers to be
created.  This eventually causes a high CPU issue.

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  IBM WebSphere Application Server Version    *
*                  6.1 and 7.0 users of Remote Request         *
*                  Dispatcher (RRD) and dynamic cache.         *
****************************************************************
* PROBLEM DESCRIPTION: Unnecessary high CPU utilization when   *
*                      using RRD.                              *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Analysis of the High CPU shows a thread consuming most of the
CPU which includes this in its call stack :

at
com/ibm/ws/ssl/channe/impl/SSLWriteServiceContext.encryptMessage
(SSLWriteServiceContext.java:571(Compiled Code))
at
com/ibm/ws/ssl/channel/impl/SSLWriteServiceContext.write(SSLWrit
eServiceContext.java:132)
at
com/ibm/ws/http/channel/outbound/impl/HttpOutboundServiceContext
Impl.nowReconnectedSync(HttpOutboundServiceContextImpl.java:446)
at
com/ibm/ws/http/channel/outbound/impl/HttpOutboundServiceContext
Impl.reConnect(HttpOutboundServiceContextImpl.java:268)
at
com/ibm/ws/http/channel/outbound/impl/HttpOutboundServiceContext
Impl.sendRequestBody(HttpOutboundServiceContextImpl.java:962
(Compiled Code))
at
com/ibm/ws/rrd/dynacache/HttpEsiInvalidatorServletListener.bodyR
eady(HttpEsiInvalidatorServletListener.java:537(Compiled Code))
at
com/ibm/ws/rrd/dynacache/HttpChunkedStreamHandler.complete(HttpC
hunkedStreamHandler.java:287(Compiled Code))
at
com/ibm/ws/http/channel/impl/HttpServiceContextImpl.continueRead
(HttpServiceContextImpl.java:4451(Compiled Code))

This is caused by the RRD dynacache component sending incorrect
responses to repeated getpid requests from the same client.

Problem conclusion

The RRD dynacache code has been updated to respond correctly
to getpid requests.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.1.0.39 and 7.0.0.17.  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
PM30543
Reported component name
WEBSPHERE APP S
Reported component ID
5724J0800
Reported release
61Z
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-01-14
Closed date
2011-03-25
Last modified date
2011-03-25

APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name
WEBSPHERE APP S
Fixed component ID
5724J0800

Applicable component levels

R61A PSY
UP
R61H PSY
UP
R61I PSY
UP
R61P PSY
UP
R61S PSY
UP
R61W PSY
UP
R61Z PSY
UP
R700 PSY
UP

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.1","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 October 2021

Tips

PM30543: DUPLICATE HTTP CHANNEL BUFFERS CAUSE HIGH CPU

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

APAR is sysrouted FROM one or more of the following:

APAR is sysrouted TO one or more of the following:

Fix information

Fixed component name

Fixed component ID

Applicable component levels

R61A PSY

R61H PSY

R61I PSY

R61P PSY

R61S PSY

R61W PSY

R61Z PSY

R700 PSY

Document Information

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