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How must you format the underlying filesystem of each DataNode?

You are configuring a cluster running HDFS, MapReduce version 2 (MRv2) on YARN running
Linux. How must you format the underlying filesystem of each DataNode?

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A.
They must not formatted – – HDFS will format the filesystem automatically

B.
They may be formatted in any Linux filesystem

C.
They must be formatted as HDFS

D.
They must be formatted as either ext3 or ext4

Explanation:

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4 Comments on “How must you format the underlying filesystem of each DataNode?

  1. Natarajan Ramanathan says:

    Supported Filesystems
    The Hadoop Distributed File System (HDFS) is designed to run on top of an underlying filesystem in an operating system. Cloudera recommends that you use either of the following filesystems tested on thesupported operating systems:
    ext3: This is the most tested underlying filesystem for HDFS.
    ext4: This scalable extension of ext3 is supported in more recent Linux releases.Important: Cloudera does not support in-place upgrades from ext3 to ext4. Cloudera recommends that you format disks as ext4 before using them as data directories.
    XFS: This is the default filesystem in RHEL 7.




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