Piotr Nowojski created FLINK-13013:
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             Summary: Make sure that SingleInputGate can always request 
partitions
                 Key: FLINK-13013
                 URL: https://issues.apache.org/jira/browse/FLINK-13013
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Network
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski


Currently {{SingleInputGate}} requests partitions only on the first attempt to 
fetch the data. Before requesting partitions, no data availability 
notifications can get through. This doesn't work well with a new non blocking 
{{InputGate}} interface, since on newly created {{SingleInputGates,}} 
{{InputGate#isAvailable()}} might return not available, and it will be only 
able to switch to available, after first call to {{SingleInputGate#pollNext()}}.



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