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During merging, __________ now always checks the incoming segments for corruption before merging.

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During merging, __________ now always checks the incoming segments for corruption before merging.

(a) LocalWriter

(b) IndexWriter

(c) ReadWriter

(d) All of the mentioned

The question was asked in my homework.

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

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The correct answer is (b) IndexWriter

The explanation: Lucene supports random-writable and advance-able sparse bitsets.

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