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From liuxinchun <liuxinc...@huawei.com>
Subject 答复: [jira] [Created] (FLINK-5250) Make AbstractUdfStreamOperator aware of WrappingFunction
Date Mon, 05 Dec 2016 02:03:44 GMT
Where can I find the usage of CheckpointedFunction? And I found the ckeckpoint problem in the
following issue:


发件人: Aljoscha Krettek (JIRA) [mailto:jira@apache.org] 
发送时间: 2016年12月5日 8:11
收件人: dev@flink.apache.org
主题: [jira] [Created] (FLINK-5250) Make AbstractUdfStreamOperator aware of WrappingFunction

Aljoscha Krettek created FLINK-5250:

             Summary: Make AbstractUdfStreamOperator aware of WrappingFunction
                 Key: FLINK-5250
                 URL: https://issues.apache.org/jira/browse/FLINK-5250
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek

Right now, when using a {{WrappingFunction}}, as happens for {{WindowFunction}} and also for
some functions in the Scala API then using custom interfaces is not possible. These custom
interfaces are, for example, the checkpointing functions such as {{ListCheckpointed}} and

We should teach {{AbstractUdfStreamOperator}} about {{WrapingFunction}} so that it can correctly
handle the case where wrapped user functions implement on of these interfaces.

Also, in the Scala API we have some custom functions that mimic {{WrappingFunction}} behaviour.
These should be moved to use {{WrappingFunction}}, if possible.

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