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The "Combiner" page has been changed by ChiaHungLin: http://wiki.apache.org/hama/Combiner?action=diff&rev1=1&rev2=2 Combiner in Hama BSP model is used to combine messages during [[SyncService|barrier sync]] stage. This can reduce messages sent to other peers because sending messages somehow incurs overhead[1]. == An example == - Combiner's usage can be seen in source code - CombinerExample.java, in which an user defined combiner - SumCombiner - sum up messages to be sent and add the result to BSPMessageBundle class. This decreases the total messages to just one IntegerMessage with a summary of all values. + Combiner's usage can be seen in source code - CombinerExample.java, in which an user defined combiner, SumCombiner, sums up messages to be sent and adds the result to BSPMessageBundle class. This decreases the total messages to just one IntegerMessage with a summary of all values. {{{ public static class SumCombiner extends Combiner { @@ -29, +29 @@ }}} - Combiner actually get called in sync function, + Combiner actually gets called in sync function, {{{
