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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-3739) Add more logging to Ducc Agent
Date Fri, 11 Apr 2014 14:37:16 GMT
Jerry Cwiklik created UIMA-3739:
-----------------------------------

             Summary: Add more logging to Ducc Agent  
                 Key: UIMA-3739
                 URL: https://issues.apache.org/jira/browse/UIMA-3739
             Project: UIMA
          Issue Type: Bug
          Components: DUCC
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik
            Priority: Minor
             Fix For: 1.0-Ducc


Add additional logging to the Agent code to help diagnose why an Agent doesnt launch processes.
This is rare but it does happen. The agent receives OR state, sees a new process and begins
to launch it. The log shows that the last line logged in the launch sequence is just before
the Agent tries to check if a cgroup with a given id exists. 
When the agent is in this state no processes are spawned.There is some evidence that the problem
may be related to the OS problems. When the agent had trouble launching processes, it was
observed that running a simple  command like "rm" was taking a couple of minutes.
The agent tries to determine if a cgroup exists using File.exists(). My hypothesis is that
this call may block if the OS is in a bad state.



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