安裝 rJava 和 RJDBC 程式庫Install rJava and RJDBC libraries

• 03/23/2020
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本文說明如何安裝 rJAVA 和 RJBDC 程式庫。This article explains how to install rJava and RJBDC libraries.

問題Problem

當您使用筆記本資料格中的下列命令來安裝 rJAVA 和 RJDBC 程式庫時：When you install rJava and RJDBC libraries with the following command in a notebook cell:

install.packages(c("rJava", "RJDBC"))

您會發現下列錯誤：You observe the following error:

ERROR: configuration failed for package 'rJava'

原因Cause

RJAVA 和 RJDBC 套件會檢查 Azure Databricks R 目錄中不存在的 JAVA 相依性和檔案路徑。The rJava and RJDBC packages check for Java dependencies and file paths that are not present in the Azure Databricks R directory.

解決方法Solution

請遵循下列步驟，在執行中的叢集上安裝這些程式庫。Follow the steps below to install these libraries on running clusters.

1. 在儲存格中執行下列命令 %sh 。Run following commands in a %sh cell.

   %sh
   ls -l /usr/bin/java
   ls -l /etc/alternatives/java
   ln -s /usr/lib/jvm/java-8-openjdk-amd64 /usr/lib/jvm/default-java
   R CMD javareconf
   

2. 安裝 rJAVA 和 RJDBC 套件。Install the rJava and RJDBC packages.

   install.packages(c("rJava", "RJDBC"))
   

3. 確認已安裝 rJAVA 套件。Verify that the rJava package is installed.

   dyn.load('/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server/libjvm.so')
   library(rJava)