APAR status
Closed as program error.
Error description
Heap memory usage from amqzsla0 processes increase over time. This memory use may eventually cause available memory on the system to be exhausted.
Local fix
There are a couple of workarounds: 1. Use SHARED or FAST bindings. 2. Restart the queue manager regularly.
Problem summary
**************************************************************** USERS AFFECTED: Users of isolated bindings who use large messages may encounter this problem.	 Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: The code used to communicate between applications and the queue manager allocates buffers large enough to hold full copies of MQ messages. The design intention is that these buffers are resized if a large message is followed by smaller messages but the code to do this was incorrect. In a system which handles a lot of large messages, amqzlsa0 processes may be seen to be using a large amount of memory.
Problem conclusion
The IBM MQ code has been corrected so that message buffers are correctly resized if they are larger than is needed. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.13 v9.0 LTS 9.0.0.8 v9.1 CD 9.1.3 v9.1 LTS 9.1.0.3 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT28706
Reported component name
IBM MQ BASE MP
Reported component ID
5724H7271
Reported release
910
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-04-06
Closed date
2021-01-25
Last modified date
2021-01-25
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
IBM MQ BASE MP
Fixed component ID
5724H7271
Applicable component levels
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]
Document Information
Modified date:
26 January 2021