Issues with Giraph v1.0.0

[Pankaj Malhotra <pa...@gmail.com>]

Hi,

I am facing following issues while using giraph-1.0.0-for-hadoop-1.0.2.

1. Deletion of a vertex does not delete the incoming edges of that vertex.

2. When removeVertexRequest(sourceId,targetId) method is used inside a
for-loop, i.e., multiple delete requests are sent by a vertex, it deletes
only the last edge identified by the for-loop.

3. Edge creation does not check for duplicate edges.

Any pointers or solution will be helpful.

Thanks in advance!

Regards,
Pankaj

Re: Issues with Giraph v1.0.0

[Pankaj Malhotra <pa...@gmail.com>]

Thanks Pavan! I'll try that.


On 13 December 2013 13:42, Pavan Kumar A <pa...@outlook.com> wrote:

> Hi Pankaj,
>
> Note that in Giraph, vertex is the first-class citizen, while edges are
> just data associated with a vertex.
> So, when you delete a vertex you delete all data associated with it i.e.,
> its outgoing edges, its value, its id, etc.
>
> However, it is not trivial to delete all incoming edges to a vertex, since
> it is not directly aware of existence of such edges.
> Such edges can only be deleted at source-vertex.
>
> Note that based on the type of outedges you use, Giraph can support
> multi-graph or simple graph [both being directed of course]. So, if you
> want to avoid duplicated edges you can set OutEdge type
> to LongDoubleHashMapEdges for example. 2&3 are related.
>
> You can over-come all these at application layer by dedicating the first
> few supersteps to clean up your graph though.
>
> Thanks.
>
>
> ------------------------------
> From: pankajiitdyn@gmail.com
> Date: Fri, 13 Dec 2013 13:25:49 +0530
> Subject: Issues with Giraph v1.0.0
> To: user@giraph.apache.org
> CC: agrta.rawat@gmail.com
>
>
> Hi,
>
> I am facing following issues while using giraph-1.0.0-for-hadoop-1.0.2.
>
> 1. Deletion of a vertex does not delete the incoming edges of that vertex.
>
> 2. When removeVertexRequest(sourceId,targetId) method is used inside a
> for-loop, i.e., multiple delete requests are sent by a vertex, it deletes
> only the last edge identified by the for-loop.
>
> 3. Edge creation does not check for duplicate edges.
>
> Any pointers or solution will be helpful.
>
> Thanks in advance!
>
> Regards,
> Pankaj
>

RE: Issues with Giraph v1.0.0

[Pavan Kumar A <pa...@outlook.com>]

Hi Pankaj,
Note that in Giraph, vertex is the first-class citizen, while edges are just data associated with a vertex.So, when you delete a vertex you delete all data associated with it i.e., its outgoing edges, its value, its id, etc.
However, it is not trivial to delete all incoming edges to a vertex, since it is not directly aware of existence of such edges.Such edges can only be deleted at source-vertex.
Note that based on the type of outedges you use, Giraph can support multi-graph or simple graph [both being directed of course]. So, if you want to avoid duplicated edges you can set OutEdge type to LongDoubleHashMapEdges for example. 2&3 are related.
You can over-come all these at application layer by dedicating the first few supersteps to clean up your graph though.
Thanks.

From: pankajiitdyn@gmail.com
Date: Fri, 13 Dec 2013 13:25:49 +0530
Subject: Issues with Giraph v1.0.0
To: user@giraph.apache.org
CC: agrta.rawat@gmail.com

Hi,
I am facing following issues while using giraph-1.0.0-for-hadoop-1.0.2.
1. Deletion of a vertex does not delete the incoming edges of that vertex.
2.
 When removeVertexRequest(sourceId,targetId) method is used inside a for-loop, i.e., multiple delete requests are sent by a vertex, it deletes only the last edge identified by the for-loop.
3. Edge creation does not check for duplicate edges.



Any pointers or solution will be helpful.
Thanks in advance!
Regards,Pankaj