ZihanLi58 opened a new pull request #2576: [GOBBLIN-706]enable dynamic mappers URL: https://github.com/apache/incubator-gobblin/pull/2576 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 - [ ] 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-706 ### Description - [ ] Here are some details about my PR, including screenshots (if applicable): Today the number of mappers is hard coded and almost always reached, however, many mappers do very little work. This tends to cause small files and short jobs that are overhead dominated. The improvement here is to enable user add a job property named target.mapper.size to set the target mapper size and Gobblin will dynamically scale the number of mappers up and down depending on the total load. If the property is not set, the number of mappers will still be the vale of mr.job.max.mappers. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: ### Commits - [ ] 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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