Answer / Deepak Goswami

File permissions in HDFS are similar to UNIX-based file systems. They determine the read, write, and execute permissions for three types of users: user (the owner), group, and others. HDFS checks permissions when a client attempts an operation on a file or directory. The permissions are defined using chmod command in Hadoop, and they are stored as a part of the file's metadata. The permission for each user is represented by a three-digit number where the first digit represents the owner, the second digit the group, and the third digit others.

How data or a file is written into hdfs?

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Define data integrity? How does hdfs ensure data integrity of data blocks stored in hdfs?

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How is indexing done in Hadoop HDFS?

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Write the command to copy a file from linux to hdfs?

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What do you mean by meta data in hdfs? List the files associated with metadata.

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What is throughput? How does hdfs provides good throughput?

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When NameNode enter in Safe Mode?

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Explain the difference between mapreduce engine and hdfs cluster?

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What is the difference between nas (network attached storage) and hdfs?

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HDFS is used for applications with large data sets, not why Many small files?

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Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

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Will various customers write into an hdfs record simultaneously?

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