Hadoop - HDFS - Level 1

Hadoop file system

Hadoop Data File system

Hadoop Distributed File System

None

Copy the dataset to a different folder within the same data node

Copy the dataset outside of the folder within the Same Data Node

Copy the dataset to a different Data Node within HDFS

Password protect the dataset

Same as number of data nodes in the cluster

Same as number of name nodes, including Primary and Secondary

3

5

True

False

Super Master Node in Hadoop. Everything else runs within it.

Master Node for HDFS System

Master Node for MapReduce & HDFS both

None of the above

Node that tracks metadata about the data

Slave/Worker Node that stores actual Data

Cluster nodes that provide SQL access

Backup nodes for HDFS data storage

True

False

You don't know what a heartbeat is????

A process where only two name nodes can communicate with each other

A process that enables multiple MapReduce programs to share the same memory container

A process that enables two servers to confirm that they are alive and active

An instance of file stored on one Data node is called a Block

HDFS breaks file into exact 3 parts. Each part is called a Block

A ‘block’ is the minimum amount of data that can be read or written

A block means amount of storage pre-allocated to a folder in HDFS

Data node will crash and you will know that it was full...

Since there are multiple data nodes, there is no need to know this

Name Node contains the metadata and status information of each data nodes and it can figure out which data node is full

Hadoop has a database repository. This repository keeps track of storage threshold. Name node queries this repository to find out which data node is full and which one is not

Google

Amazon

Apple

Facebook

Apache Hue

Cloudera Manager

Ambari

Impala

A user (like you and me) who is writing the file

A program that communicates with HDFS to perform file operations

All Cloudera Applications like Cloudera manager....

All of the above

They are load balanced

There disk is located on a common shared drive that both servers can access at the same time

A disk Sync program makes sure that secondary has current information about the Primary

Secondary constantly reads Primary's RAM