[jira] [Commented] (HAMA-571) Provide graph repair function in GraphJobRunner

["Edward J. Yoon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HAMA-571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276598#comment-13276598 ] 

Edward J. Yoon commented on HAMA-571:
-------------------------------------

+1 on adding repair function.
                
> 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_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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