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Pyramid operation preserves partitioning #2311

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merged 2 commits into from Aug 5, 2017

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echeipesh commented Aug 4, 2017

The main objective of this PR is to ensure that pyramid operation provides Partitioner if one is provided. This was not the case because final operation performed an RDD.map.

The related refactor is to merge pixels into target pyramid tile in the combine functions, rather than accumulating them in a list. This will any tiles that share a source partition will be resampled and merged on the map side, possibly reducing the shuffle volume.

echeipesh added some commits Aug 4, 2017

Merge pyramid tiles during combine step
Signed-off-by: Eugene Cheipesh <echeipesh@gmail.com>

@lossyrob lossyrob merged commit 0f4fda2 into locationtech:master Aug 5, 2017

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