gu-chi created YARN-4536:
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Summary: DelayedProcessKiller may not work under heavy workload
Key: YARN-4536
URL: https://issues.apache.org/jira/browse/YARN-4536
Project: Hadoop YARN
Issue Type: Bug
Components: nodemanager
Affects Versions: 2.7.1
Reporter: gu-chi
I am now facing with orphan process of container. Here is the scenario:
With heavy task load, the NM machine CPU usage can reach almost 100%. When some
container got event of kill, it will get {{SIGTERM}} , and then the parent
process exit, leave the container process to OS. This container process need
handle some shutdown events or some logic, but hardly can get CPU, we suppose
to see a {{SIGKILL}} as there is {{DelayedProcessKiller}} ,but the parent
process which persisted as container pid no longer exist, so the kill command
can not reach the container process. This is how orphan container process come.
The orphan process do exit after some time, but the period can be very long,
and will make the OS status worse. As I observed, the period can be several
hours
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