Month: June 2015

Sqoop – How to import data in HDFS

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Sqoop is a tool to transfer data between Hadoop and relational databases. It uses MapReduce to import and export the data, which provides parallel operation as well as fault tolerance. Basic syntax to run Sqoop is :sqoop tool-name [Generic-Args] [Tool-arguments] All Generic arguments should precede any tool arguments. All Generic Hadoop arguments are preceded by a … Read more

Sqoop – Handle NULL values

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By default Sqoop import NULL as null, if you want to change this default configuration you can use following arguments. While importing data :  –null-string –null-non-string While exporting data :  –input-null-string –input-null-non-string Check this example for more clarification :  In above example : –null-string argument represents what should be writtern in HDFS whenever a NULL is identified in … Read more