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Which of the following is a more compact binary format?

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Which of the following is a more compact binary format?

(a) TCompactProtocol

(b) TDenseProtocol

(c) TBinaryProtocol

(d) TSimpleJSONProtocol

This question was addressed to me during an online interview.

Enquiry is from Thrift with Hadoop topic in chapter Apache Spark, Flume, Lucene, Hama, HCatalog, Mahout, Drill, Crunch and Thrift of Hadoop

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Best answer
Right answer is (a) TCompactProtocol

To elaborate: TCompactProtocol is typically more efficient to process as well.

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