GH-66: Oozie should not queue the same command more than once
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Key: OOZIE-101
URL: https://issues.apache.org/jira/browse/OOZIE-101
Project: Oozie
Issue Type: Bug
Reporter: Hadoop QA
Oozie needs to maintain an in-memory data structure (e.g. concurrent hashmap)
to make sure if a command is already in the queue, the next one should not be
en-queued.
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