IJ29465: LONG GC PAUSE DURING SCAVENGE

APAR status

• Closed as program error.

Error description

• Error Message: The verbose GC log shows GC pauses exceptionally
  long during GC scavenge.
  .
  Stack Trace: N/A
  .
  

Local fix

• This issue only happens in some corner cases when a running GC
  thread is stopped by some external factors such as CPU resource
  shortage.  The issue would disappear if the external factors are
  removed.
          The issue might disappear if the number of GC threads
  are decreased.
  

Problem summary

• The problem is caused when a GC thread is stopped, because of
  some external factors, at some critical moment when last job
  element has been removed from job list but global job counter
  has not been decremented yet so other threads still iterating in
  a search of job.
  

Problem conclusion

• The JVM has been updated that the GC thread decrements global
  job counter before job element is removed from job list
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP25  (8.0.6.25)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R270 PSY

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