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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-9262) KeyedOneInputStreamOperatorTestHarness throws NPE creating snapshot
Date Wed, 02 May 2018 12:44:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-9262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aljoscha Krettek updated FLINK-9262:
------------------------------------
    Fix Version/s: 1.6.0

> KeyedOneInputStreamOperatorTestHarness throws NPE creating snapshot
> -------------------------------------------------------------------
>
>                 Key: FLINK-9262
>                 URL: https://issues.apache.org/jira/browse/FLINK-9262
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming, Tests
>    Affects Versions: 1.4.0
>         Environment: macOS X High Sierra 10.13.4
> (ancient) Eclipse Luna v.4.4.1 
> JRE System Library [Java SE 8 [1.8.0_131]]
> Java 8 Update 171 build 11
>            Reporter: Chris Schneider
>            Priority: Major
>             Fix For: 1.6.0
>
>
> Although KeyedOneInputStreamOperatorTestHarness and other AbstractStreamOperatorTestHarness
subclasses are not yet part of the public Flink API, we have been trying to make use of them
for unit testing our map functions. The following code throws NPE from the attempt to collect
a snapshot on Flink 1.4.0 (even after applying [the fix|https://github.com/apache/flink/pull/5193/commits/ba676d7de5536e32e0c48c3db511bec1758f4e80]
for FLINK-8268), but appears to work properly on Flink 1.5-SNAPSHOT:
> {code:java}
> package com.scaleunlimited.flinkcrawler.functions;
> import org.apache.flink.api.common.functions.RichFlatMapFunction;
> import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
> import org.apache.flink.api.java.functions.KeySelector;
> import org.apache.flink.streaming.api.operators.StreamFlatMap;
> import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
> import org.apache.flink.streaming.util.KeyedOneInputStreamOperatorTestHarness;
> import org.apache.flink.util.Collector;
> import org.junit.Test;
> public class FlinkIssueTest {
>     
>     @SuppressWarnings("serial")
>     private static class MyProcessFunction extends RichFlatMapFunction<String,
String> {
>         @Override
>         public void flatMap(String input, Collector<String> collector) throws
Exception {
>             collector.collect(input);
>         }
>     }
>     
>     @SuppressWarnings({
>             "serial", "hiding"
>     })
>     private static class MyKeySelector<String> implements KeySelector<String,
String> {
>         @Override
>         public String getKey(String input) throws Exception {
>             return input;
>         }
>     }
>     @Test
>     public void test() throws Throwable {
>         KeyedOneInputStreamOperatorTestHarness<String, String, String> testHarness
=
>             new KeyedOneInputStreamOperatorTestHarness<String, String,
String>(
>                 new StreamFlatMap<>(new MyProcessFunction()),
>                 new MyKeySelector<String>(),
>                 BasicTypeInfo.STRING_TYPE_INFO,
>                 1,
>                 1,
>                 0);
>         testHarness.setup();
>         testHarness.open();
>         
>         for (int i = 0; i < 10; i++) {
>             String urlString = String.format("https://domain-%d.com/page1",
i);
>             testHarness.processElement(new StreamRecord<>(urlString));
>         }
>         testHarness.snapshot(0L, 0L);
>     }
> }
> {code}
> Output:
> {noformat}
> java.lang.Exception: Could not complete snapshot 0 for operator MockTask (1/1).
>     at org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:379)
>     at org.apache.flink.streaming.util.AbstractStreamOperatorTestHarness.snapshot(AbstractStreamOperatorTestHarness.java:459)
>     at com.scaleunlimited.flinkcrawler.functions.FlinkIssueTest.test(FlinkIssueTest.java:51)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:498)
>     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
>     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
>     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
>     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
>     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
> Caused by: java.lang.NullPointerException
>     at org.apache.flink.util.Preconditions.checkNotNull(Preconditions.java:58)
>     at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.snapshotFunctionState(StreamingFunctionUtils.java:95)
>     at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.snapshotState(AbstractUdfStreamOperator.java:90)
>     at org.apache.flink.streaming.api.operators.AbstractStreamOperator.snapshotState(AbstractStreamOperator.java:357)
>     ... 25 more
> {noformat}
>  



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