Status

Current state: Under DiscussionRejected

Discussion thread: here (<- link to https://mail-archiveslists.apache.org/thread/n8omkpjf1mk9jphx38b8tfrs4h3nxo3zmod_mbox/flink-dev/)

JIRA:

...

Here is the table of the corresponding native levels of all the supported logging implementations.

Limitations

TBD

Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?
• If we are changing behavior how will we phase out the older behavior?
• If we need special migration tools, describe them here.
• When will we remove the existing behavior?

Test Plan

Describe in few sentences how the FLIP will be tested. We are mostly interested in system tests (since unit-tests are specific to implementation details). How will we know that the implementation works as expected? How will we know nothing broke?

Rejected Alternatives

Considered to be an MVP (Minimal Viable Product), this improvement does not support the features, such as defining the scope (e.g. job manager or task manager only) and a timer. The log levels of the target logger are going to be changed cluster-wide, on the job manager leader and all the currently-registered task managers. To unset the previously-changed level, pass a null log-level argument.

Another limitation is that changing the log levels is not considered to be a persistent operation for simplicity. Without storing the log settings into a HighAvailabilityService, it is also impossible to change the log level on a follower job manager. If a task manager is (re-)joined or a standby job manager becomes the leader, the log levels on these processes remain unchanged and only will be changed upon the next call.

Compatibility, Deprecation, and Migration Plan

It does not affect any compatibility or have any deprecation or migration.

Test Plan

Besides unit tests, system tests will be included to cover the cases where different logging providers are used or no logging provider is enabled.

Rejected Alternatives

N/AIf there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.