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Posted to dev@nemo.apache.org by GitBox <gi...@apache.org> on 2018/10/30 10:00:19 UTC

[GitHub] johnyangk opened a new pull request #138: [NEMO-237] Refactor ParentTaskDataFetcher to emit streaming data and watermark

johnyangk opened a new pull request #138: [NEMO-237] Refactor ParentTaskDataFetcher to emit streaming data and watermark
URL: https://github.com/apache/incubator-nemo/pull/138
 
 
   JIRA: [NEMO-237: Refactor ParentTaskDataFetcher to emit streaming data and watermark](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-237)
   
   **Major changes:**
   - Introduces `MultiThreadParentTaskDataFetcher` that does not block, and consumes N iterables concurrently
   - Make 'Pipe' edges use `MultiThreadParentTaskDataFetcher`
   
   **Minor changes to note:**
   - Fixs bugs in TaskExecutor polling logic (thanks to @taegeonum)
   
   **Tests for the changes:**
   - Streaming tests `WindowedWordCountITCase` use the added `MultiThreadParentTaskDataFetcher`
   
   **Other comments:**
   - Will handle watermarks in a different PR (after the OutputWriters are fixed)
   
   Closes #GITHUB_PR_NUMBER
   

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