IJ52436: THREADS HUNG IN KEEPALIVECACHE CAUSING SYSTEM SLOWDOWN

APAR status

• Closed as program error.

Error description

• Error Message: The production system slowdown is caused by
  threads being hung in the KeepAliveCache.
  .
  Stack Trace:
  .
  

Local fix

Problem summary

• The production slowdown is caused by threads becoming stuck in
  the KeepAliveCache while waiting for the Keep-Alive-Timer to
  close connections. This prevents threads from being reused for
  new requests, leading to a backlog. As a result, system
  performance is significantly impacted, causing delays in
  processing.
  

Problem conclusion

• Avoid blocking threads by allowing the cleaner thread to handle
  socket closures after releasing the KeepAliveCache lock. This
  change improves connection management and reduces delays during
  socket closure.
  .
  This APAR will be fixed in the following Releases:
  .
  IBM Semeru Runtimes
  IBM SDK, Java Technology Edition
     8    SR8 FP40  (8.0.8.40)
  .
  Downloads and supplementary documentation can be found at the
  following locations:
  - For non z/OS operating systems:
    - IBM Semeru Runtimes, Version 11 and later
      https://www.ibm.com/semeru-runtimes/downloads/
    - IBM SDK, Java Technology Edition, Version 8
      https://www.ibm.com/support/pages/java-sdk-downloads/
  - For the z/OS operating system:
    - Java SDK Products on z/OS
      https://www.ibm.com/support/pages/java-sdk-products-zos
  

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

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels