Hadoop /Spark UI Basics

Contents :

Hue (UI)

First tab in the Hadoop/Spark window is Hue.

Hue aggregates the most common Apache Hadoop components into a single interface and targets the user experience.

Its main goal is to have the users "just use" Hadoop without worrying about the underlying complexity or using a command line. (Wikipedia)

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Documentation /Tutorials: Hue Website

Hadoop Console (CLI)

Second tab is a console that you can use to perform hadoop commands:

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All hadoop commands are invoked by the bin/hadoop script.

Running the hadoop script without any arguments prints the description for all commands.

Hadoop Commands (link)

Spark UI

Here on the Spark UI interface you can see all info about running and completed applications and processes
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Spark history

Here you can browse your application history:
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Other

HDFS Web UI

Hadoop provides Web UI (along with CLI) for HDFS and YARN Resourse Manager. Here you can see the following overview of your cluster:

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Check HDFS Web UI tutorial here

Resource Manager (YARN)

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Read more about YARN on Apache Hadoop Website