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https://issues.apache.org/jira/browse/UIMA-5794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16513927#comment-16513927
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Jerry Cwiklik commented on UIMA-5794:
-------------------------------------
I was able to reproduce the problem. Looks like FailedInitialization in the POP
(plain old process) is exposing a bug in the agent. When initialization fails
and POP keeps running, an agent is not killing the process. After a while, the
RM decides to purge such process. An agent receives a new state from OR, finds
that its inventory has a running process which is not in the OR state.
The JP is immune to this bug since it calls System.exit() when there is an
exception during initialization. Agent's job is to cleanup processes which it
clearly fails to do for POPs.
> DUCC: Agent fails to stop processes
> -----------------------------------
>
> Key: UIMA-5794
> URL: https://issues.apache.org/jira/browse/UIMA-5794
> Project: UIMA
> Issue Type: Bug
> Components: DUCC
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
> Priority: Major
> Fix For: 2.2.3-Ducc
>
>
> Agent does not stop running processes sometimes. In a specific case, the
> agent left a few processes running even though these processes state was set
> to Stopping.
> [Process Type=Pop DUCC ID=348 PID=17099 State=Stopping Resident
> Memory=361656320 GC Total=-1 GC Time=-1 Init Stats List Size:0 Reason:
> JPHasNoActiveJob] Exit Code=0
> [Process Type=Pop DUCC ID=364 PID=593 State=Stopping Resident
> Memory=7382974464 GC Total=-1 GC Time=-1 Init Stats List Size:0 Reason:
> JPHasNoActiveJob] Exit Code=0
> For some reason Agent failed to send SIGKILL after SIGTERM failed to stop
> them. Since these processes used a lot of memory, the OS killer ended up
> killing legit processes to keep the node from running out of memory.
> Since agent logs wrapped the evidence of what happened has been lost.
> Modify agent to keep sending SIGKILL to processes in Stopping state after
> some time lapses. Perhaps rogue process detector can be tasked with that.
>
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