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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-3737) DUCC Agent should not try to remove cgroup when kill -9 fails to stop a process
Date Thu, 10 Apr 2014 15:32:20 GMT
Jerry Cwiklik created UIMA-3737:
-----------------------------------

             Summary: DUCC Agent should not try to remove cgroup when kill -9 fails to stop
a process
                 Key: UIMA-3737
                 URL: https://issues.apache.org/jira/browse/UIMA-3737
             Project: UIMA
          Issue Type: Bug
          Components: DUCC
    Affects Versions: 1.0-Ducc
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik


When an agent starts up it tries to clean up the node. It first waits for the OR publications
and then checks the node for running processes. It then reconciles what is running against
what should be running (using OR state). Any processes not in the OR state should be evicted
with kill -9 and its cgroup removed.
If there is a defunct process on a node, it cannot be killed. Such process still has associated
cgroup which cannot be removed. Its been observed that the agent's attempt to remove the cgroup
of a defunct process causes the CPU utilization to spike for a couple of minutes.
Agent should detect if a process is defunct and not try to remove its cgroup



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