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https://issues.apache.org/jira/browse/FLINK-2314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15296357#comment-15296357
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ASF GitHub Bot commented on FLINK-2314:
---------------------------------------

Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2020#discussion_r64221544
  
    --- Diff: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/DataStreamSource.java
 ---
    @@ -44,6 +44,11 @@ public DataStreamSource(StreamExecutionEnvironment 
environment,
                }
        }
     
    +   public DataStreamSource(SingleOutputStreamOperator<T> operator) {
    --- End diff --
    
    Here, we should always set `isParallel` to `true`. It is not quite obvious 
but the field is used to disallow changing the parallelism for a 
`SourceFunction` that cannot be parallelized. Our new operator can always run 
in parallel.


> Make Streaming File Sources Persistent
> --------------------------------------
>
>                 Key: FLINK-2314
>                 URL: https://issues.apache.org/jira/browse/FLINK-2314
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Stephan Ewen
>            Assignee: Kostas Kloudas
>
> Streaming File sources should participate in the checkpointing. They should 
> track the bytes they read from the file and checkpoint it.
> One can look at the sequence generating source function for an example of a 
> checkpointed source.



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