:original_name: mrs_03_1064.html

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Where Are the JAR Files and Environment Variables of Hadoop Stored?
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-  **hadoopstreaming.jar**: **/opt/share/hadoop-streaming-\*** (**\*** indicates the Hadoop version.)

-  JDK environment variables: **/opt/client/JDK/component_env**
-  Hadoop environment variables: **/opt/client/HDFS/component_env**
-  Hadoop client: **/opt/client/HDFS/hadoop**
