Sebastian Toader created AMBARI-20270:
-----------------------------------------

             Summary: NPE thrown if downscale is performed before all hosts 
registered with cluster.
                 Key: AMBARI-20270
                 URL: https://issues.apache.org/jira/browse/AMBARI-20270
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
            Reporter: Sebastian Toader
            Assignee: Sebastian Toader
            Priority: Critical
             Fix For: 2.5.0


In case of a cluster provisioned using Blueprints if a downscale is performed 
before all hosts listed in the cluster creation template joined the server a 
NullPointerException is thrown.

{code}
27 Feb 2017 06:09:07,030 ERROR [ambari-client-thread-28] ContainerResponse:419 
- The RuntimeException could not be mapped to a response, re-throwing to the 
HTTP container
java.lang.NullPointerException
at 
org.apache.ambari.server.topology.LogicalRequest.removeHostRequestByHostName(LogicalRequest.java:346)
at 
org.apache.ambari.server.controller.internal.HostResourceProvider.processDeleteHostRequests(HostResourceProvider.java:899)
at 
org.apache.ambari.server.controller.internal.HostResourceProvider.deleteHosts(HostResourceProvider.java:865)
at 
org.apache.ambari.server.orm.AmbariJpaLocalTxnInterceptor.invoke(AmbariJpaLocalTxnInterceptor.java:128)
at 
org.apache.ambari.server.controller.internal.HostResourceProvider$4.invoke(HostResourceProvider.java:345)
at 
org.apache.ambari.server.controller.internal.HostResourceProvider$4.invoke(HostResourceProvider.java:342)
at 
org.apache.ambari.server.controller.internal.AbstractResourceProvider.invokeWithRetry(AbstractResourceProvider.java:455)
at 
org.apache.ambari.server.controller.internal.AbstractResourceProvider.modifyResources(AbstractResourceProvider.java:336)
at 
org.apache.ambari.server.controller.internal.HostResourceProvider.deleteResourcesAuthorized(HostResourceProvider.java:342)
at 
org.apache.ambari.server.controller.internal.AbstractAuthorizedResourceProvider.deleteResources(AbstractAuthorizedResourceProvider.java:335)
at 
org.apache.ambari.server.controller.internal.ClusterControllerImpl.deleteResources(ClusterControllerImpl.java:339)
at 
org.apache.ambari.server.api.services.persistence.PersistenceManagerImpl.delete(PersistenceManagerImpl.java:132)
at 
org.apache.ambari.server.api.handlers.DeleteHandler.persist(DeleteHandler.java:49)
at 
org.apache.ambari.server.api.handlers.BaseManagementHandler.handleRequest(BaseManagementHandler.java:73)
at 
org.apache.ambari.server.api.services.BaseRequest.process(BaseRequest.java:144)
at 
org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:126)
at 
org.apache.ambari.server.api.services.BaseService.handleRequest(BaseService.java:90)
at 
org.apache.ambari.server.api.services.HostService.deleteHost(HostService.java:194)
{code}



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