Zhijie Shen created YARN-3551:

             Summary: Consolidate data model change according the backend 
                 Key: YARN-3551
                 URL: https://issues.apache.org/jira/browse/YARN-3551
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: timelineserver
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen

Based on the comments on 
 we need to change the data model to restrict the data type of 
info/config/metric section.

1. Info: the value could be all kinds object that is able to be 
serialized/deserialized by jackson.

2. Config: the value will always be assumed as String.

3. Metric: single data or time series value have to be number for aggregation.

Other than that, info/start time/finish time of metric seem not to be necessary 
for storage. They should be removed.

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