RedisCluster scan_iter does not return all keys from all nodes #2003
Description
Version: What redis-py and what redis version is the issue happening on?
redis-py==4.1.2 and redis-cli 6.2.6
Platform: What platform / version? (For example Python 3.5.1 on Windows 7 / Ubuntu 15.10 / Azure)
Python 3.7.12 on MacOS 11.4
Description: I started a local Redis cluster with 6 nodes (3 master nodes with ports 6001-6003, 3 slave nodes with ports 6004-6006). I wrote 19 total items to the Redis cluster: 1 is stored by 6001, 13 by 6002, and 5 by 6003. I confirmed this by doing
$ redis-cli -c -p 6001
127.0.0.1:6001> KEYS *
1) "\x02\x00\x00\x00\x04\x00\x00\x00\x04\x00\x00\x00\x8b\x13\x00\x00integration_test_5d7072_1"
127.0.0.1:6001>
for each of the 3 master nodes.
However, when I call client.scan_iter(b"*"), I get a list containing only a single key, which is the key from node 6001. Here my client object was constructed as follows:
startup_nodes = [{'host': '127.0.0.1', 'port': '6001'}, {'host': '127.0.0.1', 'port': '6002'}, {'host': '127.0.0.1', 'port': '6003'}]
kwargs["startup_nodes"] = [
ClusterNode(**node) for node in startup_nodes
]
self._client = RedisCluster(**kwargs)
This looks to me like there is an issue with scan_iter on RedisClusters, where it doesn't return all keys from all nodes.