[jira] [Assigned] (KAFKA-12158) Consider better return type of RaftClient.scheduleAppend

["dengziming (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-12158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dengziming reassigned KAFKA-12158:
----------------------------------

    Assignee: dengziming

> Consider better return type of RaftClient.scheduleAppend
> --------------------------------------------------------
>
>                 Key: KAFKA-12158
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12158
>             Project: Kafka
>          Issue Type: Sub-task
>            Reporter: Jason Gustafson
>            Assignee: dengziming
>            Priority: Major
>
> Currently `RaftClient` has the following Append API:
> {code}
>     Long scheduleAppend(int epoch, List<T> records);
> {code}
> There are a few possible cases that the single return value is trying to handle:
> 1. The epoch doesn't match or we are not the current leader => return Long.MaxValue
> 2. We failed to allocate memory to write the the batch (backpressure case) => return null
> 3. We successfully scheduled the append => return the expected offset
> It might be better to define a richer type so that the cases that must be handled are clearer. At a minimum, it would be better to return `OptionalLong` and get rid of the null case.



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