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The replication mechanism is part of the Peer-Feature and can increase the reliability of a distributed query processing in a Peer-to-Peer network of Odysseus instances. Figure 1 shows a simplified operator graph. All operators between sources and sinks are replicated several times. Each replica gets the complete data stream from its sources for processing. Without failures, each replica produce produces the same result stream. To merge the different result streams, a ReplicationMerge -Operator operator is inserted to eliminate duplicates.
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