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https://issues.apache.org/jira/browse/FLINK-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14237305#comment-14237305
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ASF GitHub Bot commented on FLINK-1305:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/252#issuecomment-65959720
This change adds hadoop as a hard dependency to the `flink-java` project.
Per the discussion on the mailing list, concerning support for Hadoop
Writables, we voted to not do that and instead add an "mimick interface" to the
Java API.
For a big change like reversing that, it would be good to have some
reasons...
> Flink's hadoop compatibility layer cannot handle NullWritables
> --------------------------------------------------------------
>
> Key: FLINK-1305
> URL: https://issues.apache.org/jira/browse/FLINK-1305
> Project: Flink
> Issue Type: Bug
> Components: Hadoop Compatibility
> Affects Versions: 0.7.0-incubating
> Reporter: Sebastian Schelter
> Assignee: Robert Metzger
> Priority: Critical
>
> NullWritable is a special object that is commonly used in Hadoop
> applications. NullWritable does not provide a public constructor, but only a
> singleton factory method. Therefore Flink fails when users to try to read
> NullWritables from Hadoop sequencefiles.
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