Name the files which are used by the startup and shutdown commands?
What is Mapper in Hadoop?
Explain Erasure Coding in Hadoop?
How often DataNode send heartbeat to NameNode in Hadoop?
How to debug Hadoop code?
What do you think about the speculative execution?
What is the job tracker role in hadoop?
Why do the nodes are removed and added frequently in a hadoop cluster?
Give a brief overview of Hadoop history?
What is the role of the namenode?
Define a udf?
Explain what is webdav in hadoop?
What are some of the characteristics of Hadoop framework?