sarutak opened a new pull request #27837: [SPARK-31073][WEBUI] Add "shuffle write time" to task metrics summary in StagePage. URL: https://github.com/apache/spark/pull/27837 <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, please read our contributor guidelines: https://spark.apache.org/contributing.html 2. Ensure you have added or run the appropriate tests for your PR: https://spark.apache.org/developer-tools.html 3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][SPARK-XXXX] Your PR title ...'. 4. Be sure to keep the PR description updated to reflect all changes. 5. Please write your PR title to summarize what this PR proposes. 6. If possible, provide a concise example to reproduce the issue for a faster review. 7. If you want to add a new configuration, please read the guideline first for naming configurations in 'core/src/main/scala/org/apache/spark/internal/config/ConfigEntry.scala'. --> ### What changes were proposed in this pull request? <!-- Please clarify what changes you are proposing. The purpose of this section is to outline the changes and how this PR fixes the issue. If possible, please consider writing useful notes for better and faster reviews in your PR. See the examples below. 1. If you refactor some codes with changing classes, showing the class hierarchy will help reviewers. 2. If you fix some SQL features, you can provide some references of other DBMSes. 3. If there is design documentation, please add the link. 4. If there is a discussion in the mailing list, please add the link. --> I've applied following changed to StagePage. 1. Added `Shuffle Write Time` to task metrics summary. 2. Added checkbox for `Shuffle Write Time` as an additional metrics. 3. Renamed `Write Time` column in task table to `Shuffle Write Time` and let it as an additional column. ### Why are the changes needed? <!-- Please clarify why the changes are needed. For instance, 1. If you propose a new API, clarify the use case for a new API. 2. If you fix a bug, you can clarify why it is a bug. --> Task metrics summary doesn't show `Shuffle Write Time` even though it shows `Shuffle Read Blocked Time`. `Shuffle Read Blocked Time` is let as an additional metrics so I also let `Shuffle Write Time` as an other additional metrics. ### Does this PR introduce any user-facing change? <!-- If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible. If no, write 'No'. --> Yes. After this change, task metrics summary can show `Shuffle Write Time` and its visibility is controlled by a checkbox.   `Write Time` column is already shown in task table but the title is ambiguous so I've renamed it as `Shuffle Write Time`. After this change, this column is also additional column like `Shuffle Read Blocked Time`.  ### How was this patch tested? <!-- If tests were added, say they were added here. Please make sure to add some test cases that check the changes thoroughly including negative and positive cases if possible. If it was tested in a way different from regular unit tests, please clarify how you tested step by step, ideally copy and paste-able, so that other reviewers can test and check, and descendants can verify in the future. If tests were not added, please describe why they were not added and/or why it was difficult to add. --> I've tested manually using following code and confirm the UI. `sc.parallelize(1 to 1000).map(x => (x,x)).reduceByKey(_+_).collect`
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