AMBARI-5624. Usability: Check for JDK is installed on hosts as part of host checks.(vbrodetskyi)

ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariManagementControllerImpl.java

@@ -1313,7 +1313,6 @@ public class AmbariManagementControllerImpl implements AmbariManagementControlle
       for (ServiceOsSpecific osSpecific : foundedOSSpecifics) {
         hostOs.addPackages(osSpecific.getPackages());
       }
-      serviceInfo.getOsSpecifics().get(osFamily);
       // Choose repo that is relevant for host
       ServiceOsSpecific.Repo serviceRepo = hostOs.getRepo();
       if (serviceRepo != null) {

ambari-server/src/main/resources/custom_action_definitions/system_action_definitions.xml

@@ -49,4 +49,14 @@
     <description>Check umask</description>
     <targetType>ANY</targetType>
   </actionDefinition>
+  <actionDefinition>
+    <actionName>check_host</actionName>
+    <actionType>SYSTEM</actionType>
+    <inputs>threshold</inputs>
+    <targetService></targetService>
+    <targetComponent></targetComponent>
+    <defaultTimeout>60</defaultTimeout>
+    <description>General check for host</description>
+    <targetType>ANY</targetType>
+  </actionDefinition>
 </actionDefinitions>

ambari-server/src/main/resources/custom_actions/check_host.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python
+"""
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Ambari Agent
+
+"""
+
+import os, sys
+from resource_management import *
+
+
+class CheckHost(Script):
+  def actionexecute(self, env):
+    config = Script.get_config()
+
+    java_home = config['hostLevelParams']['java_home']
+
+    if not os.path.isfile(os.path.join(java_home, "bin", "java")):
+      print "Java home not exists"
+      sys.exit(1)
+
+    print "Java home exists"
+    structured_output_example = {
+        'result': 'Host check completed.'
+    }
+
+    self.put_structured_out(structured_output_example)
+
+
+if __name__ == "__main__":
+  CheckHost().execute()