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Examples
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The queued up message will be delivered to the destined processing units but won't be seen until the next "superstep".
Javalobby - The heart of the Java developer community riho 2010
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Each worker receive messages from previous "superstep" from its "inQ" and dispatch the message to the corresponding partition that the destination node is residing.
Javalobby - The heart of the Java developer community riho 2010
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Within each "superstep", each processing units first receive all messages delivered to them from the preceding "superstep", and then manipulate their local data and may queue up the message that it intends to send to other processing units.
Javalobby - The heart of the Java developer community riho 2010
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It signals the beginning of a new superstep to all workers after knowing all of them has completed the previous one.
Javalobby - The heart of the Java developer community riho 2010
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Fault resilience is achieved by having the checkpoint mechanism where each worker is instructed to save its in-memory graph partition to the graph storage periodically (at the beginning of a superstep).
Javalobby - The heart of the Java developer community riho 2010
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When all the processing unit finishes the message delivery (hence the synchronization point), the next superstep can be started, and the cycle repeats until the termination condition has been reached.
Javalobby - The heart of the Java developer community riho 2010
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The final aggregated value will be made available to all nodes in the next superstep.
Javalobby - The heart of the Java developer community riho 2010
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