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What are combiners? When should I use a combiner in my MapReduce Job?


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More MapReduce Interview Questions

When is the reducers are started in a MapReduce job?

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Why do we need MapReduce during Pig programming?

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Mention what is the hadoop mapreduce apis contract for a key and value class?

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How would you tackle calculating the number of unique visitors for each hour by mining a huge apache log? You can use post processing on the output of the mapreduce job.

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How to write a custom partitioner for a Hadoop MapReduce job?

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How to handle record boundaries in Text files or Sequence files in MapReduce InputSplits?

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What do sorting and shuffling do?

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What is heartbeat in hdfs? Explain.

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what are the most common input formats defined in Hadoop?

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Define the purpose of the partition function in mapreduce framework

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What is the Job interface in MapReduce framework?

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How does Hadoop Classpath plays a vital role in stopping or starting in Hadoop daemons?

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