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What is a block and block scanner in HDFS?


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More Apache Hadoop Interview Questions

What is the difference between Gen1 and Gen2 Hadoop with regards to the Namenode?

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Explain the use of tasktracker in the hadoop cluster?

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What hadoop does in safe mode?

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How can you overwrite the replication factors in HDFS?

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Is hadoop based on google mapreduce?

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Explain the features of pseudo mode?

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How to restart Namenode?

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Mention what is the number of default partitioner in Hadoop?

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Explain the features of stand alone (local) mode?

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Whats is distributed cache in hadoop?

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What exactly is hadoop?

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How will you make changes to the default configuration files?

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