What is a block and block scanner in HDFS?
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Define a namenode?
What is a Secondary Namenode? Is it a substitute to the Namenode?
Explain what happens in textinformat ?
what is the default replication factor in HDFS?
What is the Use of SSH in Hadoop ?
What are the important differences between apache and hadoop?
How many maximum jvm can run on a slave node?
What is Disk Balancer in Apache Hadoop?
Is a job split into maps?
What are combiners and its purpose?
What are the core components of Apache Hadoop?
What does /var/hadoop/pids do?