Redis 6.2.2 - Released Mon April 19 19:00:00 IST 2021

Upgrade urgency: HIGH, if you're using ACL and pub/sub, CONFIG REWRITE, or suffering from performance regression. see below.

Bug fixes for regressions in previous releases of Redis 6.2:

• Fix BGSAVE, AOFRW, and replication slowdown due to child reporting CoW (#8645)
• Fix short busy loop when timer event is about to fire (#8764)
• Fix default user, overwritten and reset users losing pubsub channel permissions (#8723)
• Fix config rewrite with an empty save config resulsing in default save values (#8719)
• Fix not starting on alpine/libmusl without IPv6 (#8655)
• Fix issues with propagation and MULTI/EXEC in modules (#8617) Several issues around nested calls and thread safe contexts

Bug fixes that are only applicable to previous releases of Redis 6.2:

• ACL Pub/Sub channels permission handling for save/load scenario (#8794)
• Fix early rejection of PUBLISH inside MULTI-EXEC transaction (#8534)
• Fix missing SLOWLOG records for blocked commands (#8632)
• Allow RESET command during busy scripts (#8629)
• Fix some error replies were not counted on stats (#8659)

Bug fixes:

• Add a timeout mechanism for replicas stuck in fullsync (#8762)
• Process HELLO command even if the default user has no permissions (#8633)
• Client issuing a long running script and using a pipeline, got disconnected (#8715)
• Fix script kill to work also on scripts that use pcall (#8661)
• Fix list-compress-depth may compress more node than required (#8311)
• Fix redis-cli handling of rediss:// URL scheme (#8705)
• Cluster: Skip unnecessary check which may prevent failure detection (#8585)
• Cluster: Fix hang manual failover when replica just started (#8651)
• Sentinel: Fix info-refresh time field before sentinel get first response (#8567)
• Sentinel: Fix possible crash on failed connection attempt (#8627)
• Systemd: Send the readiness notification when a replica is ready to accept connections (#8409)

Command behavior changes:

• ZADD: fix wrong reply when INCR used with GT/LT which blocked the update (#8717) It was responding with the incremented value rather than nil
• XAUTOCLAIM: fix response to return the next available id as the cursor (#8725) Previous behavior was retuning the last one which was already scanned
• XAUTOCLAIM: fix JUSTID to prevent incrementing delivery_count (#8724)

New config options:

• Add cluster-allow-replica-migration config option (#5285)
• Add replica-announced config option (#8653)
• Add support for plaintext clients in TLS cluster (#8587)
• Add support for reading encrypted keyfiles (#8644)

Improvements:

• Fix performance regression in BRPOP on Redis 6.0 (#8689)
• Avoid adding slowlog entries for config with sensitive data (#8584)
• Improve redis-cli non-binary safe string handling (#8566)
• Optimize CLUSTER SLOTS reply (#8541)
• Handle remaining fsync errors (#8419)

Info fields and introspection changes:

• Strip % sign from current_fork_perc info field (#8628)
• Fix RSS memory info on FreeBSD (#8620)
• Fix client_recent_max_input/output_buffer in 'INFO CLIENTS' when all clients drop (#8588)
• Fix invalid master_link_down_since_seconds in info replication (#8785)

Platform and deployment-related changes:

• Fix FreeBSD <12.x builds (#8603)

Modules:

• Add macros for RedisModule_log logging levels (#4246)
• Add RedisModule_GetAbsExpire / RedisModule_SetAbsExpire (#8564)
• Add a module type for key space notification (#8759)
• Set module eviction context flag only in masters (#8631)
• Fix unusable RedisModule_IsAOFClient API (#8596)
• Fix missing EXEC on modules propagation after failed EVAL execution (#8654)
• Fix edge-case when a module client is unblocked (#8618)