[jira] [Created] (FLINK-26576) The value of 'readerParallelism' passed to ContinuousFileMonitoringFunction is wrong

["Lijie Wang (Jira)" <ji...@apache.org>]

Lijie Wang created FLINK-26576:
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             Summary: The value of 'readerParallelism' passed to ContinuousFileMonitoringFunction is wrong
                 Key: FLINK-26576
                 URL: https://issues.apache.org/jira/browse/FLINK-26576
             Project: Flink
          Issue Type: Bug
          Components: API / DataStream
            Reporter: Lijie Wang


In [StreamExecutionEnvironment#createFileInput |https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.java#:~:text=inputFormat%2C%20monitoringMode%2C-,getParallelism(),-%2C%20interval)%3B], the {{env.getParallelism()}} was passed to {{ContinuousFileMonitoringFunction}} as the parallelism of downstream readers. This value is incorrect when the parallelism of the downstream readers is manually configured by the user.

For example, in the test below, *1* will be passed as {{readerParallelism}}, but the actual parallelism of readers is *5*.

{code:java}
// Some comments here
    @Test
    public void testContinuousFileMonitoringFunction() throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.createLocalEnvironment(1);

        final String fileContent = "line1\n" + "line2\n" + "line3\n" + "line4\n" + "line5\n";

        final File file = createTempFile(fileContent);

        env.readTextFile(file.getPath()).name("TextSource").setParallelism(5)
                .forward()
                .addSink(new PrintSinkFunction<>()).setParallelism(5);

        env.execute();
    }

    private File createTempFile(String content) throws IOException {
        File tempFile = File.createTempFile("test_contents", "tmp");
        tempFile.deleteOnExit();

        OutputStreamWriter wrt =
                new OutputStreamWriter(new FileOutputStream(tempFile), StandardCharsets.UTF_8);
        wrt.write(content);
        wrt.close();

        return tempFile;
    }
{code}



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