PM84864: IFI306 READS RETURNS THE WRONG LOG RANGE.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• IFI306 READS in data sharing mode might return
  some log records with an LRSN value that is higher
  than the end-of-scope LRSN, due to a very
  small timing window.
  .
  Example of the records returned.
  1            READS 'F' call
  10          :EOS recs=0478 rc=04 rsn=00E60812
  11          From member id 1
  13          From member id 1
  .
  10           READS 'F' call with EOS (10)
  20          :EOS recs=0372  rc=04 ren=00E60812
  12          From member id 2
  14          From member id 2.
  .
  IFCID0306 IFCID306 IFI0306
  ASN0633W
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All data sharing users of the IFI READS for  *
  *                 IFCID 306 facility to read log data from     *
  *                 DB2 for zOS.                                 *
  ****************************************************************
  * PROBLEM DESCRIPTION: A small timing window can result in     *
  *                      log records being returned to the       *
  *                      IFI READS for IFCID 306 application     *
  *                      with an LRSN value that is beyond the   *
  *                      end-of-scope LRSN for the requested     *
  *                      F-call, N-call sequence.                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DSNJR001 can incorrectly update the end-LRSN value in the
  log read cursor for the host member with a value that is
  higher than the requested LRSN range.  This can occur if
  the log writer is updating the high written LRSN value in
  the LMB block in a very small window when DSNJR001 is
  validating the requested LRSN range.  This can cause IFI to
  return some log records with an LRSN value that is higher
  than the end-of-scope LRSN value (QW0306ES).
  When running QREP Capture, this can result in MSGASN0633W
  and possible missing log data.
  
  IDAAV4R1/K
  

Problem conclusion

• The incorrect code in DSNJR001 has been corrected to close
  this timing window.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

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

  UK92982 UK92983

Modules/Macros

• DSNJR001
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY UK92982

     UP13/04/12 P F304

• R910 PSY UK92983

     UP13/04/12 P F304

Fix is available

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