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I receive following output:

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

I couldn’t find any issue related to this particular error. I emptied/flushed all redis databases, so there should be no data there. I assume it has something to do with eventlet and patching. But even when I put following code right at the beginning of the file, the error appears.

import eventlet
eventlet.monkey_path()

What does this error mean?

2

Answers


  1. Chosen as BEST ANSWER

    Finally, I came up with the answer to my problem. When connecting to redis with python, I specified the database with the number 0.

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

    After changing the dabase to number 1 it worked.

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

  2. Another way is to set protected_mode to no in etcredisredis.conf. Recommended when running redis locally.

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