Github user manuzhang commented on the pull request:
https://github.com/apache/incubator-gearpump/pull/5#issuecomment-216427309
sorry, I was too optimistic previously. This example contains a cycle which
cause the generation of process levels into dead loop. Please check
https://github.com/apache/incubator-gearpump/blob/master/core/src/main/scala/io/gearpump/util/Graph.scala#L380
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