The below list is the commonly asked questions in written test for Hadoop developer position. These questions are from merilytics,Hyd.
- Responsibilities of jobtracker?
- Namenode, jobtracker, tasktraker ports?
- Difference between nfs, namenode, journalnode?
- Difference between hive and hbase?
- Write custom partitioner class?
- Write the differences between sort and shuffle phase expain with examples
- What is zookeeper?
- If the output directory is already exits what will happen in hdfs?
- 64k, 65mb, 175mb size files are there how many splits will happen in hdfs?
- Write combiner for the avg value of
Mapper1 : (1950,4) (1950,7)
Mapper2: (1950 , 8)
- What is the purpose of tasktracker?
- Incremental import in sqoop?
- To list all files with blocks in hdfs which command we will use?
- Row deletion process in hbase?
- Inputformats commonly used?
- How to debug your code?
- How to add native libs in yarnjobs?
- What is serialization and deserialization..how to achieve these in hadoop?