JR54009: OUTOFMEMORY ERRORS WHEN MIGRATING SEVERAL MILLION INSTANCES DURING SNAPSHOT MIGRATION.

Version 8.5 Refresh Pack 7 for the IBM Business Process Manager products

APAR status

• Closed as fixed if next.

Error description

• OutOfMemory errors when migrating several million instances
  during snapshot migration.
  
  When migrating several million instances it may require
  upwards of 3-4 GB of heap space leading to Out of Memory errors
  if the JVM is not large enough.
  
  Part of this will be an instance ID array similar to this:
  1,397,526,832 (24.56%) [24] 1 java/util/ArrayList 0x7003c0db8
  |- 1,397,526,808 (24.56%) [38,780,464] 7,555,066 array of
  java/lang/Object 0x74dd3b0f0
     |- 256 (0%) [24] 1 java/lang/String 0x725169690
     |- 240 (0%) [24] 1 java/lang/String 0x728b46340
     |- 240 (0%) [24] 1 java/lang/String 0x72fda64d0
     |- 240 (0%) [24] 1 java/lang/String 0x72a8db910
     |- 240 (0%) [24] 1 java/lang/String 0x727abc780
     |- 240 (0%) [24] 1 java/lang/String 0x729b87000
  

Local fix

• Increase the heap size until the migration can succeed.
  

Problem summary

• When you migrate a large number of inflight process instances
  between snapshots, you might receive an OutOfMemory error that
  might cause the JVM to fail.
  
  
  PRODUCTS AFFECTED
  IBM Business Process Manager (BPM) Advanced
  IBM BPM Standard
  IBM BPM Express
  
  LOCAL FIX -
  None
  
  
  PROBLEM SUMMARY
  No additional information is available.
  
  PROBLEM CONCLUSION ?
  The fix is available for an IBM BPM V8.5.6.0 cumulative fix that
  uses heap memory more efficiently and does not retain as much
  memory at a time.
  
  To determine whether the cumulative fix is available and
  download it if it is, complete the following steps on Fix
  Central:
  
  1. Select IBM Business Process Manager with your edition from
  the product selector, the installed version to the fix pack
  level, and your platform, and then click Continue.
  2. Select Text, enter ?cumulative fix?, and click Continue.
  

Problem conclusion

Temporary fix

Comments

APAR Information

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

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

Fix information

Applicable component levels

• R856 PSY

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