Learning Made Easy

Feeling relaxed and happy. Finally cleared Cloudera Hadoop Developer certification (CCD-410) exam today. Well exam was not that much difficult but it had some tricky question and couple of program. Here are some suggestion and link for preparing this exam. 1.Prepare Hadoop Definitive Guide.(I had referred 3rd edition of this book) 2.I read Yahoo hadoop developer tutorial. 3.Make short note's, so that it will be easy to revise at the end. 4.Try running example given in Definitive guide as well as Hadoop in Action.(Custom Record Reader,Distributed Cache,Secondary Sort , Combiner ,Partitionor etc.) 5.Play with different hadoop command's and mapper/reducer. 6.Have basic understanding of hadoop ecosystem components, specially given in definitive  guide. All the best...!!!!

Sqoop: Sqoop  is an open source tool that allows user to extract data from structured data store into  hadoop for further processing. After loading data into HDFS , it can be processed by map reduce or any other high level language like hive etc.   Data can be loaded from HDFS to relational databases for user.   By default, Sqoop will generate comma-delimited text files for imported data. Sqoop uses primary key of relational table for splitting. Each split will be process by individual mapper.. Sqoop will run 4 mapper by default to load data into HDFS. User can change number of mapper by property  –m  <no. of mapper>