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: pankajiit...@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.ra...@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
