Error
Error Code:
87
MongoDB Error 87: Chunk Splitting Failure
Description
Error 87, 'Cannot Split', indicates that MongoDB failed to divide a data chunk within a sharded cluster. This typically occurs during automatic chunk balancing or manual chunk operations when the system is unable to find a suitable split point, often due to shard key design or data distribution patterns.
Error Message
Cannot Split
Known Causes
4 known causesIneffective Shard Key Design
The chosen shard key might not allow for effective chunk splitting, such as a monotonically increasing key which concentrates writes and makes finding split points difficult.
Highly Skewed Data Distribution
A specific chunk might contain an overwhelming majority of documents for a particular shard key range, making it difficult for the balancer to find a balanced split point.
Minimum Chunk Size Constraints
The chunk might already be too small or near the minimum acceptable size, preventing further division by the balancer.
Concurrent Operations or Resource Contention
High load or other intensive operations on the cluster can interfere with the chunk splitting process, leading to temporary failures.
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