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Posted to issues@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2014/12/05 17:55:12 UTC

[jira] [Commented] (FLINK-1305) Flink's hadoop compatibility layer cannot handle NullWritables

    [ https://issues.apache.org/jira/browse/FLINK-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235722#comment-14235722 ] 

Stephan Ewen commented on FLINK-1305:
-------------------------------------

How does Hadoop handle this? In many cases, they create a new instance as well (public null-ary constructor) and use that to read the data...

> 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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