redis runtime_error ai_generated true

ERR Error claiming pending messages for consumer 'myconsumer' in group 'mygroup': no such consumer

ID: redis/stream-group-claim-failure

Also available as: JSON · Markdown · 中文
90%Fix Rate
85%Confidence
1Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Redis 6.2 active — — —
Redis 7.0 active — — —
Redis 7.2 active — — —

Root Cause

Attempting to claim pending messages for a consumer that does not exist in the consumer group.

generic

中文

尝试为消费组中不存在的消费者认领待处理消息。

Official Documentation

https://redis.io/commands/xclaim/

Workarounds

  1. 95% success Create the consumer explicitly before claiming: `XGROUP CREATECONSUMER mystream mygroup myconsumer` 
    Create the consumer explicitly before claiming: `XGROUP CREATECONSUMER mystream mygroup myconsumer`
  2. 85% success Use XPENDING to list pending messages and reassign them manually with XCLAIM after ensuring the consumer exists. 
    Use XPENDING to list pending messages and reassign them manually with XCLAIM after ensuring the consumer exists.

中文步骤

  1. Create the consumer explicitly before claiming: `XGROUP CREATECONSUMER mystream mygroup myconsumer`
  2. Use XPENDING to list pending messages and reassign them manually with XCLAIM after ensuring the consumer exists.

Dead Ends

Common approaches that don't work:

  1. 30% fail

    The consumer may have been auto-created by XREADGROUP and then deleted, causing the manual creation to fail if the group is in a bad state.

  2. 50% fail

    This loses all pending messages and consumer offsets, which may be unacceptable in production.

  3. 40% fail

    The error persists if the group metadata is corrupted or the stream is in an inconsistent state.