最新のCCA-410問題集で試験を準備する

Cloudera CCA-410 試験概要:

Cloudera CCA-410 試験シラバストピック:

Cloudera Certified Administrator for Apache Hadoop CDH4 認定 CCA-410 試験問題：

1. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
B) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
C) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
D) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml

2. What happens when a map task crashes while running a mapreduce job?

A) The job immediately fails
B) The tasktracker closes the JVM instance and restarts
C) the jobtracket attempts to re-run the task on a different node
D) The jobtracker attempts to re-run the task on the same node

3. You set the value of dfs.block.size to 64MB in hdfs-site.xml on a client machine, but you set the same property to 128MB on your clusters name node. What happens when the client writes a file to HDFS?

A) A block size of 128MB will be used
B) The file will be written successfully with a block size of 64MB but client attempting to read the file will fail because the namenode believes the blocks to be 128MB in size
C) A block size of 64MB will be used
D) An execution will be thrown when the client attempts to write the file, because the values are different.

4. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be run as a MapReduce job
B) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
C) The file cannot be deleted by anyone
D) The file's contents can be modified by the owner, but no-one else
E) The file cannot be deleted by anyone but the owner

5. In the context of configuring a Hadoop cluster for HDFS High Availability (HA), 'fencing' refers to:

A) Isolating both HA NameNodes to prevent a client application from killing the NameNode daemons.
B) Isolating the standby NameNode from write access to the fsimage and edits files.
C) Isolating a failed NameNode from write access to the fsimage and edits files so that is cannot resume write operations if it recovers.
D) Isolating the cluster's master daemon to limit write access only to authorized clients.

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