Allow creation of graph by adding edges that span multiple workers
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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
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:
(i) Instead of just instantiating a vertex, a vertex reader should be able to
do vertex addition and edge addition requests.
(ii) 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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