[英]django-redis invalid DB index error and redis url's meaning
我正在使用django-redis: https : //niwinz.github.io/django-redis/latest/
在设置和测试缓存时,我有一个问题。
从这里: https : //niwinz.github.io/django-redis/latest/#_installation
有这样的代码:
CACHES = {
"default": {
"BACKEND": "django_redis.cache.RedisCache",
"LOCATION": "redis://127.0.0.1:6379/1",
"OPTIONS": {
"CLIENT_CLASS": "django_redis.client.DefaultClient",
}
}
}
当我将此不变的任何LOCATION
代码用作: "LOCATION": "redis://127.0.0.1:6379/1"
,它做得很好。 甚至"LOCATION": "redis://127.0.0.1:6379/2"
看起来效果很好。
但是,如果我将其更改为"LOCATION": "redis://127.0.0.1:6379/220"
,
它返回invalid DB index error
。
题:
为什么会这样?
参数从"LOCATION": "redis://127.0.0.1:6379/parameter"
意味着什么?
这是回溯:
Environment:
Request Method: GET
Request URL: http://127.0.0.1:8000/test/
Django Version: 2.0.2
Python Version: 3.6.3
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'post',
'website']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.cache.UpdateCacheMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.cache.FetchFromCacheMiddleware']
Traceback:
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django_redis\cache.py" in _decorator
32. return method(self, *args, **kwargs)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django_redis\cache.py" in get
81. client=client)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django_redis\client\default.py" in get
204. raise ConnectionInterrupted(connection=client, parent=e)
During handling of the above exception (Redis ResponseError: invalid DB index), another exception occurred:
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\core\handlers\exception.py" in inner
35. response = get_response(request)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\utils\deprecation.py" in __call__
93. response = self.process_request(request)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\middleware\cache.py" in process_request
133. cache_key = get_cache_key(request, self.key_prefix, 'GET', cache=self.cache)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django\utils\cache.py" in get_cache_key
360. headerlist = cache.get(cache_key)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django_redis\cache.py" in _decorator
39. raise e.parent
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\django_redis\client\default.py" in get
202. value = client.get(key)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\client.py" in get
976. return self.execute_command('GET', name)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\client.py" in execute_command
667. connection.send_command(*args)
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\connection.py" in send_command
610. self.send_packed_command(self.pack_command(*args))
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\connection.py" in send_packed_command
585. self.connect()
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\connection.py" in connect
493. self.on_connect()
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\connection.py" in on_connect
567. if nativestr(self.read_response()) != 'OK':
File "D:\pythonDev\interpreters\forMultichat\lib\site-packages\redis\connection.py" in read_response
629. raise response
Exception Type: ResponseError at /test/
Exception Value: invalid DB index
默认情况下,Redis服务器配置有16个(0..15)共享数据库。 通常,不使用数据库0以外的任何东西都被认为是不好的做法。
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