taegeonum opened a new pull request #137: [NEMO-232] Implement InputWatermarkManager URL: https://github.com/apache/incubator-nemo/pull/137 JIRA: [NEMO-232: Implement InputWatermarkManager](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-232) **Major changes:** - Tracks the minimum watermark among multiple input streams by creating `InputWatermarkManager` - Emits watermarks from `OutputCollector` to `InputWatermarkManager`. Then `InputWatermarkManager` emits the minimum input watermarks to next operators **Minor changes to note:** - Create `NextOperatorInfo` to wrap edge index, OperatorVertex, and InputWatermarkManager. **Tests for the changes:** - Create `InputWatermarkManagerTest` - Add `testMultipleIncomingEdges` to `TaskExecutorTest` **Other comments:** - Closes #GITHUB_PR_NUMBER
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