igozali opened a new pull request #25910: [SPARK-28762][CORE] Read JAR main class if JAR is not located in local file system URL: https://github.com/apache/spark/pull/25910 <!-- 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. --> ### 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. --> JIRA: https://issues.apache.org/jira/browse/SPARK-28762 TL;DR: Automatically read the `Main-Class` from a JAR's manifest even if the JAR isn't in the local file system (i.e. in S3 or HDFS). ### 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. --> When deploying a fat JAR (e.g. using `sbt-assembly`) to S3/HDFS, users might choose to include the main class for the JAR in its manifest. This change allows the user to `spark-submit` the JAR without having to specify the main class again via the `--class` argument. ### 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. Previously, if the primary resource is a JAR and isn't located in the local file system, it will fail with the error: ``` $ spark-submit s3a://nonexistent.jar Exception in thread "main" org.apache.spark.SparkException: Cannot load main class from JAR s3a://nonexistent.jar with URI s3a. Please specify a class through --class. ... ``` With this PR, the main class will be read from the manifest, assuming the classpath contains the appropriate JAR to read the file system. ### 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. --> Added some tests in `core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala`.
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