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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-423) Improve and Refactor Partitioning in the Examples
Date Sat, 20 Aug 2011 08:42:27 GMT

    [ https://issues.apache.org/jira/browse/HAMA-423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088164#comment-13088164
] 

Thomas Jungblut commented on HAMA-423:
--------------------------------------

Once comitted we have to rewrite http://wiki.apache.org/hama/SSSP, it is now a textfile, for
the people who want to submit their own graph and for them who download a large sequencefile.

Later on we can extend AbstractGraphPartitioner to work with some kind of inputformat,recordreader
or compression codec. So it is once step to HAMA-258.
We can use this in the Pregel API, too since this is class based via configuration: 
{noformat}
(Class<T>) conf.getClass("hama.partitioning.vertex.class",
        Vertex.class);
{noformat}

Would someone please review this with a sample file?

> Improve and Refactor Partitioning in the Examples
> -------------------------------------------------
>
>                 Key: HAMA-423
>                 URL: https://issues.apache.org/jira/browse/HAMA-423
>             Project: Hama
>          Issue Type: Improvement
>          Components: examples
>    Affects Versions: 0.3.0
>            Reporter: Thomas Jungblut
>            Assignee: Thomas Jungblut
>             Fix For: 0.4.0, 0.5.0
>
>         Attachments: HAMA-423-v1.patch
>
>
> Currently partitioning will write a key/value pair for each vertex/adjacent mapping.
> This results in heavy IO writes which actually bloats the file and let the partitioning
take unnecessarily long.
> We should partition directly into the vertex classes and implement a vertex list/array
writable which just writes a single key/value pair for a vertex/all-adjacents mapping.
> In fact we should make it generic, passing a vertex class which should implement the
Writable interface.

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