PH20582: SIMULTANEOUSLY WATCHING STEP OUTPUT LOG WHILE THE STEP IS RUNNING LEAKS FILE DESCRIPTORS

APAR status

• Closed as program error.

Error description

• Watching the step output log of a running step on a web agent
  leaks file descriptors. This can eventually break the agent when
  the available descriptors are exhausted.
  The custom HttpEntity used to upload the last log segment uses a
  utility method to limit the upload size to an exact length that
  returns a length limited stream that does not delegate closure
  to the underlying stream.
  
  To reproduce, create a shell process that contains an infinite
  loop that prints some text and sleeps for a time between loops
  and then watch the output log of the executing script. For
  example:
  Running lsof on the worker process will show the number of
  descriptors increase.
  

Local fix

• Do not watch running steps and/or occasionally restart the agent
  to clear leaked descriptors.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All end users on all supported browsers.                     *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Watching the step output log of a running step on a web      *
  * agent                                                        *
  * leaks file descriptors. This can eventually break the agent  *
  * when                                                         *
  * the available descriptors are exhausted.                     *
  * The custom HttpEntity used to upload the last log segment    *
  * uses a                                                       *
  * utility method to limit the upload size to an exact length   *
  * that                                                         *
  * returns a length limited stream that does not delegate       *
  * closure                                                      *
  * to the underlying stream.                                    *
  *                                                              *
  * To reproduce, create a shell process that contains an        *
  * infinite                                                     *
  * loop that prints some text and sleeps for a time between     *
  * loops                                                        *
  * and then watch the output log of the executing script. For   *
  * example:                                                     *
  * Running lsof on the worker process will show the number of   *
  * descriptors increase.                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Fixed in version 7.0.5.2                                     *
  ****************************************************************
  

Problem conclusion

• Fix is provided in IBM UrbanCode Deploy 7.0.5.2
  

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

  UC DEPLOY

• Fixed component ID

  5725M5400

Applicable component levels