When using mongodb-driver-core:4.6.1 with ReactiveMongoTemplate occurs Out of memory Java Heap Space

[swh624083440_N_A]

Hi,

When I use mongodb-driver-core 4.6.1 in the springboot application and ReactiveMongoTemplate is used to access the Mongo database, Out of memory Java Heap Space appears in the production environment. After exporting the dump file, use the MAT tool to analyze the file, as shown in the following figure.

It’s similar to the following problem:

Out of memory: Java Heap Space with mongodb-driver-core:4.6.1 with ReactiveMongoTemplate

It’s hard to tell. The only possibly relevant change I’m aware of is in the 4.0 upgrade notes: The connection pool no longer enforces any restrictions on the size of the wait queue of threads or asynchronous tasks that require a connection to MongoDB. It is up to the application to throttle requests sufficiently rather than rely on the driver to throw a MongoWaitQueueFullException. But if you weren’t getting any MongoWaitQueueFullException exceptions thrown from the 3.12 driver then that’s …

I’d like to know if this is a bug in AsyncWorkManager or if the springboot application needs to control the number of queues by itself. Is there a recommended configuration?

Please help me. Thank you very much.

[swh624083440_N_A]

Please help me. Thank you very much.