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redis-clustering

Name: Redis Clustering
Author: redis

// Redis Cluster and replication guidance covering hash tags for multi-key operations, avoiding CROSSSLOT errors, and reading from replicas to scale read-heavy workloads. Use when designing keys for a sharded Redis Cluster, debugging CROSSSLOT errors on MGET / SDIFF / pipelines, configuring a multi-key transaction in a cluster, or routing reads to replicas for caches, analytics, or dashboards.

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stars:64

forks:17

updated:2026年5月27日 07:58

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SKILL.md

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name	redis-clustering
description	Redis Cluster and replication guidance covering hash tags for multi-key operations, avoiding CROSSSLOT errors, and reading from replicas to scale read-heavy workloads. Use when designing keys for a sharded Redis Cluster, debugging CROSSSLOT errors on MGET / SDIFF / pipelines, configuring a multi-key transaction in a cluster, or routing reads to replicas for caches, analytics, or dashboards.
license	MIT
metadata	{"author":"Redis, Inc.","version":"0.1.0"}

Redis Clustering

Guidance for designing keys and routing reads in a sharded Redis Cluster (and in standalone primary/replica replication). Covers the two failure modes that bite most new cluster users: CROSSSLOT errors on multi-key operations, and overloading primaries with read traffic.

When to apply

Designing keys for a Redis Cluster deployment.
Debugging a CROSSSLOT error on MGET, SDIFF, transactions, or pipelines.
Implementing transactions / Lua scripts that touch multiple keys.
Scaling out read traffic without adding shards.

1. Hash tags for multi-key operations

Redis Cluster distributes keys across 16,384 slots by hashing the key name. Any command that touches multiple keys (MGET, SDIFF, SUNIONSTORE, transactions, pipelines, Lua scripts with multiple KEYS[]) requires all keys to live on the same slot — otherwise the server returns a CROSSSLOT error.

Hash tags force this: the part between { and } is the only thing hashed for slot assignment, so two keys sharing a hash tag always land together.

# Same slot — multi-key ops work
redis.set("{user:1001}:profile",  "...")
redis.set("{user:1001}:settings", "...")
redis.lmove("{user:1001}:pending", "{user:1001}:processed", "LEFT", "RIGHT")

# Different keys, no hash tag — CROSSSLOT on multi-key commands in cluster mode
redis.set("user:1001:profile",  "...")
redis.set("user:1001:settings", "...")
pipe = redis.pipeline()
pipe.get("user:1001:profile")
pipe.get("user:1001:settings")
pipe.execute()  # CROSSSLOT error in cluster

Rules of thumb:

Use a tag scoped to the meaningful entity, e.g. {user:1001}. Avoid bare {1001} — unrelated namespaces (purchase:{1001}, employee:{1001}) would all collide on the same slot.
Only tag where you actually need multi-key ops. Tagging everything creates hotspots and defeats the point of sharding.
A single-key command on a hash-tagged key works fine, so adding tags later is incremental — but renaming keys in production is painful, so plan tagging up front for entities you'll group.

See references/hash-tags.md.

2. Read replicas for read-heavy workloads

If reads dominate writes, route them to replicas to free primary capacity. Works both in Redis Cluster (each shard has 1+ replica) and in standalone primary/replica replication.

# Redis Cluster: enable replica reads on the client
from redis.cluster import RedisCluster

rc = RedisCluster(host="localhost", port=6379, read_from_replicas=True)
rc.set("key", "value")     # → primary
value = rc.get("key")       # → may be served by a replica

For non-cluster setups, point two clients at the right nodes:

primary = Redis(host="primary-host", port=6379)
replica = Redis(host="replica-host", port=6379)
primary.set("key", "value")
value = replica.get("key")

The trade-off is consistency: replicas are eventually consistent. Don't read your own writes from a replica; don't use replica reads for anything that requires strict freshness (financial balances, idempotency state). Good fits: cache layers, analytics, dashboards, recommendation feeds.

See references/read-replicas.md.

References

related-skills.json

同仓库

iris-development.md

from "redis/agent-skills"

Iris is Redis's umbrella for AI-focused products. Use this skill when integrating with the Iris Redis Agent Memory (RAM) data plane on Redis Cloud — recording session events for an AI agent, creating or searching long-term memories, configuring a memory store, or tuning background memory promotion. Code examples use the official `redis-agent-memory` (Python) and `@redis-iris/agent-memory` (TypeScript) SDKs.

2026-05-2764

redis-connections.md

from "redis/agent-skills"

Redis client and connection guidance covering connection pooling, multiplexing, pipelining, client-side caching with RESP3, avoiding slow commands (KEYS, SMEMBERS, HGETALL), and tuning socket timeouts. Use when configuring a Redis client (redis-py, Jedis, Lettuce, NRedisStack), batching commands for throughput, eliminating per-request connection creation, iterating large keyspaces with SCAN, enabling client-side caching for read-heavy workloads, or setting connect and read timeouts.

