Have you ever used Counters in Hadoop. Give us an example scenario?
What is the purpose of DataNode block scanner?
What are different types of filesystem?
What is HDFS High Availability?
Explain what if rack 2 and datanode fails?
Explain use cases where SequenceFile class can be a good fit?
Why do we need a password-less ssh in fully distributed environment?
how can we change Replication Factor?
What is Safemode in Apache Hadoop?
How is the option in Hadoop to skip the bad records?
What are the hadoop's three configuration files?
Have you ever used Counters in Hadoop. Give us an example scenario?
How can we look for the namenode in the browser?