What is a block and block scanner in HDFS?


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More Apache Hadoop Interview Questions

Define a namenode?

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What is a Secondary Namenode? Is it a substitute to the Namenode?

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Explain what happens in textinformat ?

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what is the default replication factor in HDFS?

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What is the Use of SSH in Hadoop ?

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What are the important differences between apache and hadoop?

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How many maximum jvm can run on a slave node?

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What is Disk Balancer in Apache Hadoop?

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Is a job split into maps?

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What are combiners and its purpose?

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What are the core components of Apache Hadoop?

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What does /var/hadoop/pids do?

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