PM10894: CORE GROUP BRIDGE SERVICE INEFFICIENTLY CACHES SUBJECTS AND CAN CAUSE OUTOFMEMORY IN EXTREME CASES.

Fixes are available

APAR status

Closed as program error.

Error description

In core groups that do not have core group bridges configured,
a helper service of the core group bridge stores a small
amount of data (typically less than 500 KB) on the core group
coordinator in the event a core group bridge is added to the
topology.  However, this data does not get stored efficiently
and results in a small memory leak.  Over a period of time,
this can lead to an OutOfMemory on the core group coordinator.
The magnitude of the problem varies depending on the size of the
core group and the enabled services.  Typically, this problem
is not noticeable in most core groups.
.
One instance of
"com.ibm.ws.cgbridge.core.impl.CGBridgeSubscriptionRouter"
loaded
occupies 1,036,244,312 (96.51%) bytes. The memory is accumulated
in one
instance of "java.util.LinkedHashMap".

1,071,287,680 (97%) ?112? 17
  com/ibm/ws/hamanager/bboard/LocalBulletinBoardStateManager
0x48b390f8
 1,071,186,064 (97%) ?184? 28
   com/ibm/ws/hamanager/coordinator/impl/CoordinatorImpl
0x48acd420
  1,062,314,880 (96%) ?64? 8

com/ibm/ws/hamanager/coordinator/impl/GlobalBBoardUnifiedStateMa
nager
0x48b43f88
   1,062,314,144 (96%) ?32? 1 java/util/ArrayList 0x48b440d8
    1,062,314,112 (96%) ?32? 1 array of java/lang/Object
0x48b440f8
     1,062,314,080 (96%) ?152? 21
com/ibm/ws/cgbridge/core/impl/CGBridgeSubscriptionRouter
0x48e5e910
      1,062,292,104 (96%) ?16? 1 java/util/LinkedHashSet
0x48e5e9f8
       1,062,292,088 (96%) ?56? 4 java/util/LinkedHashMap
0x48e5ea08
        1,045,513,512 (94%) ?40? 4 java/util/LinkedHashMap
$LinkedHashMapEntry 0x7fe0dad0
         1,045,512,136 (94%) ?40? 5 java/util/LinkedHashMap
$LinkedHashMapEntry 0x7fe0da90
          1,045,510,936 (94%) ?40? 5 java/util/LinkedHashMap
$LinkedHashMapEntry 0x7fe0da50
           1,045,510,296 (94%) ?40? 5 java/util/LinkedHashMap
$LinkedHashMapEntry 0x7fe0da10

---> java.util.LinkedHashMap$LinkedHashMapEntry?2097152? @
0x7062d590
.
.------------------------------
One instance of
"com.ibm.ws.cgbridge.core.impl.CGBridgeSubscriptionRouter"
loaded
occupies 1,036,244,312 (96.51%) bytes. The memory is accumulated
in one
instance of "java.util.LinkedHashMap".

1,071,287,680 (97%) ?112? 17
  com/ibm/ws/hamanager/bboard/LocalBulletinBoardStateManager
0x48b390f8
 1,071,186,064 (97%) ?184? 28
   com/ibm/ws/hamanager/coordinator/impl/CoordinatorImpl
0x48acd420
  1,062,314,880 (96%) ?64? 8

com/ibm/ws/hamanager/coordinator/impl/GlobalBBoardUnifiedStateMa
nager
0x48b43f88
   1,062,314,144 (96%) ?32? 1 java/util/ArrayList 0x48b440d8
    1,062,314,112 (96%) ?32? 1 array of java/lang/Object
0x48b440f8
     1,062,314,080 (96%) ?152? 21
com/ibm/ws/cgbridge/core/impl/CGBridgeSubscriptionRouter
0x48e5e910
      1,062,292,104 (96%) ?16? 1 java/util/LinkedHashSet
0x48e5e9f8
       1,062,292,088 (96%) ?56? 4 java/util/LinkedHashMap
0x48e5ea08
.
.-----------------------------------
SystemOut from problem timeframe shows:
.
[2/6/11 12:29:16:450 EST] 0000b756 ODCGroup      W   ODCF0002E:
Exception: java.lang.OutOfMemoryError
 at java.lang.Class.getDeclaredFieldImpl(Native Method)
 at java.lang.Class.getDeclaredField(Class.java:510)
 at
java.io.ObjectStreamClass.getDeclaredSUID(ObjectStreamClass.java
:1622)
 at
java.io.ObjectStreamClass.access$700(ObjectStreamClass.java:64)
 at java.io.ObjectStreamClass$2.run(ObjectStreamClass.java:437)

Local fix

Problem summary

****************************************************************
* USERS AFFECTED:  All users of IBM WebSphere Application      *
*                  Server Network Deployment edition, V6.1     *
*                  and V7.0                                    *
****************************************************************
* PROBLEM DESCRIPTION: The core group bridge service does      *
*                      not properly cache subjects and         *
*                      causes a small memory leak.             *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Version 7.0 only:
In core groups that do not have core group bridges configured,
a helper service of the core group bridge stores a small
amount of data (typically less than 500 KB) on the core group
coordinator in the event a core group bridge is added to the
topology.  However, this data does not get stored efficiently
and results in a small memory leak.  Over a period of time,
this can lead to an out-of-memory condition on the core group
coordinator.  The magnitude of the problem varies depending on
the size of the core group and the enabled services.

Versions 7.0 and 6.1:
If a core group has a core group bridge configured and the core
group bridge is not used, then the helper service of the
core group bridge will store data in this case also.  Over a
period of time, this can also lead to an out-of-memory
condition on the core group coordinator.

NOTE:  Both of these scenarios are not problematic in typical
core group configurations due to the small amount of data
being stored.

Problem conclusion

The core group bridge service was modified to efficiently
store bulletin board subjects and prevent any related memory
leaks.

The fix for this APAR is currently targeted for inclusion in
fix packs 6.1.0.33 and 7.0.0.11.  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
PM10894
Reported component name
WEBS APP SERV N
Reported component ID
5724H8800
Reported release
60I
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-03-25
Closed date
2010-04-07
Last modified date
2011-11-09

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

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"6.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
24 October 2021

Tips

PM10894: CORE GROUP BRIDGE SERVICE INEFFICIENTLY CACHES SUBJECTS AND CAN CAUSE OUTOFMEMORY IN EXTREME CASES.

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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