We believe the following issue grpc/grpc-java#2358 is affecting the pubsub as we are seeing OOM exceptions.

As gcloud 0.5.0 and 0.7.0 java is hard bundled with GRPC & netty version 4.1.3 it won't work by overriding the netty-all version (reason unknown but it is just quiet...)

Would it be possible to upgrade this dependency or let us know how this dependency can be manually overridden?