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https://issues.apache.org/jira/browse/FLINK-32740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17750916#comment-17750916
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Yao Zhang commented on FLINK-32740:
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Hi [~JunRuiLi],
Good question. It is also my concern.
I searched values in
[Configuration|http://https//nightlies.apache.org/flink/flink-docs-release-1.17/zh/docs/deployment/config/]
and there are no valid values named null(but there are some valid values named
NONE). Some values may contain null (e.g. /dev/null) but they will not be
translated to null. If the user intends to set the value as the string "null",
a slight change is needed by adding double quotes (e.g. some.key: "null").
I also investigate the null literals defined in YAML standard:
* <empty string>
* ~
* null (case sensitive)
Currently we may follow all the standards or only part of them, as the YAML
parser is not used.
> Introduce literal null value for flink-conf.yaml
> ------------------------------------------------
>
> Key: FLINK-32740
> URL: https://issues.apache.org/jira/browse/FLINK-32740
> Project: Flink
> Issue Type: Improvement
> Components: API / Core
> Affects Versions: 1.15.4
> Reporter: Yao Zhang
> Priority: Minor
>
> Hi community,
> Currently in flink-conf.yaml we only consider simplified YAML syntax like key
> value pairs. And it might not be the right timing to indroduce YAML parser.
> As [FLINK-23620 |https://issues.apache.org/jira/browse/FLINK-23620] has been
> stated, there might be some keys that violate the YAML naming conventions.
> The current situation is, if we want to unset the value (or set the value as
> its default), what we could do is to remove the key value pair completely or
> leave the value blank (e.g. `rest.port: `). It might be inconvenient or less
> readable for conf file that controlled by other applications.
> So is it necessary to add some special literal values that will be translated
> to the real null value? For YAML we usually see ~, null or empty value as
> null value. If necessary I would like to do this.
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