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From "Alessandro Presta (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (GIRAPH-155) Allow creation of graph by adding edges that span multiple workers
Date Tue, 30 Oct 2012 04:32:13 GMT

     [ https://issues.apache.org/jira/browse/GIRAPH-155?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alessandro Presta reassigned GIRAPH-155:
----------------------------------------

    Assignee: Alessandro Presta
    
> Allow creation of graph by adding edges that span multiple workers
> ------------------------------------------------------------------
>
>                 Key: GIRAPH-155
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-155
>             Project: Giraph
>          Issue Type: New Feature
>          Components: graph, lib
>    Affects Versions: 0.1.0
>            Reporter: Dionysios Logothetis
>            Assignee: Alessandro Presta
>
> Currently a graph is created only be adding vertices. The typical way is to read input
text files line-by-line with each line describing a vertex (its value, its edges etc). The
current API allows for the creation of a vertex only if all the information for the vertex
is available in a single line.
> However, it's common to have graphs described in the form of edges. Edges might span
multiple lines in an input file or even span multiple workers. The current API doesn't allow
this. In the input superstep, a vertex must be created by a single worker.
> Instead, it should be possible for multiple workers to mutate the graph during the input
superstep.
> This has the following implications:
> 1) Instead of just instantiating a vertex, a vertex reader should be able to do vertex
addition and edge addition requests.
> 2) Multiple workers might try to create the same vertex. Any conflicts should be handled
with a VertexResolver. So the resolver has to be instantiated before load time.

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