GitHub user balidani opened a pull request:
https://github.com/apache/flink/pull/420
Added Local Clustering Coefficient Example (Help needed)
Hi!
I closed https://github.com/apache/flink/pull/400 and created this instead,
because the commit history was messed up.
I have the following exception when running
`LocalClusteringCoefficientExample`
Exception in thread "main"
org.apache.flink.api.common.functions.InvalidTypesException:
Type of TypeVariable 'K' in 'class
flink.graphs.library.LocalClusteringCoefficient
$NeighborhoodEdgesFunction' could not be determined.
This is most likely a type erasure problem. The type extraction
currently supports types
with generic variables only in cases where all variables in the return
type can be deduced
from the input type(s).
I have no idea how to fix this though. This is @vasia's old reply:
> The problem is here:
>
> DataSet<Tuple2<K, HashSet<K>>> neighborhoods =
input.reduceOnEdges(new NeighborhoodEdgesFunction<K>(), EdgeDirection.OUT);
>
> and we try to get the return type `Tuple2<K, HashSet<K>>` like this:
>
> public TypeInformation<T> getProducedType() {
> return TypeExtractor.createTypeInfo(EdgesFunction.class,
function.getClass(), 2, null, null);
> }
>
> Anyone have an idea? Is it because of the nested type parameter in
`Tuple2<K, HashSet<K>>` ?
Also, I tried propagating an additional parameter `Q extends HashSet<K>`,
but it didn't help.
Does anybody know what's wrong here?
Thanks in advance!
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/balidani/flink gelly-cc
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/420.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #420
----
commit 4b9c6be36d2252f2348e4178a9e70d01ccb01e72
Author: Dániel Bali <[email protected]>
Date: 2015-02-19T13:58:09Z
Added Local Clustering Coefficient Example (failing)
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