[chromy]

mget in redis-py-cluster returns the same results as (the new) mget_nonatomic
method on clusters in redis >= 4.1.0.
Here we change our use of mget to call mget_nonatomic if defined.

We support:

• 3.4.1 <= redis <= 3.5.3 via redis-py-cluster 2.1.x
• redis >= 4.1.0 without redis-py-cluster

Versions of redis since 4.1.0 incorporated the cluster management code.
Currently we handle this in the code here:

taskbroker/clients/python/src/taskbroker_client/scheduler/storage.py

Lines 9 to 14 in fb997f6

	if TYPE_CHECKING:
	try:
	# redis>=4.1 ships cluster support natively
	from redis import RedisCluster
	except ImportError: # pragma: no cover - redis<4 fallback via the `cluster` extra
	from rediscluster import RedisCluster

We make use of mget here:

taskbroker/clients/python/src/taskbroker_client/scheduler/storage.py

Lines 171 to 173 in 898de62

	new_values = self._redis.mget([self._make_key(sk) for sk in storage_keys])
	compat_values = self._redis.mget([self._make_key(ck) for ck in compat_keys])
	legacy_values = self._redis.mget([self._make_key(lk) for lk in legacy_keys])

This can go to at least 4 backends:

• redis <= 3.5.3 no-cluster → mget
• redis-py-cluster 2.1.x cluster → mget (but with mget_nonatomic semantics)
• redis >= 4.1.0 no-cluster → mget
• redis >= 4.1.0 cluster → mget_nonatomic

Here is an LLM summary of the status of mget and mget_nonatomic across the various versions:

Client / version	mget across slots	mget_nonatomic
redis-py-cluster 1.x (on redis-py 2.x)	Doesn't raise: one GET per key, not atomic (1.3.6 client.py:675)	Doesn't exist
redis-py-cluster 2.x (on redis-py 3.x, last release 2.1.3)	Same: one GET per key (2.1.3 client.py:1003)	Doesn't exist
redis-py 4.0	No cluster client	-
redis-py 4.1.0 (cluster support added in #1660)	Raises RedisClusterException (cluster.py:803)	Added: one MGET per slot, one after another (commands/cluster.py:26)
redis-py 4.3.0	Raises, async RedisCluster too (#2099)	Async version added (commands/cluster.py:205)
redis-py 4.3.4	Raises	Per-slot MGETs run as one pipeline (#2230)
redis-py 5.0.0	Raises (cluster.py:1002)	Unchanged (commands/cluster.py:156)
redis-py 6.x / 7.x	Raises	Unchanged
redis-py 8.x (8.1.0)	Raises (cluster.py:1494)	Unchanged (commands/cluster.py:234)

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