mongodb runtime_error ai_generated true

MongoServerError: 均衡器轮次迁移失败：命名空间 mydb.mycoll 的块迁移失败

MongoServerError: balancer round migration failed: chunk migration failed for namespace mydb.mycoll

ID: mongodb/balancer-round-migration-failure

其他格式: JSON · Markdown 中文 · English
85%修复率
88%置信度
1证据数
2023-11-15首次发现

版本兼容性

版本状态引入弃用备注
MongoDB 7.0 active — — —
MongoDB 6.0 active — — —
MongoDB 8.0 (early access) active — — —

根因分析

由于临时网络问题或源/目标分片上的冲突操作，均衡器无法迁移块。

English

The balancer failed to migrate a chunk due to a temporary network issue or a conflicting operation on the source or target shard.

generic

解决方案

  1. Check balancer state and retry migration after resolving any conflicting operations (e.g., long-running queries or index builds). Use sh.status() to monitor balancer activity.
  2. Increase balancer window or reduce chunk size to make migrations more manageable: use sh.setBalancerState(true) and adjust chunk size via sh._setBalancerChunkSize(64) (in MB).
  3. Force chunk migration manually using moveChunk with a specific shard key range and wait for completion: sh.moveChunk('mydb.mycoll', { shardKey: value }, 'targetShard').

无效尝试

常见但无效的做法:

  1. 60% 失败

    moveChunk may fail with same error if underlying issue persists, and can disrupt ongoing migrations.

  2. 70% 失败

    Stopping balancer is a temporary pause, not a fix; the root cause (e.g., network blip) remains.

  3. 50% 失败

    Restart often doesn't resolve underlying connectivity or operation conflicts.