Error
Error Code:
138
MongoDB Error 138: Replication Oplog Stale
Description
Error 138, 'Remote Oplog Stale', indicates that a MongoDB replica set member (typically a secondary) cannot find a required operation in its source's oplog. This usually happens because the source's oplog has advanced too far and overwritten the necessary entry, preventing the member from replicating data and staying in sync.
Error Message
Remote Oplog Stale
Known Causes
4 known causesSignificant Replication Lag
A replica set member has fallen too far behind its source, causing the needed oplog entry to be overwritten on the primary.
Inadequate Oplog Size
The configured oplog size is too small relative to the write volume or the expected maximum replication lag, leading to rapid oplog rollover.
Prolonged Member Disconnection
A replica set member was offline or unreachable for an extended period, causing it to fall critically behind the primary's oplog.
High Write Load
Periods of intense write activity can cause the oplog to fill and overwrite entries faster than slower secondaries can process them.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service