What is a 'block' in HDFS?
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What if rack 2 and datanode fails?
What is safe mode in Hadoop?
How to enable trash/recycle bin in hadoop?
What are different types of filesystem?
What are the site-specific configuration files in Hadoop?
What is the main purpose of HDFS fsck command?
How Mapper is instantiated in a running job?
What is the Use of SSH in Hadoop ?
What does the command mapred.job.tracker do?
What is the difference between traditional RDBMS and Hadoop?
Why do we use HDFS for applications having large data sets and not when there are lot of small files?
Explain what if rack 2 and datanode fails?