[jira] [Updated] (FLINK-5509) Replace QueryableStateClient keyHashCode argument

["Kostas Kloudas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kostas Kloudas updated FLINK-5509:
----------------------------------
    Fix Version/s: 1.4.0

> Replace QueryableStateClient keyHashCode argument
> -------------------------------------------------
>
>                 Key: FLINK-5509
>                 URL: https://issues.apache.org/jira/browse/FLINK-5509
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Queryable State
>            Reporter: Ufuk Celebi
>            Assignee: Kostas Kloudas
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> When going over the low level QueryableStateClient with [~NicoK] we noticed that the key hashCode argument can be confusing to users:
> {code}
> Future<byte[]> getKvState(
>   JobID jobId,
>   String name,
>   int keyHashCode,
>   byte[] serializedKeyAndNamespace)
> {code}
> The {{keyHashCode}} argument is the result of calling {{hashCode()}} on the key to look up. This is what is send to the JobManager in order to look up the location of the key. While pretty straight forward, it is repetitive and possibly confusing.
> As an alternative we suggest to make the method generic and simply call hashCode on the object ourselves. This way the user just provides the key object.
> Since there are some early users of the queryable state API already, we would suggest to rename the method in order to provoke a compilation error after upgrading to the actually released 1.2 version.
> (This would also work without renaming since the hashCode of Integer (what users currently provide) is the same number, but it would be confusing why it acutally works.)



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