What are the frequently asked questions on Hadoop security

#What are the frequently asked questions on Hadoop security:

1. How does Hadoop security work?
2. How do you enforce access control to your data?
3. How can you control who is authorized to access, modify, and stop Hadoop MapReduce jobs?
4. How do you get your (insert application here) to integrate with Hadoop security controls?
5. How do you enforce authentication for users on all types of Hadoop clients (for example, web consoles and processes)?
6. How can you ensure that rogue services don't impersonate real services (for example, rogue TaskTrackers and tasks, unauthorized processes presenting block IDs to DataNodes to get access to data blocks, and so on)?
7. Can you tie in your organization's Lightweight Directory Access Protocol (LDAP) directory and user groups to Hadoop's permissions structure?
8. Can you encrypt data in transit in Hadoop?
9. Can your data be encrypted at rest on HDFS?
10. How can you apply consistent security controls to your Hadoop cluster?
11. What are the best practices for security in Hadoop today?
12. Are there proposed changes to Hadoop's security model? What are they?