RxComputeContext: RevoScaleR Compute Contexts: Class Generator

Artikkel
07/12/2022

Description

This is the main generator for RxComputeContext S4 classes.

Usage

    RxComputeContext( computeContext, ...)

Arguments

`computeContext`

character string specifying class name or description of the specific class to instantiate, or an existing RxComputeContext object. Choices include: "RxLocalSeq" or "local", "RxLocalParallel" or "localpar", "RxSpark" or "spark", "RxHadoopMR" or "hadoopmr", "RxInSqlServer" or "sqlserver", and "RxForeachDoPar" or "dopar".

`...`

any other arguments are passed to the class generator determined from context.

Details

This is a wrapper to specific class generator functions for the RevoScaleR compute context classes. For example, the RxInSqlServer class uses function RxInSqlServer as a generator. Therefore either RxInSqlServer(...) or RxComputeContext("RxInSqlServer", ...) will create an RxInSqlServer instance.

Value

A type of RxComputeContext compute context object. This object may be used to in rxSetComputeContext or rxOptions to set the compute context.

Author(s)

Microsoft Corporation Microsoft Technical Support

Examples


 # Setup to run analyses on a SQL Server
 ## Not run:


# Note: for improved security, read connection string from a file, such as
# connectionString <- readLines("connectionString.txt")

connectionString <- "Server=MyServer;Database=MyDatabase;UID=MyUser;PWD=MyPassword"
sqlQuery <- "WITH nb AS (SELECT 0 AS n UNION ALL SELECT n+1 FROM nb where n < 9) SELECT n1.n+10*n2.n+100*n3.n+1 AS n, ABS(CHECKSUM(NewId())) 

myServer <- RxComputeContext("RxInSqlServer",
       sqlQuery = sqlQuery, connectionString = connectionString)                 
rxSetComputeContext(computeContext = myServer )
## End(Not run)

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