ERM redis system_error ai_generated true

错误：复制积压缓冲区溢出，断开副本连接

Error: Replication backlog buffer overflow, disconnecting replica

ID: redis/replica-repl-backlog-overflow

其他格式: JSON · Markdown 中文 · English
85%修复率
88%置信度
1证据数
2024-01-10首次发现

版本兼容性

版本状态引入弃用备注
Redis 6.2.6 active — — —
Redis 7.0.12 active — — —
Redis 7.2.4 active — — —

根因分析

主节点上的复制积压缓冲区超过配置大小，导致节点断开副本连接以防止内存耗尽。

English

The replication backlog buffer on the primary node exceeded its configured size, causing the node to disconnect replicas to prevent memory exhaustion.

generic

官方文档

https://redis.io/docs/latest/operate/oss_and_stack/replication/

解决方案

  1. Increase the replication backlog size: CONFIG SET repl-backlog-size 100mb. This provides more buffer for replicas to catch up.
  2. Add more replicas or improve network bandwidth to reduce replication lag. Monitor with INFO replication.
  3. Enable client output buffer limits for replicas: CONFIG SET client-output-buffer-limit replica 256mb 64mb 60. This prevents a single slow replica from overwhelming the backlog.

无效尝试

常见但无效的做法:

  1. 80% 失败

    Setting backlog size to zero disables partial resynchronization, forcing full syncs on each reconnect, increasing network load.

  2. 75% 失败

    Restarting clears the backlog temporarily but does not address the root cause of high write volume or slow replicas.

  3. 50% 失败

    Large keys are not the direct cause; the backlog overflow is due to accumulated write commands, not key size.