PH51470: ELAPSED TIME OF REQUEST IN THE NCSA ACCESS LOG COULD BE A NEGATIVE VALUE

APAR status

• Closed as program error.

Error description

• In the customer's WASv8.5.5.20 system, they have observed a
  negative value for %D and a dash(-) for %{R}W in the NCSA access
  log. This issue might be caused when the system machine time go
  back in time to past during the request processing. But even in
  that case, it's better to calculate an absolute processing time
  without depending on OS clock.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  *                  using HTTP access logging.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Elapsed time calculations for the HTTP  *
  *                      access log may be displayed as a        *
  *                      negative value when the OS clock goes   *
  *                      back in time.                           *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Elapsed time calculations for the HTTP access log may be
  displayed as a negative value when the OS clock goes back in
  time.
  

Problem conclusion

• Elapsed time calcuations are now calculated using methods that d
  not depend on the OS clock.
  
  The fix for this APAR is targeted for inclusion in fix pack
  8.5.5.24 and 9.0.5.16. For more information, see 'Recommended
  Updates for WebSphere Application Server':
  https://www.ibm.com/support/pages/node/715553
  

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

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels