CCA-500 Cloudera Certified Administrator for Apache Hadoop (CCAH) Question and Answers

Yarn application –refreshJobHistory

Yarn application –kill application_1374638600275_0109

Yarn rmadmin –refreshQueue

Yarn rmadmin –kill application_1374638600275_0109

Stored as metadata on the NameNode

Stored along with the data in HDFS

Stored in the Metadata

Stored in ZooKeeper

HMaster

ResourceManager

TaskManager

JobTracker

NameNode

DataNode

Yes. The daemon will receive data from the NameNode to run Map tasks

Yes. The daemon will get data from another (non-local) DataNode to run Map tasks

Yes. The daemon will receive Map tasks only

Yes. The daemon will receive Reducer tasks only

The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of hadoop’s speculative execution framework.

The client queries the NameNode for the locations of the block, and reads from the first location in the list it receives.

The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from any given time.

The client queries the NameNode which retrieves the block from the nearest DataNode to the client then passes that block back to the client.

SampleJar.Jar is sent to the ApplicationMaster which allocates a container for SampleJar.Jar

Sample.jar is placed in a temporary directory in HDFS

SampleJar.jar is sent directly to the ResourceManager

SampleJar.jar is serialized into an XML file which is submitted to the ApplicatoionMaster