Can multiple clients write into an HDFS file concurrently?

65

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Why is block size set to 128 MB in Hadoop HDFS?

94

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Does HDFS allow a client to read a file which is already opened for writing?

41

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How HDFS client divide the file into the block while storing inside HDFS?

64

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What is the difference between Input Split and an HDFS Block?

72

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What is NameNode and DataNode in HDFS?

49

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Why HDFS stores data using commodity hardware despite the higher chance of failures?

40

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What are file permissions in HDFS and how HDFS check permissions for files or directory?

36

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How data or file is written into HDFS?

50

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What is throughput? How does HDFS get a good throughput?

48

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What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

45

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List the various HDFS daemons in HDFS cluster?

35

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What is the difference between NAS and HDFS?

75

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If data is present in HDFS and RF is defined, then how can we change Replication Factor?

32

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What do you mean by metadata in HDFS? Where is it stored in Hadoop?

88

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