Jason Lowe created TEZ-3909:
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Summary: DAG can hang if vertex with no tasks is killed
Key: TEZ-3909
URL: https://issues.apache.org/jira/browse/TEZ-3909
Project: Apache Tez
Issue Type: Bug
Affects Versions: 0.9.0
Reporter: Jason Lowe
Assignee: Jason Lowe
If a vertex with no tasks is killed just as it is starting then the vertex can
fail to reach a terminal state if the terminate event arrives while the vertex
is still in the RUNNING state. The terminate moves it to the TERMINATING state
which ignores the V_COMPLETED event that later arrives. Once it drops the
completed event, no other event will kick it out of the TERMINATING state and
the DAG hangs forever waiting for all vertices to complete.
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