WriteConflict error with MongoDB
Problem
Bug description lib/prisma.js - [code block] Using MongoDB free atlas tier, just created database and just connected but getting an error named `WriteConflict` [code block] Last logs [code block] How to reproduce Expected behavior Must create an row with type:`TOTAL_MESSAGES`. Prisma information [code block] an basic event that explains all my code. [code block] Environment & setup - OS: Windows11 64 bit - Database: MongoDB - Node.js version: 16.14.0 Prisma Version [code block]
Error Output
error named `WriteConflict`
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1 Fix
Resolve WriteConflict Error in MongoDB with Prisma
The WriteConflict error occurs when multiple operations attempt to modify the same document or collection concurrently in MongoDB. This is common in environments with high contention, such as when using the free tier of MongoDB Atlas, which has limitations on write operations and may lead to conflicts.
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- 1
Implement Retry Logic
Wrap your write operations in a retry mechanism to handle WriteConflict errors gracefully. This allows your application to attempt the write operation again after a brief delay.
typescriptasync function writeWithRetry(data) { const maxRetries = 5; let attempts = 0; while (attempts < maxRetries) { try { await prisma.yourModel.create({ data }); break; // Exit loop if successful } catch (error) { if (error.code === 'P2002' || error.message.includes('WriteConflict')) { attempts++; await new Promise(resolve => setTimeout(resolve, 100 * attempts)); // Exponential backoff } else { throw error; // Rethrow non-retryable errors } } } } - 2
Optimize Write Operations
Reduce the frequency of write operations by batching them or consolidating data updates where possible. This minimizes the chances of WriteConflict errors occurring.
typescriptconst batchData = [/* array of data to insert */]; await prisma.yourModel.createMany({ data: batchData }); - 3
Check Indexes
Ensure that your MongoDB collections are properly indexed. Missing indexes can lead to performance issues and increased chances of WriteConflict errors. Use the MongoDB Atlas UI to review and create necessary indexes.
javascriptdb.yourCollection.createIndex({ fieldName: 1 }); - 4
Monitor Database Performance
Use MongoDB Atlas monitoring tools to observe the performance of your database. Look for high write contention and adjust your application logic or database schema accordingly.
noneCheck the Performance Advisor in MongoDB Atlas dashboard.
Validation
To confirm the fix worked, monitor the application logs for WriteConflict errors after implementing the retry logic and optimizations. Additionally, check the database performance metrics in MongoDB Atlas to ensure reduced write contention.
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Environment
Submitted by
Alex Chen
2450 rep