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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Q. _________ stores its metadata on multiple disks that typically include a non-local file server.

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Q. The HDFS file system is temporarily unavailable whenever the HDFS ________ is down.

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Q. Apache _______ is a serialization framework that produces data in a compact binary format.

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Q. Avro schemas describe the format of the message and are defined using ______________

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Q. The ____________ is an iterator which reads through the file and returns objects using the next() method.

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Q. The ____________ class extends and implements several Hadoop-supplied interfaces.

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Q. ____________ class accepts the values that the ModelCountMapper object has collected.

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Q. The ________ method in the ModelCountReducer class “reduces” the values the mapper collects into a derived value.

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Q. Which of the following works well with Avro?

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Q. __________ tools is used to generate proxy objects in Java to easily work with the objects.

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Q. Avro schemas are defined with _____

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Q. __________ facilitates construction of generic data-processing systems and languages.

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Q. With ______ we can store data and read it easily with various programming languages.

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Q. ________ are a way of encoding structured data in an efficient yet extensible format.

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Q. Thrift resolves possible conflicts through _________ of the field.

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