[Umbrella] Good First Issues

[jerqi]

Code of Conduct

• I agree to follow this project's Code of Conduct

Search before asking

• I have searched in the issues and found no similar issues.

Describe the proposal

These issues are a great way to get started with a project. Any contribution is important for the Uniffle Commuinity. If the issues have been assigned to others, but there isn't any progress for more than 3 months. You can ask committers or collaborators to assign it to you, too.
The steps of contribution is as below: https://github.com/apache/incubator-uniffle/blob/master/CONTRIBUTING.md

Task list

Code Style Improvements
If you don't read the code of Uniffle but you have some experience about Java. These issues are suitable for you.

• [Improvement] Add a similar util method like ThreadUtils.parmap in the Spark #851
• [Improvement] Make the coordinator client managed by CoordinatorClientFactory singleton #363
• [Umbrella] Use SpotBugs to improve code quality #532

Simple Tasks
If you don't realize the code of Uniffle and want to realize this project by some tasks. These issues are suitable for you.

• [FEATURE] Support hybrid shuffle manager #1020
• [Bug] Dynamic remote storage conf invalid #974
• [Improvement] Exit on OutOfMemoryError #460
• [FEATURE] Expose metrics of TOP10 app bytes in one shuffle server #333
• [Improvement] Add a integration test case for Spark with MiniYarnCluster #138
• [Improvement] Support ZSTD in the spark2.x version #313
• [Improvement] Explicitly throw BUFFER_LIMIT_OF_HUGE_PARTITION instead of NO_BUFFER #1119
• [FEATURE] Add labels with disk path for local storage total_localfile_write_data metrics #1108
• [Bug] [TEZ] The container does not exit because shuffleclient is not closed #1157

CI Improvement
If you're not familiar about Uniffle but have some experience about Github Actions. These issues are suitable for you.

• [Improvement] Add kubernetes Integration test CI #1096

Documents
If you don't have much experience about Java and Uniffle but want to contribute to this project. You can try to improve the documents of this project.

• [DOCS] Split the client.md into four documents #1094

Are you willing to submit PR?

• Yes I am willing to submit a PR!