Xiaomin Zhang created MAPREDUCE-7306:
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Summary: Mistaken cyclic check in JobControl Job DAG
Key: MAPREDUCE-7306
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7306
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: client, mrv2
Affects Versions: 3.0.0
Reporter: Xiaomin Zhang
MAPREDUCE-4371 added cyclic dependency check for a topologic sorted Job DAG.
However it is somehow not properly implemented for the `sort` phase.
In the while loop as below:
{code:java}
// code placeholder
{code}
visit the parent node followed by the child node. If the given graph contains a
cycle, then there is at least one node which is a parent as well as a child so
this will break Topological Order. Therefore, after the topological sort, check
for every directed edge whether it follows the order or not.
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