mongodb runtime_error ai_generated true

MongoServerError: change stream namespace not found

ID: mongodb/change-stream-namespace-not-found

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
1Evidence
2023-08-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
mongodb 7.0 active — — —
mongodb 6.0 active — — —
mongodb 5.0 active — — —

Root Cause

The collection or database specified in the change stream pipeline does not exist or was dropped during the stream's lifetime.

generic

中文

变更流管道中指定的集合或数据库不存在，或在流生命周期内被删除。

Official Documentation

https://www.mongodb.com/docs/manual/changeStreams/#change-streams-and-collections

Workarounds

  1. 85% success Verify the collection exists before opening the change stream: db.collection('myColl').exists() then create if missing. 
    Verify the collection exists before opening the change stream: db.collection('myColl').exists() then create if missing.
  2. 75% success Use a try-catch block to recreate the change stream when this error occurs: try { cursor = collection.watch(); } catch (e) { if (e.code === 166) { db.createCollection('myColl'); } } 
    Use a try-catch block to recreate the change stream when this error occurs: try { cursor = collection.watch(); } catch (e) { if (e.code === 166) { db.createCollection('myColl'); } }

中文步骤

  1. 在打开变更流前验证集合是否存在：db.collection('myColl').exists()，如果不存在则创建。
  2. 使用try-catch块在出现此错误时重新创建变更流：try { cursor = collection.watch(); } catch (e) { if (e.code === 166) { db.createCollection('myColl'); } }

Dead Ends

Common approaches that don't work:

  1. 80% fail

    The collection still doesn't exist, so the error persists.

  2. 90% fail

    Batch size does not affect namespace validity; the root cause is missing collection.