Python HDFS: add Kerberos authentication support
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hadoop
improvement
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python
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Description
The HDFS client used by Beam supports Kerberos.
Initial idea: add a flag \--hdfs_client that defaults to "INSECURE" and also accepts "KERBEROS". This flag will control initialization of self._hdfs_client.
HDFS client docs:
https://hdfscli.readthedocs.io/en/latest/api.html#module-hdfs.ext.kerberos
The HDFS client seems to use this Kerberos library:
https://pypi.org/project/requests-kerberos/
Imported from Jira [BEAM-11750](https://issues.apache.org/jira/browse/BEAM-11750). Original Jira may contain additional context.
Reported by: udim.
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