[jira] [Created] (FLINK-14214) Performance regression in TwoInputStreamOperator

["Piotr Nowojski (Jira)" <ji...@apache.org>]

Piotr Nowojski created FLINK-14214:
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             Summary: Performance regression in TwoInputStreamOperator
                 Key: FLINK-14214
                 URL: https://issues.apache.org/jira/browse/FLINK-14214
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Task
    Affects Versions: 1.10.0
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski


https://issues.apache.org/jira/browse/FLINK-13051 introduced a performance regression visible for example [here|http://codespeed.dak8s.net:8000/timeline/#/?exe=1,3&ben=twoInputMapSink&env=2&revs=200&equid=off&quarts=off&extr=off] as a drop on August 30th. 

Probable suspect is the following {{.isDone()}} check executed inside {{StreamTwoInputProcessor}} once per record:


{code:java}
// to avoid starvation, if the input selection is ALL and availableInputsMask is not ALL,
// always try to check and set the availability of another input
// TODO: because this can be a costly operation (checking volatile inside CompletableFuture`
//  this might be optimized to only check once per processed NetworkBuffer
if (inputSelectionHandler.shouldSetAvailableForAnotherInput()) {
	checkAndSetAvailable(1 - readingInputIndex);
}
{code}




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