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From "Jake Mannix (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-28) Introduce new primitive-specific MutableVertex subclasses
Date Tue, 13 Sep 2011 05:13:09 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103363#comment-13103363
] 

Jake Mannix commented on GIRAPH-28:
-----------------------------------

As for sorting, I'd imagine that assuming it always returns a sorted iterator is fine, but
yes, some implementations I can imagine might not want to do that.  I'd lean against having
multiple iterators until it was known that they were needed, and maybe just document the ones
which return nonsorted ones so that things don't get messed up? 

Vertex subclasses are where the "algorithms" are implemented, right?  So a Vertex knows whether
it has a sorted iterator or not... the only question would be: are there generic methods implemented
in things like BspServiceWorker, or GraphMapper, which would be expected to need to do things
to a sorted iterator?  Currently there are no such places that I can see.   Without such cases,
we could easily leave Vertex implementations to decide whether they needed to return sorted
iterators or not.

> Introduce new primitive-specific MutableVertex subclasses
> ---------------------------------------------------------
>
>                 Key: GIRAPH-28
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-28
>             Project: Giraph
>          Issue Type: New Feature
>          Components: graph
>    Affects Versions: 0.70.0
>            Reporter: Jake Mannix
>            Assignee: Jake Mannix
>         Attachments: GIRAPH-28.diff, GIRAPH-28.diff
>
>
> As discussed on the list, MutableVertex<LongWritable,DoubleWritable,FloatWritable,DoubleWritable>
(for example) could be highly optimized in its memory footprint if the vertex and edge data
were held in a form which minimized Java object usage.

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