giraph-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Claudio Martella <>
Subject Re: ValueIndexed OutEdgeMap
Date Tue, 13 Sep 2011 22:34:06 GMT
ok, i understand. you suggest i IMPLEMENT BasicVertex and encapsulate
Vertex. This sounds like a possibility. Still I think there should be
an implementation without final addEdge (as the rest isn't final).

On Tue, Sep 13, 2011 at 6:31 PM, Jake Mannix <> wrote:
> Claudio,
>   If your vertex class has special internal data structures, what you'll
> want to do is subclass either BasicVertex, or MutableVertex, not Vertex.
>  And then yes, add a "getEdgesByValue()" or whatever to that class.
>   -jake
> On Tue, Sep 13, 2011 at 8:22 AM, Claudio Martella
> <> wrote:
>> Hi Jake,
>> thanks for the feedback. I checked out the patch, but it looks like it's
>> changing just the "read" access visibility. How could I provide a
>> "value"-indexed internal datastructure according to the new api? the new
>> addEdge is stil final. I can add my own "getEdgesByValue()" (as I might have
>> more outedges with the same label) to my own vertex, but i must be able to
>> modify override the addEdge() somehow.
>> On Tue, Sep 13, 2011 at 4:55 PM, Jake Mannix <>
>> wrote:
>>> Hi Claudio,
>>>   So what you want is to be able to build up your own
>>> application-specific data structure for the outbound edges of a vertex (in
>>> your case, one that effectively supports fulltext search on the edge
>>> values)?
>>>   Check out: - this
>>> change, if merged to trunk, would allow you to keep whatever edge
>>> datastructure you wanted, and implement your own internal structures.  Try
>>> out that patch, give a comment on the JIRA if you've got any thoughts!
>>>   -jake
>>> On Tue, Sep 13, 2011 at 3:09 AM, Claudio Martella
>>> <> wrote:
>>>> Hello list,
>>>> I'm currently implementing large scale path traversals over an RDF
>>>> graph. the traversals are defined by the starting vertex and a set of edge
>>>> labels that have to be traversed, if possible, to obtain all the wanted
>>>> paths. In my current scenario the vertexID is Text, and the Edge is <Text,
>>>> Text> as well, as the edge value is the edge label. For obvious reasons,
>>>> would be much more efficient to be able to obtain all the edges with a
>>>> matching Edge label (value), without iterating through the whole vertex edge
>>>> list looking for them (given avg vertex degree of K i'd go from O(K) to
>>>> O(logK) at least). I thought about creating my own labelledOutEdgeMap and
>>>> populate it by overriding Vertex.addEdge(), but that's final. I thought
>>>> about adding a method but is receiving a MutableVertex.
>>>> Do you have any suggestions?
>>>> TIA
>>>> --
>>>>     Claudio Martella
>> --
>>     Claudio Martella

    Claudio Martella

View raw message