PH67593: WHEN A LOG RECORD DOESN'T FIT IN TWO BUFFERS, THE SECOND BUFFER IS OVERRUN.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The stored procedure log reader splits up log records to fit in
  its 32000 byte buffer. When a log record doesn't fit into one
  buffer, it is split into two parts. The first part fills the
  first buffer and the second part is written to the next buffer.
  When a log record doesn't fit in two buffers, the second buffer
  is overrun.
  
  The same faulty logic exists in the started task log reader but
  it is harder to hit. The started task log reader has a default
  buffer size of 102400, which is big enough to fit the largest
  log record. However, the minimum buffer size is 4096, which is
  even smaller than the stored procedure's 32000 byte limit. If
  the buffer size is reduced to less than half of the length of a
  log record, the started task log reader will overrun the second
  buffer.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: CDC Replication Engine                       *
  *                 for Db2 for z/OS Remote Source               *
  *                 IBM Data Replication                         *
  *                 for Db2  z/OS  Cartridge                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a log record doesn't fit into one  *
  *                      buffer, it is split into two parts.     *
  *                      The first part fills the first buffer   *
  *                      and the second part is written to the   *
  *                      next buffer. When a log record doesn't  *
  *                      fit in two buffers, the second buffer   *
  *                      is overrun.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The stored procedure log reader splits up log records to fit in
  its 32000 byte buffer. When a log record doesn't fit into one
  buffer, it is split into two parts. The first part fills the
  first buffer and the second part is written to the next buffer.
  When a log record doesn't fit in two buffers, the second
  buffer is overrun.
  

Problem conclusion

• The ability to split long log records was removed and a log
  record longer than the buffer size now fails without writing to
  the buffer. The hidden buffer size parameter was modified to
  have a minimum size of 69632 bytes.
  

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:

  UO05226

Modules/Macros

•    CECCBCFG CECCCNTL CECCDCFG CECCFGUT CECCLRDD
  CECCLRDE CECCLRDH CECCLRDI CECCLRDQ CECCLRDR CECCLRDT CECCLRD2
  CECCLRD3 CECCLRSM CECCMTO  CECCPACM CECMCFG1
  

Fix information

• Fixed component name

  CLASSIC FED & E

• Fixed component ID

  5697I8200

Applicable component levels

• RB30 PSY UO05226

     UP25/10/08 P F510

Fix is available

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