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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:
1. Once a client application validates its identity and is granted access to file in a cluster. What is the reminder of read path back to the client?
A) The namenode maps the read request against the block locations in it's stored metadata the block id's are stored by their distance to the client and moved to the datanode closest to the client according to hadoop rac topology. The client application then reads the blocks from the single datanode
B) The namenode gives the client the block ID's and a list of Datanodes on which those blocks are found. And the application reads the block directly from the datanodes
C) the namenode maps the read request against the block locations in its stored metadata and reads those blocks from the datanodes. The client applications then read the block from the namenode
2. What is the best disk configuration for slave nodes in hadoop cluster where each node has 6x2TB drives?
A) Six separate volumes
B) A RAID 5 array
C) A single Linux LVM (Logical volume Manager) volume
D) Three RAID 1 arrays
3. What does CDH packaging do on install to facilitate Kerberos security setup?
A) Creates and configures you kdc with default cluster values.
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 users for hdfs and mapreduce to facilitate role assignment.
4. You have a cluster running with the fair scheduler enabled and configured. You submit multiple jobs to the cluster. Each job is assigned to a pool. What are the two key points to remember about how jobs are scheduled with the fair scheduler?
A) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints)
B) Each pools share of task slots may change throughout the course of job execution
C) Each pools share of the tasks slots remains static within the execution of any individual job
D) Each pool gets 1/N of the total available tasks slots, where N is the no of jobs running on the cluster
E) Pools are assigned priorites.pools with higher priorities an executed b4 pools with lower priorities
F) Each pool gets 1/M of the total available tasks slots, where M is the no. of nodes in the cluster
5. Which three file actions can execute as you write a file into HDFS?
A) You can update the files contents
B) You can rename the file
C) You can move the file
D) You can delete the file
E) You can index the file
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: E | Question # 4 Answer: A,B | Question # 5 Answer: B,C,D |
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