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

25GB on each hard drive may not be used to store HDFS blocks

100GB on each hard drive may not be used to store HDFS blocks

All hard drives may be used to store HDFS blocks as long as at least 100 GB in total is available on the node

A maximum if 100 GB on each hard drive may be used to store HDFS blocks

The write succeeds, overwriting foo.txt in HDFS with no warning

The file is uploaded and stored as a plain file named input

You get a warning that foo.txt is being overwritten

You get an error message telling you that foo.txt already exists, and asking you if you would like to overwrite it.

You get a error message telling you that foo.txt already exists. The file is not written to HDFS

You get an error message telling you that input is not a directory

The write silently fails

ApplicationMaster

NodeManager

ApplicationManagerService

ResourceManager

Because there is a more than a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time

Tasks are scheduled on the order of their job submission

The order of execution of job may vary

Given job A and submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B

The FIFO Scheduler will give, on average, and equal share of the cluster resources over the job lifecycle

The FIFO Scheduler will pass an exception back to the client when Job B is submitted, since all slots on the cluster are use

Oozie

ZooKeeper

HBase

Sqoop

HUE

Sample the web server logs web servers and copy them into HDFS using curl

Ingest the server web logs into HDFS using Flume

Channel these clickstreams into Hadoop using Hadoop Streaming

Import all user clicks from your OLTP databases into Hadoop using Sqoop

Write a MapReeeduce job with the web servers for mappers and the Hadoop cluster nodes for reducers