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https://issues.apache.org/jira/browse/SPARK-31621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves resolved SPARK-31621.
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Fix Version/s: 3.1.0
3.0.0
Resolution: Fixed
> 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
> Fix For: 3.0.0, 3.1.0
>
> 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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