sv2000 opened a new pull request #2928: GOBBLIN-1087: Track and report histogram of observed lag from Gobblin… URL: https://github.com/apache/incubator-gobblin/pull/2928 … Kafka pipeline Dear Gobblin maintainers, Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below! ### JIRA - [x] My PR addresses the following [Gobblin JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR" - https://issues.apache.org/jira/browse/GOBBLIN-1087 ### Description - [x] Here are some details about my PR, including screenshots (if applicable): In this PR, we instrument the KafkaExtractor to track the observed latency of Kafka consumer records processed by the pipeline. Here, observed latency is measured as the time difference between processing time of the record and the original creation time. The latency distribution is tracked in an HdrHistogram, which is serialized into a string when emitted as part of a GobblinTrackingEvent. ### Tests - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: Added unit tests and a JMH benchmarking test. ### Commits - [x] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 2. Subject is limited to 50 characters 3. Subject does not end with a period 4. Subject uses the imperative mood ("add", not "adding") 5. Body wraps at 72 characters 6. Body explains "what" and "why", not "how"
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