最新なCloudera CCA-410問題集（97題）、真実試験の問題を全部にカバー！

質問 1：
How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?
A. They must be formatted as either ext3 or ext4
B. They must be formatted as HDFS
C. They may be formatted in nay Linux filesystem
D. They must not be formatted - - HDFS will format the filesystem automatically
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 2：
Which two occur when individual blocks are returned to DATANODE on a cluster local filesystem?
A. A metadata file is written to the datanode containing the checksums for each block
B. A metadata file is return to the datanode containing all the other node locations in the namespace
C. The datanode writes a metadata file with the name of the file the block is associated with
D. The datanode updates it's log of checkum verification
E. The datanode runs a block scanner datablock scanner to verify the return blocks.
正解：C,E
解説: (Pass4Test メンバーにのみ表示されます)

質問 3：
In a cluster configured with HDFS High Availability (HA) but NOT HDFS federation, each map task run:
A. In the same Java Virtual Machine as the DataNode.
B. In the same Java Virtual Machine as the JobTracker.
C. In the same Java Virtual Machine as the TaskTracker
D. In its own Java Virtual Machine.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)

質問 4：
Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?
A. the client writes immediately to data nodes at random
B. The clients sends the data to the name node, which then writes those blocks to the data nodes
C. The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
D. The client immediately to data nodes based on the clusters rack locality settings
正解：C
解説: (Pass4Test メンバーにのみ表示されます)

質問 5：
You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?
A. Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
B. The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
C. The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
D. The order of execution of tasks within a job may vary.
E. Tasks are scheduled in the order of their jobs' submission.
F. Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
正解：D,E

質問 6：
How does HDFS Federation help HDFS Scale horizontally?
A. HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
B. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D. HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
正解：D
解説: (Pass4Test メンバーにのみ表示されます)

質問 7：
Which three processes does HDFS High Availability (HA) enable on your cluster?
A. Write data to two clusters simultaneously
B. Shut one NameNode down for maintenance without halting the cluster
C. Automatically 'fail over' between NameNodes if one goes down
D. Manually 'fail over' between NameNodes
E. Configure unlimited hot standby NameNode.
正解：B,C,D
解説: (Pass4Test メンバーにのみ表示されます)

質問 8：
For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?
A. There are always exactly as many task attempts as there are tasks.
B. There are always at most as many tasks attempts as there are tasks.
C. There are always at least as many task attempts as there are tasks.
D. The developer sets the number of task attempts on job submission.
正解：C