如何处理“Redis.exceptions.ConnectionError：连接有数据”答案

【问题标题】：How to handle "Redis.exceptions.ConnectionError: Connection has data"如何处理“Redis.exceptions.ConnectionError：连接有数据”
【发布时间】：2020-07-18 14:41:41
【问题描述】：

我收到以下输出：

Traceback (most recent call last):
  File "/home/ec2-user/env/lib64/python3.7/site-packages/redis/connection.py", line 1192, in get_connection
    raise ConnectionError('Connection has data')
redis.exceptions.ConnectionError: Connection has data

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ec2-user/env/lib64/python3.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers
    timer()
  File "/home/ec2-user/env/lib64/python3.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__
    cb(*args, **kw)
  File "/home/ec2-user/env/lib64/python3.7/site-packages/eventlet/greenthread.py", line 214, in main
    result = function(*args, **kwargs)
  File "crawler.py", line 53, in fetch_listing
    url = dequeue_url()
  File "/home/ec2-user/WebCrawler/helpers.py", line 109, in dequeue_url
    return redis.spop("listing_url_queue")
  File "/home/ec2-user/env/lib64/python3.7/site-packages/redis/client.py", line 2255, in spop
    return self.execute_command('SPOP', name, *args)
  File "/home/ec2-user/env/lib64/python3.7/site-packages/redis/client.py", line 875, in execute_command
    conn = self.connection or pool.get_connection(command_name, **options)
  File "/home/ec2-user/env/lib64/python3.7/site-packages/redis/connection.py", line 1197, in get_connection
    raise ConnectionError('Connection not ready')
redis.exceptions.ConnectionError: Connection not ready

我找不到与此特定错误相关的任何问题。我清空/刷新了所有 redis 数据库，所以那里应该没有数据。我认为它与eventlet 和修补有关。但即使我将以下代码放在文件的开头，也会出现错误。

import eventlet
eventlet.monkey_path()

这个错误是什么意思？

【问题讨论】：

标签： python redis python-requests web-crawler eventlet

【解决方案1】：

另一种方法是在etc\redis\redis.conf 中将protected_mode 设置为no。建议在本地运行 redis 时使用。

【讨论】：

【解决方案2】：

最后，我想出了我的问题的答案。用python连接redis时，我指定了编号为0的数据库。

redis = redis.Redis(host=example.com, port=6379, db=0)

将数据库更改为数字1 后，它起作用了。

redis = redis.Redis(host=example.com, port=6379, db=1)

【讨论】：