Paolo Castagna created GIRAPH-202:
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Summary: SimplePageRankVertex and divide by zero
Key: GIRAPH-202
URL: https://issues.apache.org/jira/browse/GIRAPH-202
Project: Giraph
Issue Type: Bug
Reporter: Paolo Castagna
Priority: Trivial
Current SimplePageRankVertex implementation might have a problem if there are
vertexes with not edges.
This should fix it (if you think it's a problem):
{code:java}
if (getSuperstep() < MAX_SUPERSTEPS) {
long edges = getNumOutEdges();
- sendMsgToAllEdges(
- new DoubleWritable(getVertexValue().get() / edges));
+ if ( edges > 0 ) {
+ sendMsgToAllEdges(
+ new DoubleWritable(getVertexValue().get() / edges));
+ }
} else {
voteToHalt();
}
{code}
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