d0f635e3bc
### What changes were proposed in this pull request? There are scenarios where Spark History Server is located behind the VPC. So whenever api calls hit to get the executor Summary(allexecutors). There can be delay in getting the response of executor summary and in mean time "stage-page-template.html" is loaded and the response of executor Summary is not added to the stage-page-template.html. As the result of which Aggregated Metrics by Executor in stage page is showing blank. This scenario can be easily found in the cases when there is some proxy-server which is responsible for sending the request and response to spark History server. This can be reproduced in Knox/In-house proxy servers which are used to send and receive response to Spark History Server. Alternative scenario to test this case, Open the spark UI in developer mode in browser add some breakpoint in stagepage.js, this will add some delay in getting the response and now if we check the spark UI for stage Aggregated Metrics by Executor in stage page is showing blank. So In-order to fix this there is a need to add the change in stagepage.js . There is a need to add the api call to get the html page(stage-page-template.html) first and after that other api calls to get the data that needs to attached in the stagepage (like executor Summary, stageExecutorSummaryInfoKeys exc) ### Why are the changes needed? Since stage page is useful for debugging purpose, This helps in understanding how many task ran on the particular executor and information related to shuffle read and write on that executor. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Manually tested. Testing this in a reproducible way requires a running browser or HTML rendering engine that executes the JavaScript.Open the spark UI in developer mode in browser add some breakpoint in stagepage.js, this will add some delay in getting the response and now if we check the spark UI for stage Aggregated Metrics by Executor in stage page is showing blank. Before fix <img width="1529" alt="Screenshot 2020-01-20 at 3 21 55 PM" src="https://user-images.githubusercontent.com/34540906/72716739-bcfd3500-3b98-11ea-8dbe-90a135822f92.png"> After fix <img width="1540" alt="Screenshot 2020-01-20 at 3 23 12 PM" src="https://user-images.githubusercontent.com/34540906/72716782-d30af580-3b98-11ea-8764-2bde77764604.png"> Closes #27292 from SaurabhChawla100/SPARK-30582. Authored-by: Saurabh Chawla <saurabhc@qubole.com> Signed-off-by: Sean Owen <srowen@gmail.com> |
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