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https://issues.apache.org/jira/browse/AMBARI-20773?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aravindan Vijayan resolved AMBARI-20773.
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Resolution: Fixed
> AMS: Schema changes for nextGen feature support
> -----------------------------------------------
>
> Key: AMBARI-20773
> URL: https://issues.apache.org/jira/browse/AMBARI-20773
> Project: Ambari
> Issue Type: Epic
> Components: ambari-metrics
> Affects Versions: 3.0.0
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Critical
> Fix For: 3.0.0
>
>
> Presently, AMS stores (metricName, hostname, serverTime, appId, instanceId)
> for every row.
> Although this makes SQL query easy to write, it adds duplication when storing
> it in the Regions memory.
> This epic is used to track the investigation and implementation of a unique
> integer ID for an application-instance metric on a host and use that as a
> lookup table with a write through cache when inserting or reading data in the
> METRIC_RECORD table.
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