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readme, tispark: update TiSpark and enable sparkR and pyspark (#27)
* update tispark to 1.0 * add TiSparkR * upgrade tispark version to 1.0.1
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Package: TiSparkR | ||
Type: Package | ||
Title: TiSpark for R | ||
Version: 1.1 | ||
Author: PingCAP | ||
Maintainer: Novemser <novemser@gmail.com> | ||
Description: A shabby thin layer to support TiSpark in R language. | ||
License: Apache 2.0 | ||
Copyright: 2017 PingCAP, Inc. | ||
Encoding: UTF-8 | ||
LazyData: true |
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exportPattern("^[[:alpha:]]+") |
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# | ||
# Copyright 2017 PingCAP, Inc. | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# http://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
# | ||
# | ||
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# Title : TiSparkR | ||
# Objective : TiSpark entry for R | ||
# Created by: novemser | ||
# Created on: 17-11-1 | ||
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# Function:createTiContext | ||
# Create a new TiContext via the spark session passed in | ||
# | ||
# @return A new TiContext created on session | ||
# @param session A Spark Session for TiContext creation | ||
createTiContext <- function(session) { | ||
sparkR.newJObject("org.apache.spark.sql.TiContext", session) | ||
} | ||
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# Function:tidbMapDatabase | ||
# Mapping TiContext designated database to `dbName`. | ||
# | ||
# @param tiContext TiSpark context | ||
# @param dbName Database name to map | ||
# @param isPrefix Whether to use dbName As Prefix | ||
# @param loadStatistics Whether to use statistics information from TiDB | ||
tidbMapDatabase <- function(tiContext, dbName, isPrefix=FALSE, loadStatistics=TRUE) { | ||
sparkR.callJMethod(tiContext, "tidbMapDatabase", dbName, isPrefix, loadStatistics) | ||
paste("Mapping to database:", dbName) | ||
} |
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## TiSparkR | ||
TiSparkR is a thin layer built to support the R language with TiSpark. | ||
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### Usage | ||
1. Download the TiSparkR source code and build a binary package (run `R CMD build R` in TiSpark root directory). Install it to your local R library (e.g. via `R CMD INSTALL TiSparkR_1.0.0.tar.gz`) | ||
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2. Build or download TiSpark dependency jar `tispark-core-1.0-RC1-jar-with-dependencies.jar` [here](https://github.com/pingcap/tispark). | ||
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3. `cd` to your Spark home directory, and run: | ||
``` | ||
./bin/sparkR --jars /where-ever-it-is/tispark-core-${version}-jar-with-dependencies.jar | ||
``` | ||
Note that you should replace the `TiSpark` jar path with your own. | ||
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4. Use as below in your R console: | ||
```R | ||
# import tisparkR library | ||
> library(TiSparkR) | ||
# create a TiContext instance | ||
> ti <- createTiContext(spark) | ||
# Map TiContext to database:tpch_test | ||
> tidbMapDatabase(ti, "tpch_test") | ||
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# Run a sql query | ||
> customers <- sql("select * from customer") | ||
# Print schema | ||
> printSchema(customers) | ||
root | ||
|-- c_custkey: long (nullable = true) | ||
|-- c_name: string (nullable = true) | ||
|-- c_address: string (nullable = true) | ||
|-- c_nationkey: long (nullable = true) | ||
|-- c_phone: string (nullable = true) | ||
|-- c_acctbal: decimal(15,2) (nullable = true) | ||
|-- c_mktsegment: string (nullable = true) | ||
|-- c_comment: string (nullable = true) | ||
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# Run a count query | ||
> count <- sql("select count(*) from customer") | ||
# Print count result | ||
> head(count) | ||
count(1) | ||
1 150 | ||
``` |