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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…

6 Top IT Skills that have Huge demand for the next 5 Years

These are top IT skills you need to know. Also, these are highly employable skills. These you can say as digital skills. Digital skills fetch you best salary, according to surveys by top job portals.
top it skills useful to know

6 Top IT SKills

  1. SAS and R Programming
  2. Full stack development
  3. Data Engineering
  4. Data Scinece
  5. Mobile development - Perl, Ruby and Python
  6. Middleware integration software.

The Bottom Line

  • The trend is now changed. You can attend off-line and On-line courses and you can practices daily two hours.
  • Within 2 or 3 months you can be perfect.
  • Select any one skill for your employability.
  • You cannot learn all the skills. It is dofficult to tell answers in the interviews.

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