Answer / Neeraj Kumar Rathour

The main hdfs-site.xml properties include: dfs.namenode.name.dir (directory where the NameNode stores its data), dfs.datanode.data.dir (directory where DataNodes store their data), dfs.replication (default replication level for newly created files), dfs.blocksize (the size of a block in bytes), and dfs.namenode.secondary.http-address (HTTP address of the Secondary NameNode).

Is the hdfs block size reduced to achieve faster query results?

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If the source data gets updated every now and then, how will you synchronize the data in hdfs that is imported by sqoop?

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What is active and passive NameNode in HDFS?

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Explain the process that overwrites the replication factors in HDFS?

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Define hadoop archives? What is the command for archiving a group of files in hdfs.

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Mention what is the best way to copy files between hdfs clusters?

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Explain the difference between an hdfs block and input split?

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What is the difference betwaeen mapreduce engine and hdfs cluster?

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How to remove safemode of namenode forcefully in HDFS?

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Write command to copy a file from HDFS to linux(local).

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Does hdfs enable a customer to peruse a record, which is already opened for writing?

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How to read file in HDFS?

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