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https://issues.apache.org/jira/browse/KAFKA-12696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17325947#comment-17325947
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Mikhail Panchenko commented on KAFKA-12696:
-------------------------------------------

The [contributing 
docs|https://cwiki.apache.org/confluence/display/KAFKA/Contributing+Code+Changes]
 say to assign the issue to yourself, but that does not appear possible. I do 
intend to provide this very simple patch :)

> 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: 5m
>  Remaining Estimate: 5m
>
> 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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