I experienced some performance issues with the logstash-output-google_pubsub plugin. I believe I figured out the issue and created a PR at https://github.com/logstash-plugins/logstash-output-google_pubsub/pull/18 with a potential fix.
I wanted to ask to see if anyone was able to take a look at that PR. And if my hypothesis is correct. I'm not too familiar with jruby so I'm not sure if the PR is correct. But I do have perf tests and my local testing show a huge perf improvement.