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ARROW-359: Document ARROW_LIBHDFS_DIR #196

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ARROW-359: Document ARROW_LIBHDFS_DIR #196

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10 changes: 6 additions & 4 deletions cpp/doc/HDFS.md
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Expand Up @@ -33,16 +33,18 @@ interface to the Java Hadoop client. This library is loaded **at runtime**
(rather than at link / library load time, since the library may not be in your
LD_LIBRARY_PATH), and relies on some environment variables.

* `HADOOP_HOME`: the root of your installed Hadoop distribution. Check in the
`lib/native` directory to look for `libhdfs.so` if you have any questions
about which directory you're after.
* `JAVA_HOME`: the location of your Java SDK installation
* `HADOOP_HOME`: the root of your installed Hadoop distribution. Often has
`lib/native/libhdfs.so`.
* `JAVA_HOME`: the location of your Java SDK installation.
* `CLASSPATH`: must contain the Hadoop jars. You can set these using:

```shell
export CLASSPATH=`$HADOOP_HOME/bin/hadoop classpath --glob`
```

* `ARROW_LIBHDFS_DIR` (optional): explicit location of `libhdfs.so` if it is
installed somewhere other than `$HADOOP_HOME/lib/native`.

### Mac Specifics

The installed location of Java on OS X can vary, however the following snippet
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