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最新的 CCAH CCA-470 免費考試真題:

1. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 100TB
B) Approximately 25TB
C) Approximately 33 TB
D) Approximately 10TB

2. What does CDH packaging do on install to facilitate Kerberos security setup?

A) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
B) Creates directories for temp, hdfs, and mapreduce with correct permissions.
C) Creates users for hdfs and mapreduce to facilitate role assignment.
D) Creates a set of pre-configured Kerberos keytab files and their permissions.
E) Creates and configures you kdc with default cluster values.

3. For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A) In HDFS, in the directory of the user who generates the job.
B) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
C) On the local disk of the slave node running the task.
D) Cached on the local disk of the slave node running the task, then copied into HDFS.

4. Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)

A) Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.
B) Rack location is considered in the HDFS block placement policy.
C) Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.
D) HDFS is rack aware but MapReduce daemons are not.
E) Even for small clusters on a single rack, configuring rack awareness will improve performance.

5. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A) To help HDFS deliver consistent performance under heavy loads.
B) To improve data locality for MapReduce tasks.
C) To ensure that all blocks in the cluster are 128MB in size.
D) To ensure that there is consistent disk utilization across the DataNodes.
E) To ensure that there is capacity in HDTS for additional data.

問題與答案：