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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1514) [Gelly] Add a Gather-Sum-Apply iteration method
Date Sun, 08 Mar 2015 13:40:38 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14352041#comment-14352041
] 

ASF GitHub Bot commented on FLINK-1514:
---------------------------------------

Github user StephanEwen commented on the pull request:

    https://github.com/apache/flink/pull/408#issuecomment-77749391
  
    In the core API, we have started to define all functions (map, join, ... - here it would
be SumFunction, ApplyFunction) as single-abstract-method interfaces. That allows to use Java
8 lambas (Scala may pick this up as well). For each function, there is a `RichFunction` variant
which has the `open()` and `close()` methods, and the `getRuntimeContext()` (here the `preSuperstep()`
and `postSuperstep()` methods).


> [Gelly] Add a Gather-Sum-Apply iteration method
> -----------------------------------------------
>
>                 Key: FLINK-1514
>                 URL: https://issues.apache.org/jira/browse/FLINK-1514
>             Project: Flink
>          Issue Type: New Feature
>          Components: Gelly
>    Affects Versions: 0.9
>            Reporter: Vasia Kalavri
>            Assignee: Daniel Bali
>
> This will be a method that implements the GAS computation model, but without the "scatter"
step. The phases can be mapped into the following steps inside a delta iteration:
> gather: a map on each < srcVertex, edge, trgVertex > that produces a partial value
> sum: a reduce that combines the partial values
> apply: join with vertex set to update the vertex values using the results of sum and
the previous state.



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