OA48933: NEW FUNCTION- CONCURRENT BROWSING TO SAME LOGSTREAM ON SAME SYSTEM USING SEPARATE BROWSE SESSIONS

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• NEW FUNCTION
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of HBB7790 and above supported         *
  *                 releases using System Logger Service         *
  *                 IXGBRWSE                                     *
  *                                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: System logger logstream browse level    *
  *                      latch is held exclusively for each      *
  *                      IXGBRWSE request for a logstream,       *
  *                      which can cause interference/impediment *
  *                      between browse requestors on the same   *
  *                      system when reading log data from the   *
  *                      same logstream.                         *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  IN SUPPORT OF NEW FUNCTION
  
  The logger browse (IXGBRWSE) processing employs an exclusive
  latch for each browse request for a given logstream.  This
  system scope latching means only one browse request for the
  logstream will be processed at a time.
  
  This singular sequential processing can cause interference
  between browse requestors and becomes an impediment when
  multiple, concurrent browsers from the same system are reading
  log data from the same logstream.
  
  The system logger browse (IXGBRWSE) service should be enhanced
  to allow concurrent log data browses (reads) on the same
  system to the logstream.
  

Problem conclusion

Temporary fix

Comments

• System logger has been enhanced to support concurrent logstream
  browse requests on the same system.
  
  See the Enhancement section for details.
  
  Activation of this enhancement on each system requires an IPL.
  
   Additional Searchable keywords:
     SYSPLEXDS
  
  
  ENHANCEMENT INFO FOR APAR OA48933
  
  This PTF provides an enhancement to the system logger browse
  (IXGBRWSE) service to allow multiple, concurrent log data
  browses (reads) on the same system for the same logstream.
  
  The intent of the logstream browse latching changes included in
  this enhancement is to allow parallelism/concurrency between
  separate browse sessions, but it will also continue to protect
  against concurrent service use of the same browse session.
  
  
  This PTF may be applied and activated on one system at a time
  in the sysplex.
  
  Systems with and without the PTF activated can coexist in the
  same sysplex.
  

APAR Information

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

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

  UA79883 UA79884

Modules/Macros

• IXGCON   IXGF2BRW
  

Fix information

• Fixed component name

  SYSTEM LOGGER

• Fixed component ID

  5752SCLOG

Applicable component levels

• R7A0 PSY UA79883

     UP15/12/09 P F512

• R790 PSY UA79884

     UP15/12/09 P F512

Fix is available

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