Adrian Nicoara created TEZ-3983:
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Summary: VertexGroup ONE_TO_ONE edges do not produce the right
graph
Key: TEZ-3983
URL: https://issues.apache.org/jira/browse/TEZ-3983
Project: Apache Tez
Issue Type: Bug
Reporter: Adrian Nicoara
A VertexGroup is described to act as a union of multiple vertices.
Consider a VertexGroup composed of 2 vertices, each with 2 tasks. If this is a
union, then the expectation is that the VertexGroup has 4 tasks. A ONE_TO_ONE
edge, to a downstream vertex, must then require that vertex to also have 4
tasks.
This is not the case, as evidenced by the [following
test|[https://github.com/apache/tez/blob/master/tez-api/src/test/java/org/apache/tez/dag/api/TestDAGVerify.java#L779-L831].]
Rather, what happens is that implementation (of unrolling the VertexGroup and
directly creating edges between the components of the VertexGroup and the
downstream vertices) is presented as the behavior.
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