Dask and Parquet

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Micro Sciences

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Monolithic Environments

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Microservices

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Venvs for Apps

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Venvs for (some) Tasks

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Micro Environments

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Dask - Basics

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Computational Graphs

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Delayed

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dask.DataFrame

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Basic Usage

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What does not work?

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Data peeking

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Dynamic schemas

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Meta Management

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Rookie Mistakes

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Avoid compute!

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Avoid repartition!

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Executive Summary

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Split, Apply, Combine

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A Result in Pieces

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Computational Graphs

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Matrix

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Why??

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Scalability

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Symbolism

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Smart Speed

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Data Containers

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Row and Column Stores

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2D

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Row Storage

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Column Storage

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Partitions

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Row Storage

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Columnar Storage

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Key-Value Stores

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Parquet

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Apache Parquet

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Dataframes & Parquet

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Statistics

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Apache Arrow

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The Players

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Parquet

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Arrow

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Feather

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Column stats

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In each partfile

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Explicit Metadata

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Predicate Pushdown

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A Tale of Two (Parquet) Engines

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Fastparquet

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Pyarrow

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Dask - Partitioning

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Predicates

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Parquet Filters

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The Index

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Dask DataFrames as Key/Value Stores

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Indexed DataFrames

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Pandas

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Surrogate Index

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Partition Structures

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Implicit

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Explicit

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Partitions

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Case Study - Fancy Indexing

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A Dask Example

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The Problem

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The (Ideal) Solution

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Space Filling Curves

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Cells

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The Index

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Examples

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Coverings

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Shapes to Slices

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Convolutions

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The Point

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Dask and Luigi

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Targets

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Readings

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Dask

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Parquet

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