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https://issues.apache.org/jira/browse/FLINK-7423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Xu Pingyong updated FLINK-7423:
-------------------------------
    Summary: Always reuse an instance  to get elements from the inputFormat   
(was: Always reuse an instance  to get elements from an inputFormat )

> Always reuse an instance  to get elements from the inputFormat 
> ---------------------------------------------------------------
>
>                 Key: FLINK-7423
>                 URL: https://issues.apache.org/jira/browse/FLINK-7423
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Xu Pingyong
>            Assignee: Xu Pingyong
>
> In InputFormatSourceFunction.java:
> {code:java}
> OUT nextElement = serializer.createInstance();
>                       while (isRunning) {
>                               format.open(splitIterator.next());
>                               // for each element we also check if cancel
>                               // was called by checking the isRunning flag
>                               while (isRunning && !format.reachedEnd()) {
>                                       nextElement = 
> format.nextRecord(nextElement);
>                                       if (nextElement != null) {
>                                               ctx.collect(nextElement);
>                                       } else {
>                                               break;
>                                       }
>                               }
>                               format.close();
>                               completedSplitsCounter.inc();
>                               if (isRunning) {
>                                       isRunning = splitIterator.hasNext();
>                               }
>                       }
> {code}
> the format may return other element or null when nextRecord, that will may 
> cause exception.



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