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https://issues.apache.org/jira/browse/FLINK-2098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567848#comment-14567848
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ASF GitHub Bot commented on FLINK-2098:
---------------------------------------

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

    https://github.com/apache/flink/pull/742#discussion_r31460503
  
    --- Diff: 
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/functions/source/SourceFunction.java
 ---
    @@ -19,66 +19,81 @@
     package org.apache.flink.streaming.api.functions.source;
     
     import org.apache.flink.api.common.functions.Function;
    +import org.apache.flink.util.Collector;
     
     import java.io.Serializable;
     
     /**
      * Base interface for all stream data sources in Flink. The contract of a 
stream source
    - * is similar to an iterator - it is consumed as in the following pseudo 
code:
    --- End diff --
    
    Maybe streaming data sources, instead of stream data sources. Not to 
confuse with file streams are intermediate results.


> Checkpoint barrier initiation at source is not aligned with snapshotting
> ------------------------------------------------------------------------
>
>                 Key: FLINK-2098
>                 URL: https://issues.apache.org/jira/browse/FLINK-2098
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 0.9
>            Reporter: Stephan Ewen
>            Assignee: Aljoscha Krettek
>            Priority: Blocker
>             Fix For: 0.9
>
>
> The stream source does not properly align the emission of checkpoint barriers 
> with the drawing of snapshots.



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