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From "Yesha Vora (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-4101) RM should print alert messages if Zookeeper and Resourcemanager gets connection issue
Date Tue, 01 Sep 2015 17:38:46 GMT
Yesha Vora created YARN-4101:
--------------------------------

             Summary: RM should print alert messages if Zookeeper and Resourcemanager gets
connection issue
                 Key: YARN-4101
                 URL: https://issues.apache.org/jira/browse/YARN-4101
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
            Reporter: Yesha Vora
            Priority: Critical


Currently, There is no way for user to understand Zk-RM has connection issues. In HA environment,
RM is highly dependent on Zookeeper. If connection between RM and Zk is jeopardized, cluster
is likely to be gone in bad state.

Example: Rm1 is active and Rm2 is standby. If connection between Rm2 and Zk is lost, Rm2 will
never become active. In this case, if Rm1 hits an error and could not be started, cluster
goes in bad state. This situation is very hard to debug for user. In this case, if we can
develop better prompting of messages, User could fix the Zk-RM connection issue and could
avoid getting in bad state.

Thus, We need a better way to prompt alert to user if connection between Zk -> Active RM
or Zk -> standby RM is getting bad.
Here are the suggestions.
1) Print connection lost alert in RM UI
2) Print alert messages while running any Yarn command such as yarn logs, yarn applications
etc



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