Looks like yarn.resourcemanager.store.class defaulted to org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore
Ambari should probably not set that unless there is a zookeeper_server in the cluster. Greg From: Greg <greg.h...@rackspace.com<mailto:greg.h...@rackspace.com>> Reply-To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>> Date: Wednesday, May 13, 2015 at 10:09 AM To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>> Subject: COMMERCIAL:zookeeper required for Ambari 2.0? The YARN resource manager keeps crashing in Ambari 2.0 + HDP 2.2.4.2 clusters for me. The error log indicates that it can't connect to zookeeper, which makes sense since I didn't provision zookeeper as I don't use it. I found the relevant settings in the Ambari UI: yarn.resourcemanager.zk-address = localhost:2181 yarn.resourcemanager.ha.enabled = false Since HA is disabled, why is it trying to use Zookeeper at all? Attempts to remove the zk-address setting, which was defaulted, are met with an error "This field is required". Is there some way to stop the ResourceManager from attempting to use Zookeeper? Should I open a JIRA ticket about this? Is this an Ambari issue or a YARN issue? Greg Stack trace: 2015-05-13 14:49:32,144 FATAL resourcemanager.ResourceManager (ResourceManager.java:main(1229)) - Error starting ResourceManager org.apache.hadoop.service.ServiceStateException: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /rmstore at org.apache.hadoop.service.ServiceStateException.convert(ServiceStateException.java:59) at org.apache.hadoop.service.AbstractService.start(AbstractService.java:204) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$RMActiveServices.serviceStart(ResourceManager.java:581) at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.startActiveServices(ResourceManager.java:1014) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$1.run(ResourceManager.java:1051) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$1.run(ResourceManager.java:1047) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.transitionToActive(ResourceManager.java:1047) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.serviceStart(ResourceManager.java:1091) at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193) at org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1226) Caused by: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /rmstore at org.apache.zookeeper.KeeperException.create(KeeperException.java:99) at org.apache.zookeeper.KeeperException.create(KeeperException.java:51) at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:783) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$1.run(ZKRMStateStore.java:300) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$1.run(ZKRMStateStore.java:296) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithCheck(ZKRMStateStore.java:1076) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore$ZKAction.runWithRetries(ZKRMStateStore.java:1095) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.createRootDir(ZKRMStateStore.java:296) at org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore.startInternal(ZKRMStateStore.java:279) at org.apache.hadoop.yarn.server.resourcemanager.recovery.RMStateStore.serviceStart(RMStateStore.java:478) at org.apache.hadoop.service.AbstractService.start(AbstractService.java:193) ... 12 more
