[AMBARI-13019] Empty package folders on ambari-server causes corresponding component restart to fail

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.0
• Fix Version/s: 2.3.0
• Component/s: ambari-server
• Assignee: Nahappan Somasundaram
• Reporter: Nahappan Somasundaram
• Created: 04/Sep/15 20:06
• Updated: 19/Sep/15 02:56
• Resolved: 19/Sep/15 00:26

Description

When the agent executes a command say status/start/stop command, ambari-server provides the service_package_folder to use as a parameter

Repro Steps:
1. mkdir /var/lib/ambari-server/resouces/stacks/HDP/2.2/services/HDFS/package
2. ambari-server restart
3. Notice HDFS components report Heartbeat Lost and Restart HDFS fail.
4. This is because the sservice_package_folder is set to the empty folder.
ERROR 2015-08-28 20:35:59,383 CustomServiceOrchestrator.py:218 - Caught an exception while executing custom service command: <class 'ambari_agent.AgentException.AgentException'>: 'Script /var/lib/ambari-agent/cache/stacks/HDP/2.2/services/HDFS/package/scripts/namenode.py does not exist'; 'Script /var/lib/ambari-agent/cache/stacks/HDP/2.2/services/HDFS/package/scripts/namenode.py does not exist'
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/ambari_agent/CustomServiceOrchestrator.py", line 151, in runCommand
script_path = self.resolve_script_path(base_dir, script)
File "/usr/lib/python2.6/site-packages/ambari_agent/CustomServiceOrchestrator.py", line 288, in resolve_script_path
raise AgentException(message)

So even if we disable the stack from replicating an empty folder, the ambari-server would still pass the path as empty folder.

We should also look at ignoring empty package folders while building the Stack Inheritance in Ambari Server

Refer code in: ambari/ambari-server/src/main/java/org/apache/ambari/server/stack