Zhijie Shen created YARN-3914:
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             Summary: Entity created time should be part of the row key of 
entity table
                 Key: YARN-3914
                 URL: https://issues.apache.org/jira/browse/YARN-3914
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: timelineserver
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen


Entity created time should be part of the row key of entity table, between 
entity type and entity Id. The reason to have it is to index the entities. 
Though we cannot index the entities for all kinds of information, indexing them 
according to the created time is very necessary. Without it, every query for 
the latest entities that belong to an application and a type will scan through 
all the entities that belong to them. For example, if we want to list the 100 
latest started containers in an YARN app.



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