Q. How many formats of SequenceFile are present in Hadoop I/O?

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Q. Which of the following format is more compression-aggressive?

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Q. The __________ is a directory that contains two SequenceFile.

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Q. The ______ file is populated with the key and a LongWritable that contains the starting byte position of the record.

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Q. The _________ as just the value field append(value) and the key is a LongWritable that contains the record number, count + 1.

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Q. ____________ data file takes is based on avro serialization framework which was primarily created for hadoop.

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Q. The _________ codec from Google provides modest compression ratios.

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Q. Which of the following compression is similar to Snappy compression?

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Q. Which of the following supports splittable compression?

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Q. Which of the following is the slowest compression technique?

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Q. Gzip (short for GNU zip) generates compressed files that have a _________ extension.

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Q. Which of the following is based on the DEFLATE algorithm?

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Q. __________ typically compresses files to within 10% to 15% of the best available techniques.

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Q. The LZO compression format is composed of approximately __________ blocks of compressed data.

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Q. The HDFS client software implements __________ checking on the contents of HDFS files.

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Q. The ___________ machine is a single point of failure for an HDFS cluster.

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Q. The ____________ and the EditLog are central data structures of HDFS.

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Q. __________ support storing a copy of data at a particular instant of time.

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Q. Automatic restart and ____________ of the NameNode software to another machine is not supported.

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Q. HDFS, by default, replicates each data block _____ times on different nodes and on at least ____ racks.

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