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Heap usage during IndexWriter merging is also much lower with the new _________

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Heap usage during IndexWriter merging is also much lower with the new _________

(a) LucCodec

(b) Lucene50Codec

(c) Lucene20Cod

(d) All of the mentioned

This question was addressed to me during a job interview.

My question is from Lucene with Hadoop in section Apache Spark, Flume, Lucene, Hama, HCatalog, Mahout, Drill, Crunch and Thrift of Hadoop

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Correct answer is (b) Lucene50Codec

For explanation: Doc values and norms for the segments being merged are no longer fully loaded into heap for all fields

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