部署GaussDB集群引发AttributeError: module ‘enum‘ has no attribute ‘IntFlag‘?

现象描述

CPU：Kunpeng-920
OS：Kylin Linux Advanced Server V10 (Tercel) 4.19.90-17.ky10.aarch64

在部署过GaussDB分布式数据库的服务器上通过yum源来安装其他模块的时候，发现yum源不可用了，但是在印象中这套服务器的yum源一直是可用的，我们先来看一下这个yum报错信息

# yum list
Traceback (most recent call last):
  File "/usr/bin/yum", line 57, in <module>
    from dnf.cli import main
  File "/usr/lib/python3.7/site-packages/dnf/__init__.py", line 23, in <module>
    import dnf.pycomp
  File "/usr/lib/python3.7/site-packages/dnf/pycomp.py", line 21, in <module>
    from gettext import NullTranslations
  File "/usr/lib64/python3.7/gettext.py", line 49, in <module>
    import locale
  File "/usr/lib64/python3.7/locale.py", line 16, in <module>
    import re
  File "/usr/lib64/python3.7/re.py", line 143, in <module>
    class RegexFlag(enum.IntFlag):
AttributeError: module 'enum' has no attribute 'IntFlag'

错误分析

AttributeError: module ‘enum’ has no attribute 'IntFlag’
这个报错很明显与enum模块有关系，经查询是因为enum34与当前python3.7版本不兼容，需要卸载服务器的enum34。

This is likely caused by the package enum34. Since python 3.4 there's a standard library enum module, so you should uninstall enum34, which is no longer compatible with the enum in the standard library since enum.IntFlag was added in python 3.6.

处理方法是：
1、直接用pip卸载：pip uninstall enum34
2、如果没有pip，直接删除 python3.7/site-packages 目录下的enum开头的文件也成

但是这台服务器在python3.7/site-packages 目录下并没有找到enum开头的文件，开始全文检索

# find / -name enum34*
/home/omm/test/script/gspylib/inspection/lib/kafka-python/kafka/vendor/enum34.py
/home/omm/test/lib/kafka-python/kafka/vendor/enum34.py
/opt/software/GaussDB_Kernel/lib/kafka-python/kafka/vendor/enum34.py
/opt/software/GaussDB_Kernel/script/gspylib/inspection/lib/kafka-python/kafka/vendor/enum34.py

在GaussDB的安装包中确实有enum34.py文件，那么我们在执行yum命令的时候肯定是引用了这个包，回想了一下，GaussDB分布式在安装过程中，会将安装包本身的动态库添加到/etc/profile文件中,看来是这块的问题了。

if [ -n "${BASH_VERSION-}" ] ; then
        if [ -f /etc/bashrc ] ; then
                # Bash login shells run only /etc/profile
                # Bash non-login shells run only /etc/bashrc
                # Check for double sourcing is done in /etc/bashrc.
                . /etc/bashrc
       fi
fi
export UNPACKPATH=/opt/software/GaussDB_Kernel
export PATH=$UNPACKPATH/script/gspylib/pssh/bin:$UNPACKPATH/script:$PATH
export LD_LIBRARY_PATH=/opt/mogdbtool/pylib:$LD_LIBRARY_PATH
export PYTHONPATH=/opt/mogdbtool/pylib
export LD_LIBRARY_PATH=/opt/mogdbtool/pylib/libsimsearch:$LD_LIBRARY_PATH

解决方法

注释掉/etc/profile中有关GaussDB的信息，然后重新登录服务器，问题解决。

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Installed Packages
GConf2.aarch64                                        3.2.6-24.ky10                          @anaconda