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

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

Ufuk Celebi created FLINK-5509:
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             Summary: Replace QueryableStateClient keyHashCode argument
                 Key: FLINK-5509
                 URL: https://issues.apache.org/jira/browse/FLINK-5509
             Project: Flink
          Issue Type: Improvement
          Components: Queryable State
            Reporter: Ufuk Celebi
            Priority: Minor


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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