Junping Du created YARN-4602:
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Summary: Message/notification service between containers
Key: YARN-4602
URL: https://issues.apache.org/jira/browse/YARN-4602
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Junping Du
Assignee: Junping Du
Currently, mostly communications among YARN daemons, services and applications
are go through RPC. In almost all cases, logic running inside of containers are
RPC client but not server because it get launched inflight. The only special
case is AM container, because it get launched earlier than any other containers
so it can be RPC server and tell new coming containers server address in
application logic (like MR AM).
The side effects are:
1. When AM container get failed, the new AM attempts will get launched with new
address/port, so previous RPC are broken.
2. Application's requirement are variable, there could be other dependency
between containers (not AM), so some container failed over will affect other
containers' running logic.
It is better to have some message/notification mechanism between containers for
handle above cases.
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