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From "Siddharth Wagle (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMBARI-12654) Create a Caching layer that provides sliding window behavior for metric requests to Ambari
Date Wed, 05 Aug 2015 22:14:04 GMT
Siddharth Wagle created AMBARI-12654:
----------------------------------------

             Summary: Create a Caching layer that provides sliding window behavior for metric
requests to Ambari
                 Key: AMBARI-12654
                 URL: https://issues.apache.org/jira/browse/AMBARI-12654
             Project: Ambari
          Issue Type: Task
          Components: ambari-server
    Affects Versions: 2.0.0
            Reporter: Siddharth Wagle
            Assignee: Siddharth Wagle
            Priority: Critical
             Fix For: 2.1.2


_Objectives_:
-    In-memory caching of timeseries data for 1 hour queries.
-    Support of service and dashboard metrics only
-    Cache refresh is for a small segment of data vs requesting 1 hour data every time.
-    On demand cache with sliding window implementation
-    Zero/Null padding data does not appear in the cache
-    Cache functionality can be turned on / off using config knob
-    Caching policy is a cache-as-sor (Cache as System of Record), all queries for Service
Metrics will be returned from cache if caching is enabled and query window fits Cache timeseries
window, example 1 hour.
 -   Host metric queries will still goto AMS, this prevents host specific data to be cached.
This decision is based on usage/access pattern from Ambari web UI.




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