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https://issues.apache.org/jira/browse/KAFKA-12696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17326051#comment-17326051
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Mikhail Panchenko commented on KAFKA-12696:
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PR: https://github.com/apache/kafka/pull/10569
> Add standard getters to LagInfo class to allow automatic serialization
> ----------------------------------------------------------------------
>
> Key: KAFKA-12696
> URL: https://issues.apache.org/jira/browse/KAFKA-12696
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Mikhail Panchenko
> Priority: Trivial
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> The LagInfo class has non-standard getters for its member variables. This
> means that Jackson and other serialization frameworks do not know how to
> serialize them without additional annotations. So when implementing the sort
> of system that KAFKA-6144 is meant to enable, as documented here in docs like
> [Kafka Streams Interactive
> Queries|https://docs.confluent.io/platform/current/streams/developer-guide/interactive-queries.html#querying-state-stores-during-a-rebalance],
> one has to either inject a bunch of custom serialization logic into Jersey
> or wrap this class.
> The patch to fix this is trivial, and I will be putting one up shortly.
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