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Posted to dev@ambari.apache.org by "Siddharth Wagle (JIRA)" <ji...@apache.org> on 2015/08/06 00:14:04 UTC
[jira] [Created] (AMBARI-12654) Create a Caching layer that
provides sliding window behavior for metric requests to Ambari
Siddharth Wagle created AMBARI-12654:
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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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