Define Writable data types in MapReduce?


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More MapReduce Interview Questions

Map reduce jobs take too long. What can be done to improve the performance of the cluster?

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Where the mapper's intermediate data will be stored?

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What is RecordReader in a Map Reduce?

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What is the input type/format in MapReduce by default?

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What is an input reader in reference to mapreduce?

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How does fault tolerance work in mapreduce?

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What are ‘maps’ and ‘reduces’?

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What is the need of MapReduce?

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How to overwrite an existing output file/dir during execution of Hadoop MapReduce jobs?

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What are the steps involved in MapReduce framework?

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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 submit extra files(jars,static files) for MapReduce job during runtime in Hadoop?

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