Online Access Free CCA-470 Exam Questions

Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

• A.Reducers don't write blocks into HDFS
• B.The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
• C.The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
• D.The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.

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 run as a MapReduce job
• C.The file's contents can be modified by the owner, but no-one else
• D.The file cannot be deleted by anyone but the owner
• E.The file cannot be deleted by anyone

You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

• A.Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
• B.You cannot configure a client to access both directories in the current implementation of HDFS Federation.
• C.You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
• D.Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.

You are running a Hadoop cluster with all monitoring facilities properly configured. Which scenario will go undetected?

• A.A DataNode is disconnected from the cluster.
• B.HDFS is almost full.
• C.MapReduce jobs that are causing excessive memory swaps.
• D.Map or reduce tasks that are stuck in an infinite loop.
• E.The NameNode goes down.

What additional capability does Ganglia provide to monitor a Hadoop?

• A.Ability to monitor number of files in HDFS.
• B.Ability to monitor free task slots.
• C.Ability to monitor the amount of free space on HDFS.
• D.Ability to monitor processor utilization.
• E.Ability to monitor NameNode memory usage.