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https://issues.apache.org/jira/browse/FLINK-2541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703841#comment-14703841
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Chesnay Schepler edited comment on FLINK-2541 at 8/19/15 10:20 PM:
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I did some digging and found the following:
within createComparator() there are effectively 2 cases that are considered:
# we are looking at a tuple that could contain the key
# we are looking at an AtomicType that is the key
The problem appears to be that when the key is a byte[], the second cases
doesn't apply because PrimitiveArrayTypeInfo does not implement AtomicType.
This causes the field to be skipped, effectively ending with 0 comparison
fields set, and the exception being set off.
Soooo it appears that you can't group on a byte[], which blocks FLINK-2501.
Probably also need an GenericArrayComparator aswell...
was (Author: zentol):
I did some digging and found the following:
within createComparator() there are effectively 2 cases that are considered:
# we are looking at a tuple that could contain the key
# we are looking at an AtomicType that is the key
The problem appears to be that when the key is a byte[], none of these two
cases apply because PrimitiveArrayTypeInfo does not implement AtomicType. This
causes the field to be skipped, effectively ending with 0 comparison fields
set, and the exception being set off.
Soooo it appears that you can't group on a byte[], which blocks FLINK-2501.
Probably also need an GenericArrayComparator aswell...
> TypeComparator creation fails for T2<T1<byte[]>, byte[]>
> --------------------------------------------------------
>
> Key: FLINK-2541
> URL: https://issues.apache.org/jira/browse/FLINK-2541
> Project: Flink
> Issue Type: Bug
> Components: Java API
> Reporter: Chesnay Schepler
>
> When running the following job as a JavaProgramTest:
> {code}
> ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();
> DataSet<Tuple2<Tuple1<byte[]>, byte[]>> data = env.fromElements(
> new Tuple2<Tuple1<byte[]>, byte[]>(
> new Tuple1<byte[]>(new byte[]{1, 2}),
> new byte[]{1, 2, 3}),
> new Tuple2<Tuple1<byte[]>, byte[]>(
> new Tuple1<byte[]>(new byte[]{1, 2}),
> new byte[]{1, 2, 3}));
> data.groupBy("f0.f0")
> .reduceGroup(new DummyReduce<Tuple2<Tuple1<byte[]>, byte[]>>())
> .print();
> {code}
> with DummyReduce defined as
> {code}
> public static class DummyReduce<IN> implements GroupReduceFunction<IN, IN> {
> @Override
> public void reduce(Iterable<IN> values, Collector<IN> out) throws Exception {
> for (IN value : values) {
> out.collect(value);
> }}}
> {code}
> i encountered the following exception:
> Tuple comparator creation has a bug
> java.lang.IllegalArgumentException: Tuple comparator creation has a bug
> at
> org.apache.flink.api.java.typeutils.TupleTypeInfo.getNewComparator(TupleTypeInfo.java:131)
> at
> org.apache.flink.api.common.typeutils.CompositeType.createComparator(CompositeType.java:133)
> at
> org.apache.flink.api.common.typeutils.CompositeType.createComparator(CompositeType.java:122)
> at
> org.apache.flink.api.common.operators.base.GroupReduceOperatorBase.getTypeComparator(GroupReduceOperatorBase.java:155)
> at
> org.apache.flink.api.common.operators.base.GroupReduceOperatorBase.executeOnCollections(GroupReduceOperatorBase.java:184)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.executeUnaryOperator(CollectionExecutor.java:236)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:143)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.executeUnaryOperator(CollectionExecutor.java:215)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:143)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:125)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.executeDataSink(CollectionExecutor.java:176)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:152)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:125)
> at
> org.apache.flink.api.common.operators.CollectionExecutor.execute(CollectionExecutor.java:109)
> at
> org.apache.flink.api.java.CollectionEnvironment.execute(CollectionEnvironment.java:33)
> at
> org.apache.flink.test.util.CollectionTestEnvironment.execute(CollectionTestEnvironment.java:35)
> at
> org.apache.flink.test.util.CollectionTestEnvironment.execute(CollectionTestEnvironment.java:30)
> at org.apache.flink.api.java.DataSet.collect(DataSet.java:408)
> at org.apache.flink.api.java.DataSet.print(DataSet.java:1349)
> at
> org.apache.flink.languagebinding.api.java.python.AbstractPythonTest.testProgram(AbstractPythonTest.java:42)
> at
> org.apache.flink.test.util.JavaProgramTestBase.testJobCollectionExecution(JavaProgramTestBase.java:226)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:606)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
> at
> org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)
> at
> org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)
> at
> org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)
> at
> org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
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