Question 21 : The HDFS file system is temporarily unavailable whenever the HDFS ________ is down.
1. DataNode
2. NameNode
3. ActionNode
4. None of the mentioned
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Question 22 : _________ stores its metadata on multiple disks that typically include a non-local file server.
1. DataNode
2. NameNode
3. ActionNode
4. None of the mentioned
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Question 23 : HDFS, by default, replicates each data block _____ times on different nodes and on at least ____ racks.
1. 3,2
2. 1,2
3. 2,3
4. All of the mentioned
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Question 24 : Automatic restart and ____________ of the NameNode software to another machine is not supported.
1. failover
2. end
3. scalability
4. all of the mentioned
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Question 25 : __________ support storing a copy of data at a particular instant of time.
1. Data Image
2. Datanots
3. Snapshots
4. All of the mentioned
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Question 26 : The ____________ and the EditLog are central data structures of HDFS.
1. DsImage
2. FsImage
3. FsImages
4. All of the mentioned
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Question 27 : The ___________ machine is a single point of failure for an HDFS cluster.
1. DataNode
2. NameNode
3. ActionNode
4. All of the mentioned
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Question 28 : The HDFS client software implements __________ checking on the contents of HDFS files.
1. metastore
2. parity
3. checksum
4. none of the mentioned
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Question 29 : __________ typically compresses files to within 10% to 15% of the best available techniques.
1. LZO
2. Bzip2
3. Gzip
4. All of the mentioned
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Question 30 : Which of the following is based on the DEFLATE algorithm ?
1. LZO
2. Bzip2
3. Gzip
4. All of the mentioned
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