IJ34905: LONG DELAY IN ATTACHAPI

APAR status

• Closed as program error.

Error description

• When using AttachAPI on multiple JVMs at same time there is an
  observed long delay or pause
  .
  stack Trace:
  OverlappingFileLockException might occur after the long delay or
  pause
  
  Cause of exception is
  java.nio.channels.OverlappingFileLockException:
  sun.nio.ch.SharedFileLockTable.checkList(FileLockTable.java)
  sun.nio.ch.SharedFileLockTable.add(FileLockTable.java)
  sun.nio.ch.FileChannelImpl.lock(FileChannelImpl.java)
  java.nio.channels.FileChannel.lock(FileChannel.java)
  openj9.internal.tools.attach.target.FileLock.lockFile(FileLock.j
  ava)
  openj9.internal.tools.attach.target.CommonDirectory.obtainAttach
  Lock(CommonDirectory.java)
  com.ibm.tools.attach.attacher.OpenJ9VirtualMachine.tryAttachTarg
  et(OpenJ9VirtualMachine.java)
  

Local fix

Problem summary

• The problem is caused when AttachAPI is used simultaneously on
  multiple JVM's waiting for lock objects
  

Problem conclusion

• The JVM has been updated to reduce the long delays by properly
  handling exceptions and reducing timeout for error recovery.
  
  PR: https://github.com/eclipse-openj9/openj9/pull/13140
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP36  (8.0.6.36)
  .
  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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