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最新的 CCAH CCA-505 免費考試真題:

1. A user comes to you, complaining that when she attempts to submit a Hadoop job, it fails.
There is a directory in HDFS named /data/input. The Jar is named j.jar, and the driver class is named DriverClass. She runs command:
hadoop jar j.jar DriverClass /data/input/data/output
The error message returned includes the line:
PrivilegedActionException as:training (auth:SIMPLE) cause.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exits: file :/data/input
What is the cause of the error?

A) The output directory already exists
B) The name of the driver has been spelled incorrectly on the command line
C) The Hadoop configuration files on the client do not point to the cluster
D) The user is not authorized to run the job on the cluster
E) The directory name is misspelled in HDFS

2. Your cluster is configured with HDFS and MapReduce version 2 (MRv2) on YARN. What is the result when you execute: hadoop jar samplejar.jar MyClass on a client machine?

A) SampleJar.jar is sent to the ApplicationMaster which allocation a container for Sample.jar
B) SampleJar.Jar is placed in a temporary directly in HDFS
C) SampleJar.Jar is sent directly to the ResourceManager
D) SampleJar.Jar is serialized into an XML file which is submitted to the ApplicationMaster

3. You are the hadoop fs -put command to add a file "sales.txt" to HDFS. This file is small enough that it fits into a single block, which is replicated to three nodes in your cluster (with a replication factor of 3). One of the nodes holding this file (a single block) fails. How will the cluster handle the replication of this file in this situation/

A) The file will be re-replicated automatically after the NameNode determines it is under replicated based on the block reports it receives from the DataNodes
B) The file will remain under-replicated until the administrator brings that nodes back online
C) The cluster will re-replicate the file the next time the system administrator reboots the NameNode daemon (as long as the file's replication doesn't fall two)
D) This file will be immediately re-replicated and all other HDFS operations on the cluster will halt until the cluster's replication values are restored

4. You have installed a cluster running HDFS and MapReduce version 2 (MRv2) on YARN. You have no afs.hosts entry()ies in your hdfs-alte.xml configuration file. You configure a new worker node by setting fs.default.name in its configuration files to point to the NameNode on your cluster, and you start the DataNode daemon on that worker node.
What do you have to do on the cluster to allow the worker node to join, and start storing HDFS blocks?

A) Restart the NameNode
B) Create a dfs.hosts file on the NameNode, add the worker node's name to it, then issue the command hadoop dfsadmin -refreshNodes on the NameNode
C) Without creating a dfs.hosts file or making any entries, run the command hadoop dfsadmin -refreshHadoop on the NameNode
D) Nothing; the worker node will automatically join the cluster when the DataNode daemon is started.

問題與答案：

問題 #1 答案： C

問題 #2 答案： A

問題 #3 答案： D

問題 #4 答案： C