MapReduce service components should indicate security state

The MAPREDUCE2 service components should indicate security state when queried by Ambari Agent via STATUS_COMMAND. Each component should determine it's state as follows:

HISTORYSERVER

Indicators

• Command JSON
  • config['configurations']['cluster-env']['security_enabled']
    • = “true”
• Configuration File: params.hive_client_conf_dir + ‘mapred-site.xml’
  • mapreduce.jobhistory.principal
    • not empty
    • required
  • mapreduce.jobhistory.keytab
    • not empty
    • path exists and is readable
    • required
  • mapreduce.jobhistory.webapp.spnego-principal
    • not empty
    • required
  • mapreduce.jobhistory.webapp.spnego-keytab-file
    • not empty
    • path exists and is readable
    • required

Pseudocode

if indicators imply security is on and validate
    if kinit(mapreduce.jobhistory.principal) succeeds
        state = SECURED_KERBEROS
    else
        state = ERROR 
else
    state = UNSECURED

Note: Due to the cost of calling kinit results should be cached for a period of time before retrying. This may be an issue depending on the frequency of the heartbeat timeout.