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https://issues.apache.org/jira/browse/CLOUDSTACK-9377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281247#comment-15281247
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Rohit Yadav commented on CLOUDSTACK-9377:
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I had a quick look at the code, the issue indeed will happen if a cluster has
more than 500 (default page size) the issue you've mentioned will occur. A
quick hack would be to pass pagesize=-1 in the list APIs, for example can you
test by placing pagesize=-1 here
https://github.com/apache/cloudstack/blob/master/ui/scripts/metrics.js#L166 and
comment if that fixes the issue for you.
Practically, I would assume nobody would have more than 500 hosts in a cluster
but I don't know if we've users out there having something like that.
> 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
> Labels: UI, metrics
>
> 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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