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redis-py Production Incidents & Fixes

Verified incident playbooks, reproduction steps, and fixes collected from GitHub issues and PRs.

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Grouped incident families for redis-py (use these when you’re debugging during an outage).

Configuration error
issues: 94 fresh: 26 indexable
Retry storm
issues: 7 fresh: 5 indexable
Data consistency
issues: 16 fresh: 4 indexable
Race condition
issues: 10 fresh: 2 indexable

Top Queries / Error Strings

These are the lines developers tend to paste into Google during incidents.

'SET': lambda r: r and nativestr(r) == 'OK',
("rediss", connection.SSLConnection),
... (truncated) ...
... print(item["type"])
1196 raise ConnectionError("Too many connections")
4.0.0b1 breaks script_flush on pre-6.2 server
4.0.0rc1 breaks various zrange commands on older servers
ACL GETUSER - add selectors and change the format of key and channel patterns from a list to their rule representation
Add SSL Environments for Testing
Add support for missing command LATENCY DOCTOR

Tip: treat upgrades as deploys. Snapshot outputs (OpenAPI, JSON schemas) and diff them in CI before rollout.

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slowlog_get() raises TypeError when decode_responses=True
#1238 · redis/redis-py
Question: why is `blocking` missing as a lock() parameter?
#1348 · redis/redis-py
error in set when ex is a float is confusing
#1576 · redis/redis-py
4.0.0b1 breaks script_flush on pre-6.2 server
#1639 · redis/redis-py
AttributeError: 'Redis' object has no attribute 'sentinel_masters'
#1714 · redis/redis-py
Another race condition in health checks and pubsub
#1740 · redis/redis-py
exception in listen
#1788 · redis/redis-py
Question: resolving hostname when retry on connection timeout
#1833 · redis/redis-py
AttributeError in UnixDomainSocketConnection starting v4.1.0
#1902 · redis/redis-py
redis.asyncio trying to reuse a closed connection writer
#2065 · redis/redis-py
asyncio RedisCluster is not working for Amazon Elasticache
#2233 · redis/redis-py
byte vector is incorrectly decoded as utf-8 string in ft result class
#2275 · redis/redis-py
WRONGPASS response doesn't raise AuthenticationError exception
#2325 · redis/redis-py
Invalid Default Argument For LMPOP
#2414 · redis/redis-py
AsyncIO Cluster Mode Lock doesn't work
#2420 · redis/redis-py
Missing "blocking" argument when initializing blocking in asynchronous mode
#2453 · redis/redis-py
KeyError in asyncio cluster get_node_from_slot
#2437 · redis/redis-py
'UnixDomainSocketConnection' object has no attribute '_command_packer'
#2581 · redis/redis-py
[Bug] Aioredis cancellation of blocking operations stucks next operations
#2579 · redis/redis-py
Redis pubsub task cancellation raises ConnectionError
#2717 · redis/redis-py
TimeoutError during ClusterPipeline makes the client unrecoverable
#3130 · redis/redis-py
`SentinelManagedConnection` delays new master detection and Risks data loss
#3560 · redis/redis-py
Retry Mechanism Fails When Redis Container is Paused
#3555 · redis/redis-py
max_connections is not being honoured in RedisCluster mode
#3684 · redis/redis-py
Async lock can enter a deadlock if it is cancelled while being released
#3847 · redis/redis-py
query object is not outputing the `TIMEOUT` argument in case of 0 ( 0 means unlimited for RediSearch TIMEOUT parameter )
#2839 · redis/redis-py
Instantiating BlockingConnectionPool.from_url with timeout in query args fails
#2983 · redis/redis-py
`redis.cluster.RedisCluster` with RESP3 and hiredis causes segmentation fault
#3074 · redis/redis-py
Sub-unsub-resub causes redispy to forget the channel
#764 · redis/redis-py
redis._compat: global name 'InterruptedError' is not defined
#845 · redis/redis-py
connection pool in multi-thread is not thread safe
#906 · redis/redis-py
KeyError on repr in any ConnectionPool without host/port/db arguments
#995 · redis/redis-py
Misleading docstring of class `Redis`
#1442 · redis/redis-py
LMOVE, BLMOVE return incorrect response
#1776 · redis/redis-py
v4.3.2 contains backwards incompatible change to `redis.lock.Lock`
#2209 · redis/redis-py
v4.3.3 continues to contain backwards incompatible change to ``redis.lock.Lock``
#2223 · redis/redis-py
RediSearch: search command doesn't support asyncio Pipeline
#2279 · redis/redis-py
4.6.0 - ConnectionError max number of clients reached
#2831 · redis/redis-py
sentinel_get_master_addr_by_name() returns boolean instead of (host, port) pair
#3139 · redis/redis-py
Adding required `message` to `LockError` broke backwards compatibility
#3168 · redis/redis-py
Redundant async-timeout dependency in Redis 5.0.2
#3174 · redis/redis-py
Release a lock from a non-owned thread should raise proper error
#3535 · redis/redis-py
Async performance issue since version 5.3.0
#3692 · redis/redis-py