[FLINK-1305] Flink's hadoop compatibility layer cannot handle NullWritables

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.7.0-incubating
• Fix Version/s: 0.8.0
• Component/s: API / DataSet
• Assignee: Robert Metzger
• Reporter: Sebastian Schelter
• Created: 05/Dec/14 16:30
• Updated: 16/Jun/16 17:07
• Resolved: 14/Dec/14 22:27

Description

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.