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1. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?
A) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
B) Run hadoop fs -du/and locate the DFS Remaining value.
C) Run hadoop dfsadmin -report and locate the DFS Remaining value.
D) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.
2. What does CDH packaging do on install to facilitate Kerberos security setup?
A) Creates users for hdfs and mapreduce to facilitate role assignment.
B) Creates a set of pre-configured Kerberos keytab files and their permissions.
C) Creates directories for temp, hdfs, and mapreduce with correct permissions.
D) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
E) Creates and configures you kdc with default cluster values.
3. Which two features does Kerberos security add to a Hadoop cluster?
A) User authentication on all remote procedure calls (RPcs)
B) Encryption on all remote procedure calls (RPCs)
C) Encryption for data on disk ("at rest")
D) Authentication for user access to the cluster against a central server
E) Root access to the cluster for users hdfs and mapred but non-root acess clients
4. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)
A) NameNode
B) JobTracker
C) Secondary NameNode
D) NodeManager
E) DataNode
F) TaskTracker
5. How does HDFS Federation help HDFS Scale horizontally?
A) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
B) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
C) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
Solutions:
| Question # 1 Answer: A,C | Question # 2 Answer: A | Question # 3 Answer: A,D | Question # 4 Answer: E,F | Question # 5 Answer: A |
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