Better exception

Author: abhishekrb19

services/src/main/java/org/apache/druid/cli/CliPeonLoadSpecHolder.java

@@ -51,7 +51,7 @@ public LookupLoadingSpec getLookupLoadingSpec()
   {
     final Task task = taskProvider.get();
     if (task == null) {
-      throw DruidException.defensive("blah");
+      throw DruidException.defensive("task is null for taskProvider[%s]?!", taskProvider);
     }
     return task.getLookupLoadingSpec();
   }
@@ -61,7 +61,7 @@ public BroadcastDatasourceLoadingSpec getBroadcastDatasourceLoadingSpec()
   {
     final Task task = taskProvider.get();
     if (task == null) {
-      throw DruidException.defensive("blah");
+      throw DruidException.defensive("task is null for taskProvider[%s]?!", taskProvider);
     }
     return task.getBroadcastDatasourceLoadingSpec();
   }

services/src/main/java/org/apache/druid/cli/CliPeonTaskHolder.java

@@ -48,7 +48,7 @@ public String getDataSource()
   {
     final Task task = taskProvider.get();
     if (task == null) {
-      throw DruidException.defensive("blah");
+      throw DruidException.defensive("task is null for taskProvider[%s]?!", taskProvider);
     }
     return task.getDataSource();
   }
@@ -58,7 +58,7 @@ public String getTaskId()
   {
     final Task task = taskProvider.get();
     if (task == null) {
-      throw DruidException.defensive("blah");
+      throw DruidException.defensive("task is null for taskProvider[%s]?!", taskProvider);
     }
     return task.getId();
   }