20171012 found it #9 pysparkの勘所

PySpark found IT project #9

@

▸ facebook : Ryuji Tamagawa

▸ Twitter : tamagawa_ryuji

▸ FB

found IT project

▸ Twitter

11

Wes Mckinney blog

▸ http://qiita.com/tamagawa-ryuji

▸

▸

▸ Spark Hadoop

▸ PySpark

▸ Spark/Hadoop PyData

▸

▸

▸

PySpark

▸

▸ SSD

▸ CPU

▸

ParquetS3

CPU

https://www.slideshare.net/kumagi/ss-78765920/4

▸

▸

▸ groupby

▸ Spark API

Spark Hadoop

Spark Hadoop

Hadoop0.x Spark

OS

HDFS

MapReduce

OS

HDFS

Hive e.t.c.HBase

MapReduce

OSHDFS

Hive e.t.c.

HBaseMapReduce

YARN

Spark Spark Streaming, MLlib, GraphX, Spark SQL)

Impala

SQL

YARN

Spark Spark Streaming, MLlib, GraphX,

Spark SQL)

Mesos

Spark Spark Streaming, MLlib, GraphX,

Spark SQL) Spark Spark Streaming, MLlib, GraphX,

Spark SQL)

Windows

Hadoop 0.x Hadoop 1.x Hadoop 2.x + Spark

▸ Amazon EMR

▸ Microsoft Azure HDInsight

▸ Cloudera Altus

▸ Databricks Community Edition Spark

▸ PyData + Jupyter PySpark

Spark Hadoop

Hadoop Spark

mapJVM

HD

FS

reduceJVM

mapJVM

reduceJVM

f1 RDD

Executor JVM

HD

FS

f2f3

f4f5

f6f7

MapReduce Spark

RDD

Spark Hadoop

Spark

▸ Hadoop MapReduce

▸ Spark API MapReduce API

▸ Hadoop

PySpark

(Py)Spark

▸ / Spark

▸ PyData

▸ Spark

▸ Spark Hadoop

PyData

PySpark

Spark 1.2 PySpark …

(Py)Spark

PySpark

PySpark

RDD API DataFrame API

▸ RDD Resilient Distributed Dataset =

Spark Java

▸ DataFrame RDD

/ R data.frame

▸ Python RDD API DataFrame API Scala

/ Java

PySpark

DataFrame API

RDD DataFrame / Dataset

MLlib ML

GraphX GraphFrame

Spark Streaming

Structured Streaming

Worker node

PySpark

Executer JVM

Driver JVM

Executer JVM

Executer JVM

Storage

Python VM

Worker node Worker node

Python VM

Python VM

RDD API PySpark

Worker node

Executer JVM

Driver JVM

Executer JVM

Executer JVM

Storage

Python VM

Worker node Worker node

Python VM

Python VM

DataFrame API PySpark

PySpark

▸ RDD API Executer JVM Python VM

▸ DataFrame API JVM

▸ UDF Python VM

▸ UDF Scala Java

▸ Spark 2.x DataFrame

Spark PyData

Spark PyData

Spark PyData

▸ Spark

▸ Python PyData

▸

▸ Parquet

▸ Apache Arrow

Spark PyData

▸ CSV JSON

▸Parquet Spark DataFrame API

Python

fastparquet pyarrow

▸ Performance comparison of different file formats and storage engines

in the Hadoop ecosystem

▸=

Spark PyData

Parquet

https://parquet.apache.org/documentation/latest/

zip CSV

I/O

ROW BLOCKCOLUMN #0 ROW #0COLUMN #0 ROW #1

COLUMN #0 ROW #NCOLUMN #1 ROW #0COLUMN #1 ROW #1

…

…

COLUMN #1 ROW #NCOLUMN #2 ROW #0

COLUMN #2 ROW #1…

COLUMN #M ROW #N

ROW BLOCKCOLUMN #0 ROW #0COLUMN #0 ROW #1

COLUMN #0 ROW #NCOLUMN #1 ROW #0

COLUMN #1 ROW #1

…

…

COLUMN #1 ROW #NCOLUMN #2 ROW #0

COLUMN #2 ROW #1…

COLUMN #M ROW #N. . .

Spark PyData

Sparkdf = spark.read.csv(csvFilename, header=True, schema = theSchema).coalesce(20) df.write.save(filename, compression = 'snappy')

from fastparquet import write

pdf = pd.read_csv(csvFilename)

write(filename, pdf, compression='UNCOMPRESSED')

fastparquet

import pyarrow as pa

import pyarrow.parquet as pq

arrow_table = pa.Table.from_pandas(pdf)

pq.write_table(arrow_table, filename, compression = 'GZIP')

pyarrow

Spark PyData

▸ pandas CSV Spark

Spark pandas

…

▸ Spark - pandas

▸ pandas → Spark …

▸ Apache Arrow

Spark PyData

Apache Arrow

▸ Apache Arrow

▸ PyData / OSS

▸ /

https://arrow.apache.org

Spark PyData

Wes blog

▸ pandas Apache Arrow

▸ Blog

▸ PyData Blog

Wes OK

▸ Apache Arrow pandas 10

https://qiita.com/tamagawa-ryuji/items/3d8fc52406706ae0c144

PySpark

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