OutOfMemofy - Java grpc bi-directional streamming

[Quyen Pham Ngoc]

Dear all, 

I get OutOfMemory error when using grpc multi-directional streamming. When checking the heap dump, I see many instances of io.netty.channel.ChannelOutboundBuffer.

Previously, we thought the reason was due to not ensuring Thread-safety for each request to StreamObserver. We have ensured thread-safety for every request to StreamObserver. But it seems the OOM error still hasn't been fixed. Our app is still crashing after a few days of running. 

I wonder if there are any cases that can cause such an OutOfMemoy phenomenon? Is there any way to fix this OOM error?

Thank you for your help.

[sanjay...@google.com]

Can you include logs, stack-traces etc before the OOM occurs?