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https://issues.apache.org/jira/browse/FLINK-2462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699182#comment-14699182
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ASF GitHub Bot commented on FLINK-2462:
---------------------------------------

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

    https://github.com/apache/flink/pull/1017#discussion_r37167205
  
    --- Diff: 
flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/operators/Output.java
 ---
    @@ -33,9 +33,8 @@
         * Emits a {@link Watermark} from an operator. This watermark is 
broadcast to all downstream
         * operators.
         *
    -    * <p>
    -    * A watermark specifies that no element with a timestamp older or 
equal to the watermark
    -    * timestamp will be emitted in the future.
    +    * <p>A watermark specifies that no element with a timestamp older or 
equal to the watermark
    --- End diff --
    
    Why did you change this? The oracle Javadoc literature 
(http://www.oracle.com/technetwork/articles/java/index-137868.html) and style 
guides (http://blog.joda.org/2012/11/javadoc-coding-standards.html) have it 
like it was. Javadoc is not HTML so tags like <li> <p> and so on are not closed.


> Wrong exception reporting in streaming jobs
> -------------------------------------------
>
>                 Key: FLINK-2462
>                 URL: https://issues.apache.org/jira/browse/FLINK-2462
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 0.10
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>            Priority: Blocker
>             Fix For: 0.10
>
>
> When streaming tasks are fail and are canceled, they report a plethora of 
> followup exceptions.
> The batch operators have a clear model that makes sure that root causes are 
> reported, and followup exceptions are not reported. That makes debugging much 
> easier.
> A big part of that is to have a single consistent place that logs exceptions, 
> and that has a view of whether the operation is still running, or whether it 
> has been canceled.



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