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From "Thomas Jungblut (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HAMA-571) Provide graph repair function in GraphJobRunner
Date Wed, 16 May 2012 18:21:08 GMT

     [ https://issues.apache.org/jira/browse/HAMA-571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Thomas Jungblut updated HAMA-571:

    Attachment: HAMA-571_2.patch

haha, it was a bit more difficult, because we are added an additional sync in the code, therefore
some conditions failed (getSuperstepCount > 1). 
It is needed to rely on the tracked iteration count, not that sync. 

I put that into the testcases of connected components and pagerank. These are two distinct
cases, the last one needs self referencing on the edges.

Please review this!
> Provide graph repair function in GraphJobRunner
> -----------------------------------------------
>                 Key: HAMA-571
>                 URL: https://issues.apache.org/jira/browse/HAMA-571
>             Project: Hama
>          Issue Type: Improvement
>          Components: bsp core, graph
>            Reporter: Thomas Jungblut
>            Assignee: Thomas Jungblut
>         Attachments: HAMA-571_2.patch, HAMA-571_windows_first.patch
> As discussed here, we want to add a configurable checker that repairs maybe broken graph
adjacency lists.
> http://mail-archives.apache.org/mod_mbox/incubator-hama-user/201204.mbox/%3CCAJ-%3DysmSdYoX5t1pPjGi0KXWM%3DYVN2s8CoCgw5V3jXU3F74MHw%40mail.gmail.com%3E
> Currently each vertex addressed in an edge by the adjacency list is needed on the vertex
map somewhere in the cluster.
> If that vertex isn't available it will result in NullPointerExceptions.
> Pseudocode is attached in that mail archive.

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