FUNDAMENTALS OF COMPUTER

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DATABASE FUNDAMENTALS

BASICS OF BIG DATA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Consider the following statements:Statement 1:Task Tracker is hosted inside the master and it receives the job execution request from the client.Statement 2:Job tracker is the MapReduce component on the slave machine as there are multiple slave machines.
A
Only statement 1 is true
B
Only statement 2 is true
C
Both statements are true
D
Both statements are false
Explanation: 

Detailed explanation-1: -The main duties of task tracker are to break down the receive job that is big computations in small parts, allocate the partial computations that is tasks to the slave nodes monitoring the progress and report of task execution from the slave.

Detailed explanation-2: -The JobTracker submits the work to the chosen TaskTracker nodes. The TaskTracker nodes are monitored. If they do not submit heartbeat signals often enough, they are deemed to have failed and the work is scheduled on a different TaskTracker. A TaskTracker will notify the JobTracker when a task fails.

Detailed explanation-3: -Apache Hadoop YARN (Yet Another Resource Negotiator) is a cluster management technology. It is a resource-management platform responsible for managing computing resources in clusters and using them for scheduling of users’ applications. It allows Hadoop to do more than just MapReduce data processing jobs.

Detailed explanation-4: -NameNode and DataNodes An HDFS cluster consists of a single NameNode, a master server that manages the file system namespace and regulates access to files by clients. In addition, there are a number of DataNodes, usually one per node in the cluster, which manage storage attached to the nodes that they run on.

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