Jerry Cwiklik created UIMA-5310:
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Summary: UIMA-DUCC: Agent may hang in cleanup code on startup
Key: UIMA-5310
URL: https://issues.apache.org/jira/browse/UIMA-5310
Project: UIMA
Issue Type: Bug
Components: DUCC
Reporter: Jerry Cwiklik
Assignee: Jerry Cwiklik
Fix For: future-DUCC
When an agent starts up it checks if there are any cgroup containers left over
from a previous agent. This may happen if for some reason an agent fails to
stop a child process during a Ducc bounce for example. An agent tries to
cleanup such processes with kill -9 on every process associated with a
container. Once the kill is done, the code goes into a loop to verify that the
process has been killed. It checks cgroup.procs to confirm that a process is
gone. If a process is still in a container, an agent waits awhile and does a
check again. Typically a process dies and cgroups accounting is done quickly.
The agent removes a container and proceeds to run normally.
On rare occasions the ducc_ling fails to run kill -9 command and the process
persists leading to a hang.
An agent should not be blocking after the kill. If it finds a process still
running it should report this fact and continue.
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