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The default implementation of Apache Hama is org.apache.hama.bsp.message.HadoopMessageManagerImplHamaMessageManagerImpl which uses Hadoop's RPC mechanisms.
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Your implemenation can be set by the configuration values:
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hama.messangermessenger.class |
Make sure this configuration is consistent on every host in every configuration. And make sure that the class has a public default constructure since it will be instantiated via reflection.