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Start working with aggregators
To start aggregating values from your vertices, is very easy and strait forward. From your vertex, use:
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this.aggregate(index,value);
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Get results
Inside your vertex, you can get the results of each aggregator by using this method:
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To write your own aggregator, you have o extend AbstractAggregator class and implement the methods of #aggregate(M value) and #getValue(). For more, please see the default implemented aggregators in org.apache.hama.graph package.