PM38550: OUTOFMEMORY DURING FAILOVER WITH MEMORY-TO-MEMORY SESSION REPLICATION

Fixes are available

APAR status

Closed as program error.

Error description

OutOfMemory occurs during bootstrap when fully populated
session data is being propagated to a newly joined application
server.

The OutOfMemoryError occurs in
DRSByteArrayPoolSet.getByteArray, but the
key stack frame is DRSSolicitor.handleSolicitEntryRequest. For
example:

at
com/ibm/ws/drs/pool/DRSByteArrayPoolSet.getByteArray(DRSByteArra
yPoolSet.java:168(Compiled Code))
at
com/ibm/ws/drs/message/DRSByteStream.growByteArray(DRSByteStream
.java:309(Compiled Code))
at
com/ibm/ws/drs/message/DRSByteStream.write(DRSByteStream.java:16
5(Compiled Code))
at
java/io/ObjectOutputStream$BlockDataOutputStream.write(ObjectOut
putStream.java:1822(Compiled Code))
at
java/io/ObjectOutputStream.write(ObjectOutputStream.java(Compile
d Code))
...
at
com/ibm/ws/drs/message/DRSBuffWrapper.storeObject(DRSBuffWrapper
.java:169(Compiled Code))
at
com/ibm/ws/drs/message/DRSMessageHelper.getSerializedForm(DRSMes
sageHelper.java:179(Compiled Code))
at
com/ibm/ws/drs/managers/DRSSolicitor.handleSolicitEntryRequest(D
RSSolicitor.java:345)
at
com/ibm/ws/drs/stack/DRSClientCallback.processRcvMessage(DRSClie
ntCallback.java:346(Compiled Code))
at
com/ibm/ws/drs/stack/DRSStack.processRcvMessage(DRSStack.java:29
5(Compiled Code))
at
com/ibm/ws/drs/DRSDomain.messageReceived(DRSDomain.java:614(Comp
iled Code))
...

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server using HTTP session memory to memory  *
*                  replication.                                *
****************************************************************
* PROBLEM DESCRIPTION: An out of memory can occur when an      *
*                      application server joins an             *
*                      established, fully populated            *
*                      replication domain.                     *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
The existing application servers will attempt to replicate
HTTP session data to the application server that is joining the
replication domain.  The Data Replication Service (DRS)
attempts to send the entire collection of HTTP session data in
one large message.  Serializing the large message can result
in an out of memory condition.

Problem conclusion

The DRS service will replicate HTTP session data in multiple
batches of 50 objects in each batch.  A JVM custom property is
being introduced to set the batch size,
DRS_BATCH_INTERVAL_SIZE. The default is 50.

To set a JVM custom property:
From the administrative console: Click Servers > Application
Servers > server > Java and Process Management > Process
Definition > Java Virtual Machine > Custom Properties.
Create a new custom property, if required, by clicking New,
then add DRS_BATCH_INTERVAL_SIZE in the name field and a
positive integer in the value field.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.1.0.41, 7.0.0.19 and 8.0.0.1.  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
PM38550
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2011-05-05
Closed date
2011-06-29
Last modified date
2011-06-29

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
WEBS APP SERV N
Fixed component ID
5724H8800

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
R800 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":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
27 October 2021

Tips

PM38550: OUTOFMEMORY DURING FAILOVER WITH MEMORY-TO-MEMORY SESSION REPLICATION

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

R800 PSY

Document Information

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