blpop blocked forever

[kingname]

Thanks for wanting to report an issue you've found in redis-py. Please delete this text and fill in the template below.
It is of course not always possible to reduce your code to a small test case, but it's highly appreciated to have as much data as possible. Thank you!

Version: What redis-py and what redis version is the issue happening on?

redis-py: 3.4.1
redis_version:4.0.9, single instance.

Platform: What platform / version? (For example Python 3.5.1 on Windows 7 / Ubuntu 15.10 / Azure)

Ubuntu 19.04
Python 3.7.3

Description: Description of your issue, stack traces from errors and code that reproduces the issue

My code:

import redis
client = redis.Redis()
while True:
    data = client.blpop('key', timeout=5 * 60)
    if not data:
        continue
    parse(data[1])

sometime, this code will block forever even if there are many datas in the list. Especially when the list is empty for a long time, and then I lpush some data to it, the code could not read data from list, just blocks here. I must restart the program, then it could continue to consume.

[andymccurdy]

This is a common question that has been answered before. Check out the linked comment here: #1305 (comment)

[andymccurdy]

Closing this as no response has been made. If you're still having an issue and the comments in #1305 aren't helpful, please feel free to reopen this.