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From "Peter Ertl (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (FLINK-7430) ContinuousFileReaderOperator swallows exceptions
Date Fri, 11 Aug 2017 11:21:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123207#comment-16123207
] 

Peter Ertl edited comment on FLINK-7430 at 8/11/17 11:20 AM:
-------------------------------------------------------------

It seems like the task itself is finished but the output format is still writing asynchronously
!? Therefore the "isRunning" flag in *StreamTask* is set to *false* which will make this line
skip exception handling

StreamTask.java @ line 829
{code:java}
	@Override
	public void handleAsyncException(String message, Throwable exception) {
		if (isRunning) {
			// only fail if the task is still running
			getEnvironment().failExternally(exception);
		}
	}
{code}



was (Author: pete):
It seems like the task itself is finished but the output format is still writing asynchronously.
Therefore the "isRunning" flag in *StreamTask* is set to *false* which will make this line
skip exception handling

StreamTask.java @ line 829
{code:java}
	@Override
	public void handleAsyncException(String message, Throwable exception) {
		if (isRunning) {
			// only fail if the task is still running
			getEnvironment().failExternally(exception);
		}
	}
{code}


> ContinuousFileReaderOperator swallows exceptions
> ------------------------------------------------
>
>                 Key: FLINK-7430
>                 URL: https://issues.apache.org/jira/browse/FLINK-7430
>             Project: Flink
>          Issue Type: Bug
>          Components: DataStream API
>    Affects Versions: 1.3.2
>         Environment: - macOS 10.12.6
> - Oracle JDK 1.8.0_144
> - Flink 1.3.2
>            Reporter: Peter Ertl
>
> The class *ContinuousFileReaderOperator* is swallowing exceptions as the following example
demonstrates:
> {code:java}
> package org.apache.flink.streaming.examples;
> import java.io.File;
> import java.io.IOException;
> import org.apache.flink.api.common.io.OutputFormat;
> import org.apache.flink.configuration.Configuration;
> import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
> public class FormatExceptionSwallowed {
> 	public static void main(String[] args) throws Exception {
> 		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
> 		File bla = File.createTempFile("foo", "baz");
> 		try(PrintWriter w = new PrintWriter(bla)) {
> 			w.println("one");
> 			w.println("two");
> 			w.println("three");
> 		}
> 		env.readTextFile(bla.getCanonicalPath())
> 			.writeUsingOutputFormat(new OutputFormat<String>() {
> 				@Override
> 				public void configure(final Configuration parameters) {
> 				}
> 				@Override
> 				public void open(final int taskNumber, final int numTasks) throws IOException {
> 				}
> 				@Override
> 				public void writeRecord(final String record) throws IOException {
> 					throw new IllegalArgumentException("bla");
> 				}
> 				@Override
> 				public void close() throws IOException {
> 				}
> 			});
> 		env.execute("go");
> 		
> 		// JOB TERMINATES WITH NO EXCEPTION / ERROR whatsoever ... 
> 	}
> }
> {code}



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