tashoyan opened a new pull request #17704:
URL: https://github.com/apache/flink/pull/17704
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## What is the purpose of the change
This PR allows for a Flink application without fat-jar. Fat-jars have severe
disadvantages:
- huge jars with duplicated classes - no code sharing via libraries
- impossible to see on runtime the actually used dependencies and their
versions
With this change, it will be possible to deliver a Flink application in a
normal jar accompanied with jars of dependencies
## Brief change log
Introduce a customizable environment variable `FLINK_CLIENT_ADD_CLASSPATH`.
The classpath of the `flink` command-line client now includes the value of
`FLINK_CLIENT_ADD_CLASSPATH`.
## Verifying this change
*(Please pick either of the following options)*
Manual test is here:
[flink-yarn-no-fatjar](https://github.com/tashoyan/flink-yarn-no-fatjar).
The test runs successfully on a YARN cluster.
Unfortunately I could not make an automated test. I tried to introduce this
test:
[test_yarn_job_no_fatjar_docker.sh](https://github.com/tashoyan/flink-mirror/blob/FLINK-23972-flink-client-classpath/flink-end-to-end-tests/test-scripts/test_yarn_job_no_fatjar_docker.sh).
Problems:
- The YARN cluster inside docker containers does not work for me - neither
locally, nor in Azure Pipelines. Somehow the Resource Manager becomes
inaccessible.
- All tests related to S3 do not work for me, because I do not have S3
credentials.
After few fruitless attempts to make this test running, I simply extracted
the code to a separate GitHub repository
[flink-yarn-no-fatjar](https://github.com/tashoyan/flink-yarn-no-fatjar) and
verified it manually.
## Does this pull request potentially affect one of the following parts:
- Dependencies: no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? yes
- If yes, how is the feature documented? not documented
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