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https://issues.apache.org/jira/browse/FLINK-32619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17744413#comment-17744413
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Matt Wang commented on FLINK-32619:
-----------------------------------
hi, i saw flink has supported this, like this:
{code:java}
/** Timeout for identifying inactive slots. */
@Documentation.Section(Documentation.Sections.ALL_TASK_MANAGER)
public static final ConfigOption<Duration> SLOT_TIMEOUT =
key("taskmanager.slot.timeout")
.durationType()
.defaultValue(AkkaOptions.ASK_TIMEOUT_DURATION.defaultValue())
.withFallbackKeys(AkkaOptions.ASK_TIMEOUT_DURATION.key())
.withDescription(
Description.builder()
.text(
"Timeout used for identifying inactive
slots. The TaskManager will free the slot if it does not become active "
+ "within the given amount of
time. Inactive slots can be caused by an out-dated slot request. If no "
+ "value is configured, then it
will fall back to %s.",
code(AkkaOptions.ASK_TIMEOUT_DURATION.key()))
.build()); {code}
> ConfigOptions to support fallback configuration
> -----------------------------------------------
>
> Key: FLINK-32619
> URL: https://issues.apache.org/jira/browse/FLINK-32619
> Project: Flink
> Issue Type: Technical Debt
> Components: Runtime / Configuration
> Affects Versions: 1.16.2, 1.17.1
> Reporter: Hong Liang Teoh
> Priority: Minor
>
> ConfigOptions has no option to specify a "fallback configuration" as the
> default.
>
> For example, if we want {{rest.cache.checkpoint-statistics.timeout}} to
> fallback to web.refresh-interval instead of a static default value, we have
> to specify
>
> {code:java}
> @Documentation.OverrideDefault("web.refresh-interval")
> @Documentation.Section(Documentation.Sections.EXPERT_REST)
> public static final ConfigOption<Duration>
> CACHE_CHECKPOINT_STATISTICS_TIMEOUT =
> key("rest.cache.checkpoint-statistics.timeout")
> .durationType()
> .noDefaultValue()
> .withDescription(
> "....");
> {code}
>
>
> The {{.noDefault()}} is misleading as it actually has a default.
>
> We should introduce a {{.fallbackConfiguration()}} that is handled gracefully
> by doc generators.
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