What is the best hardware configuration to run Hadoop?
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What is HDFS Block size? How is it different from traditional file system block size?
Input Split & Record Reader and what they do?
How to enable trash/recycle bin in hadoop?
What do sorting do?
What does the command mapred.job.tracker do?
What is the default replication factor?
How to use Apache Zookeeper command line interface?
What is the difference between traditional RDBMS and Hadoop?
What are the problems with Hadoop 1.0?
How can you overwrite the replication factors in HDFS?
How the Client communicates with HDFS?
How did you debug your Hadoop code ?