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Big data notepad

Monday, May 9, 2016. Generating GAPLESS SEQUENCE NUMBER in map reduce. Lets say there is a large data file and using map reduce we would like to add a row number to the data. Following would be the visual representation of the approach. The following code is just representational and is not tested. Orgapache.hadoop.conf.Configuration; import. Orgapache.hadoop.fs.Path; import. Orgapache.hadoop.io.IntWritable; import. Orgapache.hadoop.io.LongWritable; import. Orgapache.hadoop.io.Text; import. IOException, ...

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Monday, May 9, 2016. Generating GAPLESS SEQUENCE NUMBER in map reduce. Lets say there is a large data file and using map reduce we would like to add a row number to the data. Following would be the visual representation of the approach. The following code is just representational and is not tested. Orgapache.hadoop.conf.Configuration; import. Orgapache.hadoop.fs.Path; import. Orgapache.hadoop.io.IntWritable; import. Orgapache.hadoop.io.LongWritable; import. Orgapache.hadoop.io.Text; import. IOException, ...

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1 big data notepad

2 sequencezkmapreduce java

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5 public static class

6 sequencemapper extends

7 intwritable constkey

8 protected void

9 setup context context { constkey

10 public void

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Big data notepad | devashis.com Reviews

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Monday, May 9, 2016. Generating GAPLESS SEQUENCE NUMBER in map reduce. Lets say there is a large data file and using map reduce we would like to add a row number to the data. Following would be the visual representation of the approach. The following code is just representational and is not tested. Orgapache.hadoop.conf.Configuration; import. Orgapache.hadoop.fs.Path; import. Orgapache.hadoop.io.IntWritable; import. Orgapache.hadoop.io.LongWritable; import. Orgapache.hadoop.io.Text; import. IOException, ...

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devashis.com

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Big data notepad: December 2015

http://www.devashis.com/2015_12_01_archive.html

Wednesday, December 30, 2015. SQL Hints - Map Joins for better performance. Thinking over this one a bit, it may make sense to build a little bit of background before jumping to map join directly. Imagine if you have to write a program (assume we are in 1990 when no big data existed) to take 2 FILES and ready them and join and then write to another file. There may be better ways, but the most common approach that comes to mind is. Key point is unless the files are sorted the join is not possible. The dis...

2

Big data notepad: Improving Performance for Hive Queries

http://www.devashis.com/2015/12/improving-performance-for-hive-queries.html

Sunday, December 27, 2015. Improving Performance for Hive Queries. If hive is used as the interface for accessing TB and PB scale data, it is quite important to optimize the queries to get them to run faster. Optimizing the queries is directly related to infrastructure, size of data, organization of data, storage formats and the data readers/ processors. This opens up thousands of possibilities in terms of how the queries can be optimized. Set hive execution engine to spark. Use Vectorization for queries.

3

Big data notepad: Hive on Spark With HDP 2.3.2

http://www.devashis.com/2015/12/hive-on-spark-with-hdp-232.html

Saturday, December 19, 2015. Hive on Spark With HDP 2.3.2. It took me a while to figure this out. Hope this guide helps others. I am using HDP 2.3.2 on windows azure but not using any windows command, so this should work on HDP 2.3.2 on any OS. Setup Maven for build. This may not be required for everybody but for me it kept giving warning that I have an older version than 3.3.3 so I decided to get a later version. Http:/ apache.arvixe.com/spark/spark-1.4.1/spark-1.4.1.tgz. Test if maven is setup correctly.

4

Big data notepad: May 2016

http://www.devashis.com/2016_05_01_archive.html

Monday, May 9, 2016. Generating GAPLESS SEQUENCE NUMBER in map reduce. Lets say there is a large data file and using map reduce we would like to add a row number to the data. Following would be the visual representation of the approach. The following code is just representational and is not tested. Orgapache.hadoop.conf.Configuration; import. Orgapache.hadoop.fs.Path; import. Orgapache.hadoop.io.IntWritable; import. Orgapache.hadoop.io.LongWritable; import. Orgapache.hadoop.io.Text; import. IOException, ...

5

Big data notepad: Hive External Tables with Multiple Character Delimiter

http://www.devashis.com/2015/12/hive-external-tables-with-multiple.html

Friday, December 25, 2015. Hive External Tables with Multiple Character Delimiter. Hive external tables allow creating external reference tables without moving the data to a new location. I created a sample dataset with delimiter " ". However I soon realized that hive external tables only allow a single character as delimiter. i.e the following code does NOT work. Orgapache.hadoop.hive.serde2.RegexSerDe'. Output.format.string" =. 1$s %2$s %3$s %4$s %5$s %6$s". Site to test my regex. Try this :https:/ git...

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Big data notepad

Monday, May 9, 2016. Generating GAPLESS SEQUENCE NUMBER in map reduce. Lets say there is a large data file and using map reduce we would like to add a row number to the data. Following would be the visual representation of the approach. The following code is just representational and is not tested. Orgapache.hadoop.conf.Configuration; import. Orgapache.hadoop.fs.Path; import. Orgapache.hadoop.io.IntWritable; import. Orgapache.hadoop.io.LongWritable; import. Orgapache.hadoop.io.Text; import. IOException, ...

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