[jira] [Created] (ARROW-13141) [C++][Python] HadoopFileSystem: automatically set CLASSPATH based on HADOOP_HOME env variable?

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-13141:
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             Summary: [C++][Python] HadoopFileSystem: automatically set CLASSPATH based on HADOOP_HOME env variable?
                 Key: ARROW-13141
                 URL: https://issues.apache.org/jira/browse/ARROW-13141
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++, Python
            Reporter: Joris Van den Bossche


I the "legacy" HadoopFileSystem implementation, we have a {{_maybe_set_hadoop_classpath}} function which has some logic to set the {{CLASSPATH}} environment variable based on {{HADOOP_HOME}} or the hadoop executable: https://github.com/apache/arrow/blob/c43fab3d621bedef15470a1be43570be2026af20/python/pyarrow/hdfs.py#L134-L149

This is also mentioned in the documentation of the new HadoopFileSystem (https://arrow.apache.org/docs/python/filesystems.html#hadoop-file-system-hdfs):

> If CLASSPATH is not set, then it will be set automatically if the hadoop executable is in your system path, or if HADOOP_HOME is set.

However, this sentence was probably simply copied over from the docs about the legacy filesystem. And for the new HadoopFileSystem implementation, we don't have this logic to automatically set up {{CLASSPATH}}. 

Do we want to add this logic to the new implementation as well? (in cython, or actually in C++?) Or if not, we should update the docs to clarify that {{CLASSPATH}} is actually required.

cc [~apitrou]



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