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Date: Tue, 24 May 2016 09:49:13 +0000 (UTC)
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Subject: [jira] [Commented] (CLOUDSTACK-9377) Metrics data incorrectly
 calculated in zone/cluster metrics view
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archived-at: Tue, 24 May 2016 09:49:29 -0000


    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15297983#comment-15297983 ] 

ASF subversion and git services commented on CLOUDSTACK-9377:
-------------------------------------------------------------

Commit a38b17fff2da18dc480fed684f84e1e6f03a910b in cloudstack's branch refs/heads/4.9-bountycastle-daan from [~williamstevens@gmail.com]
[ https://git-wip-us.apache.org/repos/asf?p=cloudstack.git;h=a38b17f ]

Merge pull request #1540 from shapeblue/metrics-pagesize-fix

CLOUDSTACK-9377: Fix metrics pagesize issueFixes listing of clusters and host to list all clusters/hosts by passing
pagesize=-1.

/cc @koushik-das @swill @DaanHoogland -- fixes the issue raised on dev@ ML by Rashmi

* pr/1540:
  CLOUDSTACK-9377: Fix metrics pagesize issue

Signed-off-by: Will Stevens <williamstevens@gmail.com>


> Metrics data incorrectly calculated in zone/cluster metrics view
> ----------------------------------------------------------------
>
>                 Key: CLOUDSTACK-9377
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9377
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: UI
>    Affects Versions: 4.7.0
>            Reporter: Rashmi Dixit
>            Assignee: Rohit Yadav
>              Labels: UI, metrics
>             Fix For: 4.9.0
>
>
> In the zone metrics view, listClusters and listHosts APIs are being used to compute average used and allocated data for metrics calculations. 
> Issue:
> 1. All APIs have a default pagesize. Count of results are always equal to the default pagesize if not explicitly passed. The UI is not passing anything related to pagesize to these APIs
> 2. Example to explain issue
> 600 hosts in a cluster. Default Page size = 500. 
> There is only one call to fetch clusters. This will fetch a maximum of 500 records. If there are more, then these aren't fetched. 
> For each cluster, listHosts is called to fetch hosts. Since page size is 500 only 500 results are returned.
> Computation for 500 hosts is done but for calculating average this value is divided by 600. This is incorrect.
> UI should fetch all hosts in one go and correctly calculate metrics. However, this will result in performance degradation as number of hosts/clusters increase.
> Ideally a new API needs to be introduced for this metrics calculation. 
> Same issue is present in the cluster metrics view.


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