State machine generates null pointer exception when it does not find component
plugin for one of the active services mentioned in cluster definition
----------------------------------------------------------------------------------------------------------------------------------------------------
Key: AMBARI-139
URL: https://issues.apache.org/jira/browse/AMBARI-139
Project: Ambari
Issue Type: Bug
Components: controller
Reporter: vitthal (Suhas) Gogate
Scenario:
1. User defines a cluster w/ a stack that has only common and hdfs components
defined in it.
2. User specifies active services as "mapred" and "hdfs", where "mapred"
component is not in the stack.
3. State machine gets null pointer when loading the component plugin for
"mapred" as one of the active services.
** this may not be the case as we may have all the components defined as part
of our default stack, but at least we have to make sure
that if user specifies some absurd name as part of active services in the
cluster definition, we should not be looking for the its component definition
and if plugin pointer is null we should not operate further on this.
public ServiceImpl(Cluster cluster, ClusterFSM clusterFsm, String serviceName)
throws IOException {
this.clusterFsm = clusterFsm;
this.serviceName = serviceName;
//load plugin and get the roles and create them
this.plugin = cluster.getComponentDefinition(serviceName); *** CHECK if
plugin is not null?? **
String[] roles = this.plugin.getActiveRoles(); ** NULL pointer exception
here for "mapred" component ***
for (String role : roles) {
RoleImpl roleImpl = new RoleImpl(this, role);
serviceRoles.add(roleImpl);
}
stateMachine = stateMachineFactory.make(this);
}
java.lang.NullPointerException
at
org.apache.ambari.resource.statemachine.ServiceImpl.<init>(ServiceImpl.java:128)
at
org.apache.ambari.resource.statemachine.ClusterImpl.<init>(ClusterImpl.java:121)
at
org.apache.ambari.resource.statemachine.StateMachineInvoker.createCluster(StateMachineInvoker.java:81)
at org.apache.ambari.controller.Clusters.addCluster(Clusters.java:498)
at org.apache.ambari.controller.Clusters.<init>(Clusters.java:139)
at org.apache.ambari.controller.Clusters.getInstance(Clusters.java:151)
at org.apache.ambari.controller.Controller.run(Controller.java:110)
at org.apache.ambari.controller.Controller.main(Controller.java:143)
2011-11-26 17:14:09.392:INFO::jetty-6.1.26
Nov 26, 2011 5:14:09 PM com.sun.jersey.api.core.PackagesResourceConfig in
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