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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-12654) Create a Caching layer that provides sliding window behavior for metric requests to Ambari
Date Thu, 20 Aug 2015 02:57:45 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-12654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14704219#comment-14704219
] 

Hudson commented on AMBARI-12654:
---------------------------------

FAILURE: Integrated in Ambari-branch-2.1 #395 (See [https://builds.apache.org/job/Ambari-branch-2.1/395/])
AMBARI-12654. Null check for cache value. (swagle) (swagle: http://git-wip-us.apache.org/repos/asf?p=ambari.git&a=commit&h=c5a2b032ab8aa445b05973763ce2408c34234a3e)
* ambari-server/src/main/java/org/apache/ambari/server/controller/metrics/timeline/cache/TimelineMetricCache.java


> 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
>
>         Attachments: AMBARI-12654-1.patch, AMBARI-12654-2.pach
>
>
> _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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