[ https://issues.apache.org/jira/browse/YARN-4101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xuan Gong reassigned YARN-4101: ------------------------------- Assignee: Xuan Gong > 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: Improvement > Components: yarn > Reporter: Yesha Vora > Assignee: Xuan Gong > 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 -- This message was sent by Atlassian JIRA (v6.3.4#6332)