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Hudson commented on YARN-4101: ------------------------------ FAILURE: Integrated in Hadoop-Mapreduce-trunk-Java8 #338 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk-Java8/338/]) YARN-4101. RM should print alert messages if Zookeeper and Resourcemanager gets connection issue. Contributed by Xuan Gong (jianhe: rev 09c64ba1ba8be7a2ac31f4e42efb8c99b682399f) * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/TestRMWebServices.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/EmbeddedElectorService.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/AdminService.java * hadoop-yarn-project/CHANGES.txt * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebAppFilter.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/RMWebApp.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/dao/ClusterInfo.java * hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/AboutBlock.java * hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ActiveStandbyElector.java > 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: Sub-task > Components: yarn > Reporter: Yesha Vora > Assignee: Xuan Gong > Priority: Critical > Fix For: 2.8.0, 2.7.2, 2.6.2 > > Attachments: YARN-4101.1.patch, YARN-4101.2.patch, YARN-4101.3.patch > > > 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)