一、问题描述

　　在hue的web界面登录了超级管理员用户（admin），想要切换其他用户（hive），注销不成功（地址栏报错：hue 500 服务器错误，然后又自动登录到超级管理员账户admin）。无其他明显报错，错误日志摘要：

　'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

二、环境描述

　　CM和CDH都是6.2.0版本，hue为4.3.0版本

三、错误日志

[01/Sep/2021 15:05:21 +0800] exception    ERROR    Internal Server Error: /accounts/logout/
Traceback (most recent call last):
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/handlers/base.py", line 249, in _legacy_get_response
    response = self._get_response(request)
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/build/env/lib/python2.7/site-packages/Django-1.11-py2.7.egg/django/utils/decorators.py", line 185, in inner
    return func(*args, **kwargs)
  File "/opt/cloudera/parcels/CDH-6.2.0-1.cdh6.2.0.p0.967373/lib/hue/desktop/core/src/desktop/auth/views.py", line 216, in dt_logout
    LOG.warn("Error closing Impala session: %s" % e)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

四、解决方法

　　在/opt/cloudera/parcels/CDH/lib/hue/build/env/lib/python2.7/site-packages目录下创建sitecustomize.py文件，编辑内容如下：

#encoding=utf8
import sys
reload(sys)
sys.setdefaultencoding('utf8')

　　配置完成后在CM平台重启hue服务。

　　恢复正常登录。

五、总结

　　因为当前系统的Python版本为Python 2.x，默认编码是ascii，注销过程中出现了无法解析的字符，解决方法是设置utf-8字符集。