After enabling Kerberos on the cluster(upgraded to HDP 2.5), everything was working fine. Then I installed Zeppelin, which asked me to restart few components.
After the restart, both the resourcemanagers are not starting up.
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.io.tmpdir=/var/lib/ambari-agent/tmp/hadoop_java_io_tmpdir
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:java.compiler=<NA>
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.name=Linux
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.arch=amd64
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:os.version=2.6.32-504.8.1.el6.x86_64
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.name=yarn
2016-12-15 10:15:08,735 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.home=/home/yarn
2016-12-15 10:15:08,736 INFO zookeeper.ZooKeeper (Environment.java:logEnv(100)) - Client environment:user.dir=/usr/hdp/2.5.0.0-1245/hadoop-yarn
2016-12-15 10:15:08,736 INFO zookeeper.ZooKeeper (ZooKeeper.java:<init>(438)) - Initiating client connection, connectString=xxx.com:2181,yyy.com
:2181,zzz.com:2181 sessionTimeout=10000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@62ef27a8
2016-12-15 10:15:08,752 INFO zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(1019)) - Opening socket connection to server yyy.com/IP:2181. Will not attempt to authenticate using SASL (unknown error)
2016-12-15 10:15:08,757 INFO zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(864)) - Socket connection established to yyy.com/IP:2181, initiating session
2016-12-15 10:15:08,768 INFO zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1279)) - Session establishment complete on server yyy.com/IP:2181, sessionid = 0x3
590197ed680104, negotiated timeout = 10000
2016-12-15 10:15:08,784 INFO service.AbstractService (AbstractService.java:noteFailure(272)) - Service org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService failed in state INITED;
cause: java.io.IOException: Couldn't create /yarn-leader-election
java.io.IOException: Couldn't create /yarn-leader-election
at org.apache.hadoop.ha.ActiveStandbyElector.ensureParentZNode(ActiveStandbyElector.java:350)
at org.apache.hadoop.yarn.server.resourcemanager.EmbeddedElectorService.serviceInit(EmbeddedElectorService.java:96)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
at org.apache.hadoop.yarn.server.resourcemanager.AdminService.serviceInit(AdminService.java:152)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceInit(ResourceManager.java:281)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1228)
Caused by: org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode = NoAuth for /yarn-leader-election
at org.apache.zookeeper.KeeperException.create(KeeperException.java:113)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783)
at org.apache.hadoop.ha.ActiveStandbyElector$3.run(ActiveStandbyElector.java:1000)
at org.apache.hadoop.ha.ActiveStandbyElector$3.run(ActiveStandbyElector.java:997)
at org.apache.hadoop.ha.ActiveStandbyElector.zkDoWithRetries(ActiveStandbyElector.java:1041)
at org.apache.hadoop.ha.ActiveStandbyElector.createWithRetries(ActiveStandbyElector.java:997)
at org.apache.hadoop.ha.ActiveStandbyElector.ensureParentZNode(ActiveStandbyElector.java:344)
... 9 more
