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All about BigData - Hadoop. How to get the total count of rows in a HDFS file using PIG Script. To get the total number of rows in a hdfs file we have to do the following. Load the data to HDFS. A = Load '/usecase2/BX-Users.csv' using PigStorage (';') as. Userid : chararray,location:chararray,age:chararray);. We need to group all the elements. Group All = GROUP A ALL;. Have a look at how the data is grouped into. Describe Group All;. Once we grouped , then we can count the total elements in that group.

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All about BigData - Hadoop. How to get the total count of rows in a HDFS file using PIG Script. To get the total number of rows in a hdfs file we have to do the following. Load the data to HDFS. A = Load '/usecase2/BX-Users.csv' using PigStorage (';') as. Userid : chararray,location:chararray,age:chararray);. We need to group all the elements. Group All = GROUP A ALL;. Have a look at how the data is grouped into. Describe Group All;. Once we grouped , then we can count the total elements in that group.

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All about BigData - Hadoop. How to get the total count of rows in a HDFS file using PIG Script. To get the total number of rows in a hdfs file we have to do the following. Load the data to HDFS. A = Load '/usecase2/BX-Users.csv' using PigStorage (';') as. Userid : chararray,location:chararray,age:chararray);. We need to group all the elements. Group All = GROUP A ALL;. Have a look at how the data is grouped into. Describe Group All;. Once we grouped , then we can count the total elements in that group.

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WikiHadoop: What is Class InputFormat ?

http://www.wikihadoop.com/2015/02/what-is-class-inputformat.html

All about BigData - Hadoop. What is Class InputFormat? For a Map-Reduce job. The Map-Reduce framework relies on the InputFormat of the job to:. Validate the input-specification of the job. Split-up the input file(s) into logical InputSplits, each of which is then assigned to an individual Mapper. Provide the RecordReader implementation to be used to glean input records from the logical InputSplit for processing by the Mapper. What is Class InputFormat? What is Class InputSplit? What is Class Mapper?

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WikiHadoop: February 2014

http://www.wikihadoop.com/2014_02_01_archive.html

All about BigData - Hadoop. What is Hive - A Quick intro. Hive can be explained as a data warehousing package which in on the top of Hadoop. Hive is a SQL like language used for data analysis. Hive is also called a HiveQL. Hive is used for query structured data. Hive abstracts the complexity involved in hadoop. Hive can communicate to hadoop through. Shell - for interactive queries. Driver - fetch , execute etc. Metastore - for having schema information. Executing engine : Mapreduce,HDFS. 11112,bbb2,12/1...

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WikiHadoop: February 2015

http://www.wikihadoop.com/2015_02_01_archive.html

All about BigData - Hadoop. What is Class InputFormat? For a Map-Reduce job. The Map-Reduce framework relies on the InputFormat of the job to:. Validate the input-specification of the job. Split-up the input file(s) into logical InputSplits, each of which is then assigned to an individual Mapper. Provide the RecordReader implementation to be used to glean input records from the logical InputSplit for processing by the Mapper. What is Class InputSplit? And is the responsibility of RecordReader. Gets info ...

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WikiHadoop: September 2013

http://www.wikihadoop.com/2013_09_01_archive.html

All about BigData - Hadoop. How to load data into PigStorage. Here I have data in my local. Now I need to load that data in to PigStorage. The rows are delimited by semicolon My test data is as follows and I it is in hdfs:/data/student. 1;110301;M;Mike;9;25;USA;88;Computer Science. 2;110302;M;Barry;10;24;Canada;77;History. 3;110303;M;Rusty;9;26;USA;87.7;Computer Science. 4;110304;F;Elaine;10;27;Canada;67;Biology. 5;110305;F;Natalia;9;22;India;88.6;English. 6;110306;F;Suzy;11;24;USA;98;Electronics. How to...

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WikiHadoop: September 2014

http://www.wikihadoop.com/2014_09_01_archive.html

All about BigData - Hadoop. PIG - In Join "Scalar has more than one row in the output" Resolution. When you are trying to execute PIG script with join , you are getting an error as " Backend error : Scalar has more than one row in the output. Here I am trying to join two files and retrieving specific fields. D = LOAD '/data/hos/doctor.txt' using PigStorage(',') AS (doctorid: chararray,dname: chararray);. PS = JOIN P BY disease ,S BY sdisease;. Once I run the above I will get the error as. In stead of .

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WikiHadoop

All about BigData - Hadoop. How to get the total count of rows in a HDFS file using PIG Script. To get the total number of rows in a hdfs file we have to do the following. Load the data to HDFS. A = Load '/usecase2/BX-Users.csv' using PigStorage (';') as. Userid : chararray,location:chararray,age:chararray);. We need to group all the elements. Group All = GROUP A ALL;. Have a look at how the data is grouped into. Describe Group All;. Once we grouped , then we can count the total elements in that group.

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