IC88062: GLOBAL CACHE CAN LOSE DATA WHEN MACHINE FAILS IN ACTIVE/ACTIVE HA

WebSphere Message Broker V8.0 - Fix Pack 8.0.0.2

APAR status

• Closed as program error.

Error description

• Global Cache allows its WebSphere eXtreme Scale components to
  place the primary and replica shard for a piece of data on the
  same physical host, leading to loss of this data if that host
  fails. It should instruct the WXS components to place the
  primary and replica on different hosts if it detects that the
  cache topology has more than one catalog server, on more than
  one host.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of WebSphere Message Broker V8.0.0.1 using the
  Global Cache feature.
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM SUMMARY:
  If a set of brokers or execution groups are configured to
  share data using the Global Cache feature (introduced in
  8.0.0.1) across multiple systems, then data loss can occur if
  a primary shard and corresponding secondary shard are located on
  the same system, and that system goes down. The Global Cache
  functionality should place the secondary shard on another
  system, so that the data continues to be available even if the
  system hosting the primary shard goes down.
  

Problem conclusion

• WebSphere Message Broker has been modified to correctly place
  the secondary shard on a different system to the primary shard
  when the Global Cache is being used to share data across
  multiple systems.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Platform           v8.0
  --------           --------------------
  Multiplatforms     8.0.0.2
  
  The latest available maintenance can be obtained from
  'WebSphere Message Broker Recommended Fixes'
  http://www.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available, information on
  its planned availability can be found in 'WebSphere Message
  Broker Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

• Fixed component name

  WEB MESSAGE BRO

• Fixed component ID

  5724J0520

Applicable component levels

• R800 PSY

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