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From "步青云" <mailliup...@qq.com>
Subject Hama:Messages must never be behind the vertex in ID
Date Wed, 08 Jan 2014 09:04:53 GMT
        I run my own program in Hama.I use the function sendMessageToNeighbors() to send messages
to neighbors of each vertex.But I get the following errors.

       14/01/08 14:49:46 ERROR bsp.LocalBSPRunner: Exception during BSP execution!
java.lang.IllegalArgumentException: Messages must never be behind the vertex in ID! Current
Message ID: 2 vs. 5
	at org.apache.hama.graph.GraphJobRunner.iterate(GraphJobRunner.java:284)
	at org.apache.hama.graph.GraphJobRunner.doSuperstep(GraphJobRunner.java:229)
	at org.apache.hama.graph.GraphJobRunner.bsp(GraphJobRunner.java:133)
	at org.apache.hama.bsp.LocalBSPRunner$BSPRunner.run(LocalBSPRunner.java:256)
	at org.apache.hama.bsp.LocalBSPRunner$BSPRunner.call(LocalBSPRunner.java:286)
	at org.apache.hama.bsp.LocalBSPRunner$BSPRunner.call(LocalBSPRunner.java:1)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:724)
        I'm sure that all edges point to existing vertices.So I'm all adrift about this error.Could
you help me to solve this problem?Thank you a lot.
        Best wishes.
    Ping Liu 
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