Chesnay Schepler created FLINK-14335:
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Summary: Java version of ExampleIntegrationTest in testing docs is
incorrect
Key: FLINK-14335
URL: https://issues.apache.org/jira/browse/FLINK-14335
Project: Flink
Issue Type: Task
Components: Documentation, Tests
Affects Versions: 1.9.0
Reporter: Chesnay Schepler
Fix For: 1.10.0, 1.9.1
The java version of the ExampleIntegrationTest is incorrect since it assumes
elements to arrive in the sink in order, but this isn't guaranteed since there
are 2 sink subtasks mutating a shared collection.
The scala example was modified correctly; it checks that elements are contained
with verifying the order.
{code}
public class ExampleIntegrationTest {
...
// configure your test environment
env.setParallelism(2);
...
// create a stream of custom elements and apply transformations
env.fromElements(1L, 21L, 22L)
.map(new IncrementMapFunction())
.addSink(new CollectSink());
// execute
env.execute();
// verify your results
assertEquals(Lists.newArrayList(2L, 42L, 44L), CollectSink.values);
}
// create a testing sink
private static class CollectSink implements SinkFunction<Long> {
// must be static
public static final List<Long> values = new ArrayList<>();
@Override
public synchronized void invoke(Long value) throws Exception {
values.add(value);
}
}
}
{code}
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