[Pulp-dev] Pagination in Pulp

Dennis Kliban dkliban at redhat.com
Tue Jun 26 13:48:41 UTC 2018


The user should be able to specify a page size at request time. The user
should also be able to specify which page they are requesting.

On Tue, Jun 26, 2018 at 9:31 AM, David Davis <daviddavis at redhat.com> wrote:

> I was looking at the pagination code this morning and there were two
> things I wanted to discuss.
>
> First, there’s no way to override the number of results per request.
> Instead, page size has to be configured for the whole app. Allowing users
> to override page size is trivial[0] so I wonder if we should enable it.
>
> The second topic is a bit more complex. We currently use cursor based
> pagination where pages must be fetched sequentially as opposed to the
> default DRF pagination method of using page numbers. Cursors work great for
> large data sets as you don’t have to figure out things like the number of
> pages.
>
> The first problem is that in Pulp we parallelize web requests for things
> like fetching metadata. See our Ansible plugin as an example[1]. If we want
> to support things like syncing content from one Pulp server to another, we
> probably have to use offset/page-based pagination for certain endpoints.
>
> Another consideration is Katello. In Katello’s UI they show the number of
> pages and allow users to jump to arbitrary pages or the last page. If we
> want Katello to stop indexing Pulp data and instead query Pulp directly,
> we’ll need to allow them to use page numbers somehow.
>
> Thoughts?
>
> [0] https://gist.github.com/daviddavis/56a0b86629cd675d57aac61583c01944
> [1] https://github.com/pulp/pulp_ansible/blob/master/pulp_
> ansible/app/tasks/synchronizing.py#L147-L171
>
> David
>
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