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https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504308#comment-15504308
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Fabian Hueske edited comment on FLINK-4624 at 9/19/16 6:55 PM:
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Did you try to ship {{Either}} values as member variables 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.
was (Author: fhueske):
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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