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

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

    [ https://issues.apache.org/jira/browse/FLINK-26576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17698248#comment-17698248 ] 

Lijie Wang commented on FLINK-26576:
------------------------------------

I closed this ticket as "Won't fix" because the legacy source API was deprecated(FLINK-28045).

> 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
>    Affects Versions: 1.13.6, 1.14.3, 1.15.0
>            Reporter: Lijie Wang
>            Priority: Major
>
> 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 downstream readers is {*}5{*}. This will result in only 1 split being generated, even though there are 5 downstream readers.
> {code:java}
>     @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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