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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: 3.4.0
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Component/s: Lambda, MongoDB 3.4
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We are experiencing random connection errors in our app when using AWS Lambda. We are experiencing the issues both for Node 10.x and Node 12.x, and are using mongo driver version 3.4.0 with the following settings:
{
useUnifiedTopology: true,
bufferMaxEntries: 0
}
This caused the lambda functions to randomly time out with error code 502.
After changing connectTimeoutMS and socketTimeoutMS to 3000, we got the following error message from the sporadically failing connections.
{
"errorType": "TypeError",
"errorMessage": "Cannot read property 'payload' of null",
"stack": [
"TypeError: Cannot read property 'payload' of null",
" at sendAuthCommand (/var/task/node_modules/mongodb/lib/core/auth/scram.js:244:47)",
" at _callback (/var/task/node_modules/mongodb/lib/core/connection/connect.js:320:5)",
" at Connection.errorHandler (/var/task/node_modules/mongodb/lib/core/connection/connect.js:336:5)",
" at Object.onceWrapper (events.js:286:20)",
" at Connection.emit (events.js:198:13)",
" at Connection.EventEmitter.emit (domain.js:448:20)",
" at TLSSocket.<anonymous> (/var/task/node_modules/mongodb/lib/core/connection/connection.js:353:10)",
" at Object.onceWrapper (events.js:286:20)",
" at TLSSocket.emit (events.js:198:13)",
" at TLSSocket.EventEmitter.emit (domain.js:448:20)"
]
}
We are caching our connection outside the lambda handler according to this blog post:
https://www.mongodb.com/blog/post/optimizing-aws-lambda-performance-with-mongodb-atlas-and-nodejs
Appreciate any help, Kind regards.