redis/redis-py · error · RedisClusterException

All slots are not covered after query all startup_nodes. {le

Error message

All slots are not covered after query all startup_nodes. {len(tmp_slots)} of {REDIS_CLUSTER_HASH_SLOTS} covered...

What it means

Error "All slots are not covered after query all startup_nodes. {len(tmp_slots)} of {REDIS_CLUSTER_HASH_SLOTS} covered..." thrown in redis/redis-py.

Source

Thrown at redis/cluster.py:2786

                if fully_covered:
                    # Don't need to continue to the next startup node if all
                    # slots are covered
                    break

            if not startup_nodes_reachable:
                raise RedisClusterException(
                    f"Redis Cluster cannot be connected. Please provide at least "
                    f"one reachable node: {str(exception)}"
                ) from exception

            # Create Redis connections to all nodes
            self.create_redis_connections(list(tmp_nodes_cache.values()))

            # Check if the slots are not fully covered
            if not fully_covered and self._require_full_coverage:
                # Despite the requirement that the slots be covered, there
                # isn't a full coverage
                raise RedisClusterException(
                    f"All slots are not covered after query all startup_nodes. "
                    f"{len(tmp_slots)} of {REDIS_CLUSTER_HASH_SLOTS} "
                    f"covered..."
                )

            # Set the tmp variables to the real variables
            with self._lock:
                self.nodes_cache = tmp_nodes_cache
                self.slots_cache = tmp_slots
                # Set the default node
                self.default_node = self.get_nodes_by_server_type(PRIMARY)[0]
                if self._dynamic_startup_nodes:
                    # Populate the startup nodes with all discovered nodes
                    self.startup_nodes = tmp_nodes_cache
                # Increment the epoch to signal that initialization has completed
                self._epoch += 1
            # Dispatch so listeners (e.g. ClusterPubSub) can reconcile per-node
            # state after slot ownership may have changed. A listener must not

View on GitHub (pinned to da03cdc7e8)

When it happens

Trigger: Thrown at redis/cluster.py:2786 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of redis/redis-py@da03cdc7e8 (2026-08-04). Data as JSON: /data/errors/e64c02ae289ae607.json. Report an issue: GitHub.