Jason Lowe created YARN-445:
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Summary: Ability to signal containers
Key: YARN-445
URL: https://issues.apache.org/jira/browse/YARN-445
Project: Hadoop YARN
Issue Type: New Feature
Components: nodemanager
Affects Versions: 2.0.4-beta
Reporter: Jason Lowe
It would be nice if an ApplicationMaster could send signals to contaniers such
as SIGQUIT, SIGUSR1, etc.
For example, in order to replicate the jstack-on-task-timeout feature
implemented by MAPREDUCE-1119 in Hadoop 0.21 the NodeManager needs an interface
for sending SIGQUIT to a container. For that specific feature we could
implement it as an additional field in the StopContainerRequest. However that
would not address other potential features like the ability for an AM to
trigger jstacks on arbitrary tasks *without* killing them. The latter feature
would be a very useful debugging tool for users who do not have shell access to
the nodes.
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