[jira] [Commented] (SPARK-31621) Spark Master UI Fails to load if application is waiting for workers to launch driver

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-31621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17097305#comment-17097305 ] 

Apache Spark commented on SPARK-31621:
--------------------------------------

User 'akshatb1' has created a pull request for this issue:
https://github.com/apache/spark/pull/28429

> Spark Master UI Fails to load if application is waiting for workers to launch driver
> ------------------------------------------------------------------------------------
>
>                 Key: SPARK-31621
>                 URL: https://issues.apache.org/jira/browse/SPARK-31621
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core, Web UI
>    Affects Versions: 3.0.0
>            Reporter: Akshat Bordia
>            Priority: Major
>         Attachments: SparkMasterError.png
>
>
> *Steps to Reproduce:*
>  # Run Spark Master and 1 Worker (Using local machine).
>  # Submit an (long-running) application using spark-submit command: ./bin/spark-submit --master spark://127.0.0.1:7077  --deploy-mode cluster --class org.apache.spark.examples.SparkPi examples/target/original-spark-examples_2.12-3.1.0-SNAPSHOT.jar
>  # Load Spark Master UI ([http://localhost:8080/]) which should launch successfully.
>  # Submit one more application using the spark-submit command.
>  # Load Spark Master UI again.
> *Expected Behavior:* Spark Master UI should launch successfully.
> *Actual Behavior*: Spark Master UI launch fails with HTTP Error 500 as shown in the below screenshot.
> !SparkMasterError.png|width=530,height=411!



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