PK66525: QMF WRITE ERROR TO DSQSPILL FILE:MESSAGE DSQ20855 OR MESSAGE DSQ60211 IF MULTIVOLUME SPILL DATA SET USED08/09/05 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After APPLY of PK61313/UK34094/UK34095, users can
  receive MSGDSQ20855 for a write error to the spill
  data set. Users can also receive MSGDSQ60211
  with or without PK61313 if the spill data set is
  allocated to multiple volumes.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All QMF for TSO/CICS V810 and V910 users.    *
  ****************************************************************
  * PROBLEM DESCRIPTION: After APPLY of PK61313/UK34094/UK34095, *
  *                      users can receive message DSQ20855      *
  *                      after a write error to the spill data   *
  *                      set.  Users can also receive message    *
  *                      DSQ60211 with or without PK61313 if the *
  *                      spill data set is allocated to multiple *
  *                      volumes.                                *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Problem 1: Write error that leads to issuance of message
  DSQ20855.
  APAR PK61313 tried to "Enforce a single volume spill file by
  issuing the POINT command prior to every WRITE" anticipating
  that POINT would fail if a second volume were detected.  POINT,
  which QMF issues in its default form, does not return an error
  code, so QMF cannot detect whether it completed successfully,
  and thus POINT cannot be used to detect multiple volumes.
  Additionally, a POINT past the end of a data set will result in
  an I/O error on the next READ or WRITE (documented by DFSMS).
  The end of the last extent is perceived as the end of a data set
  until a new extent is allocated.  If the spill data set needs a
  new extent, and a POINT past the end of the data set occurs
  before the WRITE invokes allocation of a new extent, QMF gets a
  WRITE error and drives a DCB exit, and a subsequent SAVE DATA
  command will fail because the spill file is incomplete.
  Prior to the change introduced by PK61313, POINTs were issued
  ONLY after READs.  Since we READ only records that we already
  wrote, a POINT after a READ will not point past the EOF.
  
  Problem 2: Read error that leads to the issuance of message
  DSQ60211.
  This problem can occur irrespective of changes introduced by
  PK61313, if the spill data set is allocated to more than one
  volume.  QMF will write records to a second volume, but when
  it tries to do a READ from the first volume, it is using TTR
  information from the second volume, and is thus positioned
  at an address inappropriate for the first volume.  This can
  drive an end-of-data DCB exit if it's past the end of the file.
  QMF issues message DSQ60211 indicating the recall spill buffer
  is not available.
  

Problem conclusion

• Problem 1:
  All the code introduced by PK61313 has been removed.  POINT
  cannot be used after WRITEs in this module, nor can it be used
  to detect a multivolume data set.  Checking for more than 65535
  tracks was removed because under current QMF limitations that
  require a non-extended format BSAM single volume DSQSPILL data
  set, z/OS will not allow users to allocate more than 65535
  tracks.  An ABENDB37-04 will occur when an attempt to allocate
  an extent that goes past the 64K limit occurs.
  
  Problem 2:
  Before the spill file is opened, the JFCB control block for
  the spill data set is examined to determine whether a second
  volume has been allocated.  The spill file will not be used if
  a second volume is detected, and message DSQ20855 will be
  issued with the volume names for the first and second volumes
  if a SAVE DATA command is issued.
  

Temporary fix

Comments

• ž**** PE08/09/29 FIX IN ERROR. SEE APAR PK72928  FOR DESCRIPTION
  ž**** PE08/10/15 FIX IN ERROR. SEE APAR PK73858  FOR DESCRIPTION
  

APAR Information

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

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

  UK40062 UK40063

Modules/Macros

• DSQCSIDT DSQDSAVX DSQPNLE  DXECVS   DXYE0468
  DXYE2405
  

Fix information

• Fixed component name

  QMF-QUERY MGMT

• Fixed component ID

  566872101

Applicable component levels

• R810 PSY UK40062

     UP08/09/24 P F809

• R910 PSY UK40063

     UP08/09/25 P F809

Fix is available

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