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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