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https://issues.apache.org/jira/browse/FLINK-5161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15695728#comment-15695728
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Vasia Kalavri commented on FLINK-5161:
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Hi Wouter,
the vertex value caries the distance from every vertex to the source. Since
this is a weighted SSSP, this is of double type.
Gelly examples favor simplicity and demonstrate functionality. As a user, you
should use the library algorithms. And in the library algorithm that you link
to, the vertex value is actually parametrized (see the last commit), so you can
use any type you like.
> accepting NullValue for VV in Gelly examples and GSA
> ----------------------------------------------------
>
> Key: FLINK-5161
> URL: https://issues.apache.org/jira/browse/FLINK-5161
> Project: Flink
> Issue Type: Improvement
> Components: Gelly
> Affects Versions: 1.1.3
> Reporter: wouter ligtenberg
>
> I made this topic a few days ago about EV, i meant VV back then, i don't know
> why i suddenly thought about EV and it confused myself.
> In this gelly example [1] and this GSA algorithm [2] a Vertex Value of Double
> is required but never used, wouldn't it be better to change this into a
> NullValue? I create a lot of data without Vertex Values and it seems to me
> that it's more efficient
> I'd like to hear your thoughts on this
> [1]
> https://github.com/apache/flink/blob/master/flink-libraries/flink-gelly-examples/src/main/java/org/apache/flink/graph/examples/SingleSourceShortestPaths.java
> [2]
> https://github.com/apache/flink/blob/master/flink-libraries/flink-gelly/src/main/java/org/apache/flink/graph/library/GSASingleSourceShortestPaths.java
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