2026-05-2764

redis-core.md

from "redis/agent-skills"

Core Redis modeling guidance — choose the right data structure (String, Hash, List, Set, Sorted Set, JSON, Stream, Vector Set) and use consistent colon-separated key names. Use when designing a Redis data model, caching objects, deciding between Hash and JSON, building counters, leaderboards, membership sets, or session stores, or when reviewing/cleaning up Redis key naming.

2026-05-2764

redis-observability.md

from "redis/agent-skills"

Redis observability guidance — which metrics to monitor (memory, connections, hit ratio, ops/sec, rejected connections), which built-in commands to reach for during incident triage (SLOWLOG, INFO, MEMORY DOCTOR, CLIENT LIST, FT.PROFILE), and when to use the Redis Insight GUI. Use when setting up monitoring or alerts for a Redis instance, diagnosing a performance regression, profiling a slow FT.SEARCH query, or wiring Redis metrics into Prometheus, Datadog, or similar.

2026-05-2764

redis-query-engine.md

from "redis/agent-skills"

Redis Query Engine (RQE) guidance covering FT.CREATE schema design, field type selection (TEXT, TAG, NUMERIC, GEO, GEOSHAPE, VECTOR), DIALECT 2 query syntax, efficient FT.SEARCH and FT.AGGREGATE queries, zero-downtime index updates via aliases, and the SKIPINITIALSCAN option. Use when defining a search index on Hash or JSON documents, picking between TEXT and TAG for filtering, writing FT.SEARCH queries with filters and SORTBY, managing or swapping indexes in production, or troubleshooting slow searches with FT.PROFILE.

2026-05-2764

redis-security.md

from "redis/agent-skills"

Redis security guidance covering authentication (requirepass and ACL users), TLS, ACL-based least-privilege access control, restricting network exposure via bind and protected-mode, firewall rules, and disabling dangerous commands. Use when deploying Redis to production, defining ACL users for an application, configuring TLS connections, locking down a Redis instance behind a firewall, or auditing a Redis deployment for security hardening.

2026-05-2764

package.json

"author": "redis"

"repository": "redis/agent-skills"

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软件开发工程师计算机与数学类职业15-1252L4

name	redis-clustering
description	Redis Cluster and replication guidance covering hash tags for multi-key operations, avoiding CROSSSLOT errors, and reading from replicas to scale read-heavy workloads. Use when designing keys for a sharded Redis Cluster, debugging CROSSSLOT errors on MGET / SDIFF / pipelines, configuring a multi-key transaction in a cluster, or routing reads to replicas for caches, analytics, or dashboards.
license	MIT
metadata	{"author":"Redis, Inc.","version":"0.1.0"}

Redis Clustering

When to apply

Designing keys for a Redis Cluster deployment.
Debugging a CROSSSLOT error on MGET, SDIFF, transactions, or pipelines.
Implementing transactions / Lua scripts that touch multiple keys.
Scaling out read traffic without adding shards.

1. Hash tags for multi-key operations

Hash tags force this: the part between { and } is the only thing hashed for slot assignment, so two keys sharing a hash tag always land together.

# Same slot — multi-key ops work
redis.set("{user:1001}:profile",  "...")
redis.set("{user:1001}:settings", "...")
redis.lmove("{user:1001}:pending", "{user:1001}:processed", "LEFT", "RIGHT")

# Different keys, no hash tag — CROSSSLOT on multi-key commands in cluster mode
redis.set("user:1001:profile",  "...")
redis.set("user:1001:settings", "...")
pipe = redis.pipeline()
pipe.get("user:1001:profile")
pipe.get("user:1001:settings")
pipe.execute()  # CROSSSLOT error in cluster

Rules of thumb:

Use a tag scoped to the meaningful entity, e.g. {user:1001}. Avoid bare {1001} — unrelated namespaces (purchase:{1001}, employee:{1001}) would all collide on the same slot.
Only tag where you actually need multi-key ops. Tagging everything creates hotspots and defeats the point of sharding.
A single-key command on a hash-tagged key works fine, so adding tags later is incremental — but renaming keys in production is painful, so plan tagging up front for entities you'll group.

See references/hash-tags.md.

2. Read replicas for read-heavy workloads

If reads dominate writes, route them to replicas to free primary capacity. Works both in Redis Cluster (each shard has 1+ replica) and in standalone primary/replica replication.

# Redis Cluster: enable replica reads on the client
from redis.cluster import RedisCluster

rc = RedisCluster(host="localhost", port=6379, read_from_replicas=True)
rc.set("key", "value")     # → primary
value = rc.get("key")       # → may be served by a replica

For non-cluster setups, point two clients at the right nodes:

primary = Redis(host="primary-host", port=6379)
replica = Redis(host="replica-host", port=6379)
primary.set("key", "value")
value = replica.get("key")

See references/read-replicas.md.

redis-clustering

Redis Clustering

When to apply

1. Hash tags for multi-key operations

2. Read replicas for read-heavy workloads

References

同仓库更多 Skills

Redis Clustering

When to apply

1. Hash tags for multi-key operations

2. Read replicas for read-heavy workloads

References

同仓库更多 Skills