Un-Answered Questions { Software }

What is Reducer in Hadoop?

248


What are the most common InputFormats in Hadoop?

296


Explain InputSplit in Hadoop?

233


What is the purpose of RecordReader in hadoop?

227


What is Combiner in Hadoop?

249


If no custom partitioner is defined in Hadoop then how is data partitioned before it is sent to the reducer?

236


Why aggregation cannot be done in Mapper?

300


Explain map-only job?

272


What is KeyValueTextInputFormat in Hadoop?

262


What happen if number of reducer is set to 0 in Hadoop?

239


What is TextInputFormat in Hadoop?

231


What is purpose of RecordWriter in Hadoop?

283


What are the most common OutputFormat in Hadoop?

296


What is LazyOutputFormat in Hadoop?

266


What is Identity reducer?

231