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 –
- 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 ….
ruchisaini 