[jira] [Created] (FLINK-4316) Make flink-core independent of Hadoop

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-4316:
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             Summary: Make flink-core independent of Hadoop
                 Key: FLINK-4316
                 URL: https://issues.apache.org/jira/browse/FLINK-4316
             Project: Flink
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.2.0


We want to gradually reduce the hard and heavy mandatory dependencies in Hadoop. Hadoop will still be part of (most) flink downloads, but the API projects should not have a hard dependency on Hadoop.

I suggest to start with {{flink-core}}, because it only depends on Hadoop for the {{Writable}} type, to support seamless operation of Hadoop types.

I propose to move all {{WritableTypeInfo}}-related classes to the {{flink-hadoop-compatibility}} project and access them via reflection in the {{TypeExtractor}}.

That way, {{Writable}} types will be out of the box supported if users have the {{flink-hadoop-compatibility}} project in the classpath.



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