custom key data type in mapreduce


Creating Custom Hadoop Writable Data Type 9

If none of the built-in Hadoop Writable data types matches our requirements some times, then we can create custom Hadoop data type by implementing Writable interface or WritableComparable interface. Common Rules for creating custom Hadoop Writable Data Type A custom hadoop writable data type which needs to be used as value field in Mapreduce programs must implement Writable interface org.apache.hadoop.io.Writable. MapReduce key types should have the ability to compare against each […]


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Dharmeswaran ETL / Hadoop Developer Spark Nov 2016 September 21, 2017

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