Github user pwendell commented on the pull request: https://github.com/apache/spark/pull/918#issuecomment-62331367 I'd like to close this issue for now and keep the JIRA around. This is a completely reasonable way to accomplish adding custom metrics, but this overlaps a good amount with Accumulators and their display in the UI - which I think is our longer term API for doing things like this. Anyways let's keep this patch and the JIRA around and we can consider it in the future.
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