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https://issues.apache.org/jira/browse/FLINK-2563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708391#comment-14708391
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ASF GitHub Bot commented on FLINK-2563:
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GitHub user vasia opened a pull request:
https://github.com/apache/flink/pull/1042
[FLINK-2563] [gelly] changed Graph's run() to return an arbitrary result
type
Added a type parameter to the 'GraphAlgorithm' interface to allow
implementing library methods that return single values, Graphs of different
types, etc.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/vasia/flink graphAlgorithm
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/1042.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #1042
----
commit ff7240b9fd1a899c938108604875ea16023e7a78
Author: vasia <[email protected]>
Date: 2015-08-23T11:06:15Z
[FLINK-2563] [gelly] extended the run() method of GraphAlgorithm interface
to return an arbitrary type
----
> Gelly's Graph Algorithm Interface is limited
> --------------------------------------------
>
> Key: FLINK-2563
> URL: https://issues.apache.org/jira/browse/FLINK-2563
> Project: Flink
> Issue Type: Improvement
> Components: Gelly
> Affects Versions: 0.9, 0.10
> Reporter: Andra Lungu
> Assignee: Vasia Kalavri
>
> Right now, Gelly's `GraphAlgorithm` interface only allows users/devs to
> return the same type of Graph.
> public Graph<K, VV, EV> run(Graph<K, VV, EV> input) throws Exception;
> In numerous cases, one needs to return a single value, or a modified graph.
> Off the top of my head, say one would like to implement a Triangle Count
> library method. That takes as input a Graph and returns the total number of
> triangles.
> https://github.com/andralungu/gelly-partitioning/blob/master/src/main/java/example/GSATriangleCount.java
> With the current Gelly abstractions, something like this cannot be supported.
> Also if I initially had a Graph of Long, Long, NullValue and my algorithm
> changed the edge values to type Double, for instance, I would again have
> created an implementation which is not supported.
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