dongjoon-hyun edited a comment on pull request #30059:
URL: https://github.com/apache/spark/pull/30059#issuecomment-709624882


   Ur, why do you think like that, @viirya ? Our plan is 
[here](https://github.com/apache/spark/pull/30059#issuecomment-709555763).
   
   1. If you are saying about `repo` or `branch`. The project contributors can 
change PySpark job inside Apache Spark repo in the future. It's the same cost 
like changing `branch-2.4` or `branch-3.0`. And, it's easier than changing 
`spark-website`. 
       > As the pre-built image cannot be easily changed like modifying 
workflow yml file, the project contributors might be a bit harder to change 
Github Action PySpark job.
   
   2. If you are saying about `Dockerfile`, we already have 7 `Dockerfile` 
which is open for contributor. It consists of easy linux commands.
   ```
   $ find . -name Dockerfile
   ./resource-managers/kubernetes/docker/src/main/dockerfiles/spark/Dockerfile
   
./resource-managers/kubernetes/docker/src/main/dockerfiles/spark/bindings/python/Dockerfile
   
./resource-managers/kubernetes/docker/src/main/dockerfiles/spark/bindings/R/Dockerfile
   ./dev/create-release/spark-rm/Dockerfile
   ./external/docker/spark-test/master/Dockerfile
   ./external/docker/spark-test/worker/Dockerfile
   ./external/docker/spark-test/base/Dockerfile
   ```
   
   BTW, I want to focus on the improvement which we can get. As you know, I 
tried various approach in the following PR already, but nothing is better than 
this. This PR reduces from `3 hours 14 minutes` to `2 hours 23 minutes`.
   - https://github.com/apache/spark/pull/30012


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