Free Cloudera CCA-500 Exam Dumps Questions & Answers

Your Hadoop cluster is configuring with HDFS and MapReduce version 2 (MRv2) on YARN. Can you configure a worker
node to run a NodeManager daemon but not a DataNode daemon and still have a functional cluster?

• A.  Yes. The daemon will receive Reducer tasks only
• B.  Yes. The daemon will receive Map tasks only
• C.  Yes. The daemon will get data from another (non-local) DataNode to run Map tasks
• D.  Yes. The daemon will receive data from the NameNode to run Map tasks

Which YARN daemon or service negotiations map and reduce Containers from the Scheduler, tracking their status and
monitoring progress?

• A.  ApplicationManager
• B.  NodeManager
• C.  ApplicationMaster
• D.  ResourceManager

You have installed a cluster HDFS and MapReduce version 2 (MRv2) on YARN. You have no dfs.hosts entry(ies) in your hdfs-site.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 sorting HDFS blocks?

• A.  Creating a dfs.hosts file on the NameNode, add the worker Node's name to it, then issue the command hadoop dfsadmin -refresh Nodes = on the Namenode
• B.  Without creating a dfs.hosts file or making any entries, run the commands hadoop.dfsadminrefreshModes on the NameNode
• C.  Nothing; the worker node will automatically join the cluster when NameNode daemon is started
• D.  Restart the NameNode

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in the filesystem, giving the
NameNode a persistent checkpoint of the filesystem metadata?

• A.  VERSION
• B.  Fsimage_N (where N reflects transactions up to transaction ID N)
• C.  fstime
• D.  Edits_N-M (where N-M transactions between transaction ID N and transaction ID N)

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 a Hadoop cluster with seven DataNodes and on of your monitoring UIs displays the details shown in the
exhibit.
What does the this tell you?

• A.  Your cluster has lost all HDFS data which had bocks stored on the dead DatNode
• B.  The DataNode JVM on one host is not active
• C.  The HDFS cluster is in safe mode
• D.  Because your under-replicated blocks count matches the Live Nodes, one node is dead, and your DFS Used %
  equals 0%, you can't be certain that your cluster has all the data you've written it.