[jira] [Created] (FLINK-6323) Add new Sink interface with access to more meta data

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

Aljoscha Krettek created FLINK-6323:
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             Summary: Add new Sink interface with access to more meta data
                 Key: FLINK-6323
                 URL: https://issues.apache.org/jira/browse/FLINK-6323
             Project: Flink
          Issue Type: Improvement
          Components: DataStream API
            Reporter: Aljoscha Krettek


The current {{SinkFunction}} cannot access the timestamps of elements which resulted in the (somewhat hacky) {{FlinkKafkaProducer010}}. Due to other limitations {{GenericWriteAheadSink}} is currently also a {{StreamOperator}} and not a {{SinkFunction}}.

We should add a new interface for sinks that takes a context parameter, similar to {{ProcessFunction}}. This will allow sinks to query additional meta data about the element that they're receiving. 

This is one ML thread where a user ran into a problem caused by this: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Why-I-am-getting-Null-pointer-exception-while-accessing-RuntimeContext-in-FlinkKafkaProducer010-td12633.html#a12635



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