Matthias Kricke created FLINK-7374:
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Summary: Type Erasure in GraphUtils$MapTo
Key: FLINK-7374
URL: https://issues.apache.org/jira/browse/FLINK-7374
Project: Flink
Issue Type: Bug
Components: Gelly
Affects Versions: 1.3.1
Environment: Ubuntu 17.04
java-8-oracle
Reporter: Matthias Kricke
Priority: Minor
I got the following exception when executing ConnectedComponents or
GSAConnectedComponents algorithm:
org.apache.flink.api.common.functions.InvalidTypesException: Type of
TypeVariable 'O' in 'class org.apache.flink.graph.utils.GraphUtils$MapTo' 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).
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:915)
at
org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:836)
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:802)
at org.apache.flink.graph.Graph.mapEdges(Graph.java:544)
at
org.apache.flink.graph.library.ConnectedComponents.run(ConnectedComponents.java:76)
at
org.apache.flink.graph.library.ConnectedComponents.run(ConnectedComponents.java:51)
at org.apache.flink.graph.Graph.run(Graph.java:1792)
I copied code that is used to test the ConnectedComponents algorithm from
flink/flink-libraries/flink-gelly/src/test/java/org/apache/flink/graph/library/ConnectedComponentsWithRandomisedEdgesITCase.java
to try it on another path, because my own code which converts a Gradoop Graph
into a Gelly graph and executes the algorithm leads to the afformentioned
exception.
However, even the testcode gave me the exception.
Any ideas?
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