what is hadoop? How hadoop processess the data? What are mappers and reducers? What is map reduce framework? why and How to use hive and pig? difference between hive and pig? What is Speculative execution? done any Hadoop based projects? Which tools are used ? How they are used? grep coommand? Have you set any MR properties dynamically? log files? errors faced in MR job? and resolution technique linux shell scripting? linux commands? in logical questions part sum of subset problem quicksort optmizations tell me about yourself? what do you know about our company? why you want to join us?