private void emitEdgeInfo(PageRankValueWritable value, Context context)
throws IOException, InterruptedException {
int degree = 0;
if (edgeSet.containsKey(value.getVertexId())) {
Set<Integer> destinations = edgeSet.get(value.getVertexId());
degree = destinations.size();
}
String ouput =
""
+ value.getVertexId()
+ " "
+ value.getCurrentPageRank()
+ " "
+ value.getEdgeBlock()
+ " "
+ value.getEdgeVertex()
+ " "
+ degree;
outputText.set(ouput);
context.write(blockIdWritable, outputText);
}
@Override
public void reduce(IntWritable key, Iterable<PageRankValueWritable> values, Context context)
throws IOException, InterruptedException {
edgeSet = new HashMap<Integer, Set<Integer>>();
list = new ArrayList<PageRankValueWritable>();
writtenSelfLoopedNode = new HashSet<Integer>();
for (PageRankValueWritable value : values) {
if (value.isNodeInformation()) {
if (!value.isSelfLooped()) {
if (!edgeSet.containsKey(value.getVertexId())) {
edgeSet.put(value.getVertexId(), new HashSet<Integer>());
}
Set<Integer> destinations = edgeSet.get(value.getVertexId());
destinations.add(value.getEdgeVertex());
edgeSet.put(value.getVertexId(), destinations);
}
list.add(value.clone());
}
}
this.blockIdWritable.set(key.get());
for (PageRankValueWritable value : list) {
if (value.isNodeInformation()) {
if (!value.isSelfLooped()) {
if (!edgeSet.containsKey(value.getVertexId())) {
System.err.println("serious error");
ouputTestInfo(-1, "serious error", context);
break;
}
emitEdgeInfo(value, context);
} else {
if (!this.writtenSelfLoopedNode.contains(value.getVertexId())) {
emitEdgeInfo(value, context);
this.writtenSelfLoopedNode.add(value.getVertexId());
}
}
}
}
}
