Hi, I have several questions/comments relating to various parts of Giraph. Not sure whether they should be here or in the dev mailing list. They might have already been answered somewhere.
1) When is there likely to be a new release of Giraph, its been a while since the last one and I know there has been a lot of work on it? 2) I've been using the AccumuloVertexInputFormat, and not found it very useful - it is most likely that graph data held in Accumulo is an edge list, so would it not be better that the Accumulo Input Format for Giraph extends EdgeInputFormat instead? The current example for using with Accumulo is called AccumuloEdgeInputFormat (which extends AccumuloVertexInputFormat) - that seems to be badly named? I was also wondering what the behaviour is when using a VertexInputFormat but with an edge list - do vertices created later in the input override previous ones, and so edges get lost/ not added? 3) Is there a way to ensure that if the input file doesn't exist, the giraph job (and hence MR job) will exit, and not hang? 4) The SequenceFileReader currently assumes that the Key type is going to be the same as the Vertex name type, but in my case this isn't true. Is there, or can there be a version which allows the Sequence file key and value be different to the giraph vertex name, state, edge and message types. 5) I've been having a problem with a Giraph job successfully finishing, but the process/jvm on each compute node not being killed properly and it just sits there idle, but keeping the RAM that the job has used. Doesn't seem to be a problem when we run normal MR. We then have to manually kill each process to release the RAM. Any ideas why this might be happening? Thanks in advance for any help. Peter
