[
https://issues.apache.org/jira/browse/FLINK-4624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15504308#comment-15504308
]
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
