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Posted to common-issues@hadoop.apache.org by "Jonathan Barber (JIRA)" <ji...@apache.org> on 2013/04/22 12:37:16 UTC
[jira] [Updated] (HADOOP-9491) HOD fails to run under python 2.6.1
[ https://issues.apache.org/jira/browse/HADOOP-9491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Barber updated HADOOP-9491:
------------------------------------
Attachment: HADOOP-9491.patch
Rename member ._dict to ._hod_dict to remove conflict with identically named ConfigParser member.
> HOD fails to run under python 2.6.1
> -----------------------------------
>
> Key: HADOOP-9491
> URL: https://issues.apache.org/jira/browse/HADOOP-9491
> Project: Hadoop Common
> Issue Type: Bug
> Components: contrib/hod
> Affects Versions: 1.1.2
> Environment: RHEL6.4, python-2.6.6-36.el6.x86_64
> Reporter: Jonathan Barber
> Priority: Critical
> Fix For: 1.1.2
>
> Attachments: HADOOP-9491.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> Running HOD from the hadoop-1.1.2-bin.tar.gz distribution with python 2.6.6 on RHEL6.4 fails with the output:
> $ ./contrib/hod/bin/hod -c contrib/hod/conf/hodrc list -d /tmp/hod-jbarber
> /homes/jbarber/hadoop-1.1.2/contrib/hod/hodlib/Common/threads.py:19: DeprecationWarning: The popen2 module is deprecated. Use the subprocess module.
> from popen2 import Popen4, Popen3, MAXFD
> Traceback (most recent call last):
> File "hod", line 411, in <module>
> options=hodOptions)
> File "/homes/jbarber/hadoop-1.1.2/contrib/hod/hodlib/Common/setup.py", line 449, in __init__
> self.read(configFile)
> File "/usr/lib64/python2.6/ConfigParser.py", line 286, in read
> self._read(fp, filename)
> File "/usr/lib64/python2.6/ConfigParser.py", line 475, in _read
> cursect = self._dict()
> TypeError: 'dict' object is not callable
> This error appears because the Hadoop "config" class is an instance of the python ConfigParser class with a class variable called ._dict. However, the internals of the ConfigParser class appears to have been changed with later versions of python to have a method called ._dict() which now conflicts with the "config" classes usage.
> This can be fixed by changing all references in contrib/hod/hodlib/Common/setup.py from ._dict to ._hod_dict, e.g.:
> sed -i 's/\._dict/._hod_dict/' contrib/hod/hodlib/Common/setup.py
> I tested this change by repeating the hod "list" command successfully.
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