python redis scan and flush caused lock?

Question

I used redis for synchronize some datas.

Precondition : Data inserted into redis continuously. (About 30,000 in 10 minutes)

Here is work flow that execute every 5 minutes.

1. Scan keys by specific pattern(ex. 'users*')

2. Get all values by keys

3. Flush all keys

In workflow 1, I used scan_iter() to avoid locking.

I wonder that in my workflow, there is any things to causing redis lock?

If data insertion and scanning keys occur simultaneously, it can cause locking?

Answer 1

If you are not using the ASYNC option then FLUSHDB and FLUSHALL are blocking commands.

https://redis.io/commands/flushall