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The Ultimate Cheat Sheet On Hadoop

Top 20 frequently asked questions to test your Hadoop knowledge given in the below Hadoop cheat sheet. Try finding your own answers and match the answers given here.




Question #1 

You have written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?



A. Writable
B. WritableComparable
C. InputFormat
D. OutputFormat
E. Combiner
F. Partitioner
Ans: e




Question #2 

Where is Hive metastore stored by default ?


A. In HDFS
B. In client machine in the form of a flat file.
C. In client machine in a derby database
D. In lib directory of HADOOP_HOME, and requires HADOOP_CLASSPATH to be modified.
Ans: c




Question…
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UNIX Shell Scripting and Job Scheduling

Shell scripting and job scheduling are two major tasks for any UNIX developer. I am presenting here essential commands that need for any developer.

 Shell Scripts commands
  • Shell script basics
  • Variables in shell scripts
  • Kornshell arithmetic 
  • Commands for scripts
  • Flow control, tests, and expressions
  • Making Scripts Friendlier
  • Functions
  • Pipes and Shell Scripts
  • Scripts with awk and/or sed
Job Scheduling commands
  • bg and at
  • cron
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