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NEW QUESTION: 1
The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?
A. Resource Manager
B. DataNode
C. Application Manager
D. Secondary NameNode
E. NameNode
F. Node Manager
Answer: E
Explanation:
The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. It does not store the data of these files itself. There is only One NameNode process run on any hadoop cluster. NameNode runs on its own JVM process. In a typical production cluster its run on a separate machine. The NameNode is a Single Point of Failure for the HDFS Cluster. When the NameNode goes down, the file system goes offline.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers,What is a NameNode? How many instances of NameNode run on a Hadoop Cluster?
NEW QUESTION: 2
A. Option E
B. Option C
C. Option A
D. Option D
E. Option B
Answer: B,E
NEW QUESTION: 3
Your organization's security policy requires that all privileged users either use frequently rotated passwords or one-time access credentials in addition to username/password.
Which two of the following options would allow an organization to enforce this policy for AWS users? (Choose two.)
A. Configure multi-factor authentication for privileged 1AM users
B. Enable the 1AM single-use password policy option for privileged users
C. Create 1AM users for privileged accounts
D. Implement identity federation between yourorganization's Identity provider leveraging the 1AM Security Token Service
Answer: B,D
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