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https://issues.apache.org/jira/browse/FLINK-34655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17826054#comment-17826054
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Gyula Fora commented on FLINK-34655:
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[~mxm] I would be hesitant to try to backport these changes to 1.15/1.16, the
community doesn't generally backport new features to older releases and also
these are already out of the supported version scope of Flink core anyways.
For 1.15 we would have to backport the aggregated metrics changes which is not
backward compatible with the current 1.15 rest api, so not possible to do.
> Autoscaler doesn't work for flink 1.15
> --------------------------------------
>
> Key: FLINK-34655
> URL: https://issues.apache.org/jira/browse/FLINK-34655
> Project: Flink
> Issue Type: Bug
> Components: Autoscaler
> Reporter: Rui Fan
> Assignee: Rui Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: kubernetes-operator-1.8.0
>
>
> flink-ubernetes-operator is committed to supporting the latest 4 flink minor
> versions, and autoscaler is a part of flink-ubernetes-operator. Currently,
> the latest 4 flink minor versions are 1.15, 1.16, 1.17 and 1.18.
> But autoscaler doesn't work for flink 1.15.
> h2. Root cause:
> * FLINK-28310 added some properties in IOMetricsInfo in flink-1.16
> * IOMetricsInfo is a part of JobDetailsInfo
> * JobDetailsInfo is necessary for autoscaler [1]
> * flink's RestClient doesn't allow miss any property during deserializing the
> json
> That means that the RestClient after 1.15 cannot fetch JobDetailsInfo for
> 1.15 jobs.
> h2. How to fix it properly?
> - [[FLINK-34655](https://issues.apache.org/jira/browse/FLINK-34655)] Copy
> IOMetricsInfo to flink-autoscaler-standalone module
> - Removing them after 1.15 are not supported
> [1]
> https://github.com/apache/flink-kubernetes-operator/blob/ede1a610b3375d31a2e82287eec67ace70c4c8df/flink-autoscaler/src/main/java/org/apache/flink/autoscaler/ScalingMetricCollector.java#L109
> [2]
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-401%3A+REST+API+JSON+response+deserialization+unknown+field+tolerance
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