Github user pluradj commented on the issue:
https://github.com/apache/tinkerpop/pull/361
In the failing scenario, you have GraphSONRecordReader pulling in the graph
and using Integer as the id type (via Jackson in GraphSONReader). It is getting
compared against a graph from ToyGraphInputRDD which uses Long as the id type
(via TinkerGraph default id manager). `equals()` comparison of the same value
`6` fails because the types are different.
```java.lang.AssertionError: expected: java.lang.Integer<6> but was:
java.lang.Long<6>```
Switching to `tinkerpop-modern-typed.json` instead of
`tinkerpop-modern.json` doesn't help the situation since the id type isn't
stored.
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