Varun Saxena created YARN-3862:

             Summary: Decide which contents to retrieve and send back in 
response in TimelineReader
                 Key: YARN-3862
             Project: Hadoop YARN
          Issue Type: Bug
          Components: timelineserver
    Affects Versions: YARN-2928
            Reporter: Varun Saxena
            Assignee: Varun Saxena

Currently, we will retrieve all the contents of the field if that field is 
specified in the query API. In case of configs and metrics, this can become a 
lot of data even though the user doesn't need it. So we need to provide a way 
to query only a set of configs or metrics.

As a comma spearated list of configs/metrics to be returned will be quite 
cumbersome to specify, we have to support either of the following options :
# Prefix match
# Regex
# Group the configs/metrics and query that group.

We also need a facility to specify a metric time window to return metrics in a 
that window. This may be useful in plotting graphs 

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