[FLINK-20911][state-backend-rocksdb] Support configuration of RocksDB log level

[1996fanrui]

What is the purpose of the change

Support configuration of RocksDB log level

Brief change log

• add config state.backend.rocksdb.log.level

Verifying this change

This change added tests and can be verified as follows:

• Check whether the configuration takes effect

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): 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/Mesos, 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? docs

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Automated Checks

Last check on commit 926ffcf (Fri May 28 07:08:04 UTC 2021)

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• ❓ 1. The [description] looks good.
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CI report:

• 926ffcf Azure: SUCCESS

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[Myasuka]

The CI is broken due to bad format, please refactor this PR.

[Myasuka]

I think we could remove this line as it add description of so Flink sets the RocksDB log level to HEADER_LEVEL by default.

[1996fanrui]

@Myasuka Thanks for your review. I have removed.

[1996fanrui]

@Myasuka
The configuration of state.backend.rocksdb.log.level has added documentation, but the unit test of the documentation failed. I don't know how to solve it. Can you help me when you are free? Thanks.

link

[Myasuka]

How do you generate the configuration in html?
From the error message, it should be Flink choose 'HEADER_LEVEL' instead of Flink choose HEADER_LEVEL in your PR.

[1996fanrui]

@flinkbot run azure

[Myasuka]

LGTM

[1996fanrui]

@Myasuka Thank you for your help and review.