what is a datanode?
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What is Rack Awareness in Apache Hadoop?
What is high availability in hadoop?
What is HDFS block size and what did you chose in your project?
Explain the master class and the output class do?
What is Apache Hadoop YARN?
What is difference between secondary namenode, checkpoint namenode & backupnod secondary namenode, a poorly named component of hadoop?
How does NameNode tackle DataNode failures?
What does ‘jps’ command do?
how to share the metastore within multiple users?
Explain what is the purpose of RecordReader in Hadoop?
Data Engineer Given a list of followers in the format:123, 345234, 678345, 123…Where column one is the ID of the follower and column two is the ID of the followee. Find all mutual following pairs (the pair 123, 345 in the example above). How would you use Map/Reduce to solve the problem when the list does not fit in memory?
What is crontab? Explain with suitable example?
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