You are configuring a server running HDFS, MapReduce version 2 (MRv2) on YARN running
Linux. How must you format underlying file system of each DataNode?
A.
They must be formatted as HDFS
B.
They must be formatted as either ext3 or ext4
C.
They may be formatted in any Linux file system
D.
They must not be formatted – – HDFS will format the file system automatically
it’s C – any linux file system:
The Hadoop Distributed File System is platform independent and can function on top of any underlying file system and Operating System. Linux offers a variety of file system choices, each with caveats that have an impact on HDFS.
see http://hortonworks.com/kb/linux-file-systems-for-hdfs/
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Correct answer is C
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correct answer is C – any Linux file system
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Cannot be any linux file system, has to be B, any linux file system will include ext,ext2,ReiserFS,JFS,BtrFS,ZFS. Hadoop only supports ext2,ext3,xfs
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C is the correct answer.
Hadoop Operations:
Choosing a Filesystem
Today Hadoop primarily runs on Linux: as a result we’ll focus on common Linux
filesystems. To be sure, Hadoop can run on more exotic filesystems such as those from
commercial vendors, but this usually isn’t cost-effective. Remember that Hadoop is
designed to be not only low-cost, but also modest in its requirements on the hosts on
which it runs. By far, the most common filesystems used in production clusters are
ext3, ext4, and xfs.
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from the document of Cloudera:
Filesystem Consideration:
Cloudera recommends the ext3 and ext4 filesystems
ext4 is more commonly used on new clusters
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Correct Ans should be B.
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 the supported 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.
For more information please check this:
https://www.cloudera.com/documentation/enterprise/5-4-x/topics/install_cdh_file_system.html
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Answer is B
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B
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i think it should be B
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I have the same idea. B
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B.
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