CCA-410 試験問題を無料オンラインアクセス

You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

• A.The file successfully writes to /users/reports/myreports/myreport.txt.
• B.The client throws an exception.
• C.The file writes fails silently; no file is written, no error is reported.
• D.The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.

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

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

What are the permissions of a file in HDFS with the following:rw-rw-r-x?

• A.the owner and group can modify the contents of the file other can't
• B.the owner and group cannot delete the file, but other can
• C.HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
• D.No one can modify the content of the file
• E.the owner and group can read the file other can't

Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?

• A.The option to change java maximum heap sizes for the other role instances
• B.the option to specify an alternate slave host to place the received data node role instance
• C.the option to immediately rebalance the cluster
• D.The option to failover to the instance by namenode

What four functions do scheduling algorithms perform on hadoop cluster?

• A.support the implementation of service-level agreements for multiple cluster users
• B.allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
• C.Reduce the job latencies in environment with multiple jobs of different sizes
• D.Run jobs at periodic times of the day
• E.Reduce the total amount of computation necessary to complete a job.
• F.Ensure data locality by ordering map tasks so that they run on data local maps slots
• G.Allow multiple users to share clusters in a predictable policy-guided manner