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最新的 CCAH CCA-410 免費考試真題:

1. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The DataNode JVM on one host is not active.
B) The HDFS cluster is in the safe mode.
C) One physical host crashed.
D) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.

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

3. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) NameNode
B) NodeManager
C) DataNode
D) JobTracker
E) ResourceManager
F) TaskTracker
G) ApplicationMaster

4. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) NodeManager
B) ApplicationMasterService
C) JobTracker
D) ResourceManager
E) TaskTracker
F) ApplicationMaster

5. Which two daemons must be installed on master nodes in hadoop cluster running mapreduce V1 (MRV1)?

A) Datanode
B) Tasktracker
C) Hmaster
D) Zookeeper
E) Namenode
F) Resourcemanager
G) ApplicationMaster

問題與答案：