Cloudera Hadoop Developer Certification(CCD-410)

I have cleared Cloudera certification in May 2015 . I would like to share how to work towards preparing yourself for the cloudera certification –

• Hadoop Definitive Guide(3rd Edition/4th Edition)
• Good Training : way2learnonline.com
• HadoopExam “Simulator” from http://www.hadoopexam.com will guide you very well
• https://developer.yahoo.com/hadoop/tutorial/
• There will be some questions from sqoop as well.Check various ways of Import/Export options.
• 1-2 questions from Hive/Pig/Flume/Oozie.
• Go Thru http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/FileSystemShell.html
• Functionality of classic map reduce and yarn daemons should be known
• Most of the questions will be Map-Reduce related and some questions will be exercises of Map-Reduce.
• Have a look at regular expressions as some questions may include regular expressions
• Check Streaming,JVM Reuse,Speculative Execution,Skipping Bad Records
• In MapReduce , have a look at following –
• MapSide Join(Replicated Join)
• Composite Join
• Reducer side join(Repartition join)
• Check Secondary sort,Inverted Index,Total Order Partitioner,NGRAM
• Use various InputFormats(SequenceFileInputFormat,TextInputFormat ,NLineInputFormat etc), various OutputFormats
• MultipleInputs
• MultipleOutputs – http://www.lichun.cc/blog/2013/11/how-to-use-hadoop-multipleoutputs/
• CustomInputFormat,RecordReader etc –
  • https://hadoopi.wordpress.com/2013/05/27/understand-recordreader-inputsplit/
• Combiner
• Custom Writable,WritableComaparable,RawComparator
• ControlledJobs
• CustomPartitioner
• MRUnit
• Do some basic exercises in MapReduce for practice
• Write MR code equivalent to queries like –
  • select field1,field2 from table
  • select distinct field1,field2 from table
  • select field1,count(*) from table group by field1
  • select field1,field2 from table order by field1,field2
  • …you can think of many more
• ALL THE BEST ….