Felix seibert created FLINK-12550:
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Summary: hostnames with a dot never receive local input splits
Key: FLINK-12550
URL:
https://issues.apache.org/jira/browse/FLINK-12550 Project: Flink
Issue Type: Bug
Components: API / DataSet
Affects Versions: 1.8.0
Reporter: Felix seibert
LocatableInputSplitAssigner (in package api.common.io) fails to assign local input splits to hosts whose hostname contains a dot ("."). To reproduce add the following test to LocatableSplitAssignerTest and execute it. It will always fail. In my mind, this is contrary to the expected behaviour, which is that the host should obtain the one split that is stored on the very same machine.
{code:java}
@Test
public void testLocalSplitAssignmentForHostWithDomainName() {
try {
String hostNameWithDot = "testhost.testdomain";
// load one split
Set<LocatableInputSplit> splits = new HashSet<LocatableInputSplit>();
splits.add(new LocatableInputSplit(0, hostNameWithDot));
// get all available splits
LocatableInputSplitAssigner ia = new LocatableInputSplitAssigner(splits);
InputSplit is = null;
ia.getNextInputSplit(hostNameWithDot, 0);
assertEquals(0, ia.getNumberOfRemoteAssignments());
assertEquals(1, ia.getNumberOfLocalAssignments());
}
catch (Exception e) {
e.printStackTrace();
fail(e.getMessage());
}
}
{code}
I also experienced this error in practice, and will later today open a pull request to fix it.
Note: I'm not sure if I selected the correct component category.
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