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

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eventlet与修补有关。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？

标签： pythonredispython-requestsweb-crawlereventlet

解决方案

最后，我想出了我的问题的答案。用python连接redis时，我用数字指定了数据库0。

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

将数据库更改为数字后1，它起作用了。

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

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