[HADOOP-14212] Expose SecurityEnabled boolean field in JMX for other services besides NameNode

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.2.0, 3.1.2
• Labels: security
• Assignee: Adam Antal
• Reporter: Ray Burgemeestre
• Created: 22/Mar/17 11:28
• Updated: 02/Oct/19 17:16
• Resolved: 15/Aug/18 00:51

Description

The following commit https://github.com/apache/hadoop/commit/dc17bda4b677e30c02c2a9a053895a43e41f7a12 introduced a "SecurityEnabled" field in the JMX output for the NameNode. I believe it would be nice to add this same change to the JMX output of other services: Secondary Namenode, ResourceManager, NodeManagers, DataNodes, etc. So that it can be queried whether Security is enabled in all JMX resources.

The reason I am suggesting this feature / improvement is that I think it would provide a clean way to check whether your cluster is completely Kerberized or not. I don't think there is an easy/clean way to do this now, other than checking the logs, checking ports etc.?

The file where the change was made is hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNode.java has the following function now:

@Override // NameNodeStatusMXBean
public boolean isSecurityEnabled() {
    return UserGroupInformation.isSecurityEnabled();
}

I would be happy to develop a patch if it seems useful by others as well?

This is a snippet from the JMX output from the NameNode in case security is not enabled:

  {
    "name" : "Hadoop:service=NameNode,name=NameNodeStatus",
    "modelerType" : "org.apache.hadoop.hdfs.server.namenode.NameNode",
    "NNRole" : "NameNode",
    "HostAndPort" : "node001.cm.cluster:8020",
    "SecurityEnabled" : false,
    "LastHATransitionTime" : 0,
    "State" : "standby"
  }