Fabian Hueske commented on FLINK-4624:

Did you try to ship the {{Either}} types as part of the user function? 
User function objects are serialized on the client with Java serialization to 
ship them to the worker nodes. Therefore, all members must be {{Serializable}}. 
Maybe you can declare these fields as {{transient}} and initialize them in the 
{{open()}} method.

> Gelly's summarization algorithm cannot deal with null vertex group values
> -------------------------------------------------------------------------
>                 Key: FLINK-4624
>                 URL: https://issues.apache.org/jira/browse/FLINK-4624
>             Project: Flink
>          Issue Type: Bug
>          Components: Gelly
>            Reporter: Till Rohrmann
>            Assignee: Martin Junghanns
>             Fix For: 1.2.0
> Gelly's {{Summarization}} algorithm cannot handle null values in the 
> `VertexGroupItem.f2`. This behaviour is hidden by using Strings as a vertex 
> value in the {{SummarizationITCase}}, because the {{StringSerializer}} can 
> handle null values. 

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