Writer should record number of events and bytes unacknowledged

[claudiofahey]

No description provided.

[kmgowda]

This have shared int implementation for multi thread cause the sync issues and in turn reduces the strength of tool to pump more data to pravega client.

[claudiofahey]

FYI I have a branch that implements this.
I will create a PR shortly.
https://github.com/claudiofahey/pravega-benchmark/tree/issue-56-track-unacked

[kmgowda]

include me @kmgowda as reviewer

[claudiofahey]

I created PR #59. I do not have access to add you as a reviewer. Can you add me to this repo?

[RaulGracia]

@claudiofahey are you still interested on submitting the PR for this issue?

[claudiofahey]

Yes but I don't know when I'll have time to finish this. If this is needed soon, it would be better for somebody else to pick this up. My original solution to this is at 163da48.