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From "Robinson, Landon - Landon" <>
Subject Sequential Processing
Date Thu, 28 Apr 2016 18:59:35 GMT
Crunch Gurus,

We need to process some data in order, so parallelDo shouldn’t work for this approach. We’ve
looked at SequentialDo, but not sure how exactly to make it work…(Not much documentation
on it).
DataRecord is a java object with getters and setters.

Right now, we have a PGroupedTable<String, DataRecord> where the String keys in the
PGT are linked to multiple DataRecord objects (standard PGT behavior).
What we need to do now is loop through all records for a particular key, sort them, and do
some simple calculations.

What is the best way/standard way to process a PgroupedTable so that records corresponding
to the same key are all kept together and processed?

Right now we know how to crack open a PGT in the local code and flip through it (the SingleUseIterable),
but we need to make a new dataset out of it, not just play with it.

Any direction or guidance would be appreciated!
Landon Robinson
Big Data & Hadoop Engineer
IT Business Intelligence, Lowe’s Companies Inc.

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