[Pulp-dev] Pagination in Pulp

Jeff Ortel jortel at redhat.com
Tue Jun 26 19:57:35 UTC 2018

On 06/26/2018 08:48 AM, Dennis Kliban wrote:
> 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.

+ 1
> On Tue, Jun 26, 2018 at 9:31 AM, David Davis <daviddavis at redhat.com 
> <mailto: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
>     <https://gist.github.com/daviddavis/56a0b86629cd675d57aac61583c01944>
>     [1]
>     https://github.com/pulp/pulp_ansible/blob/master/pulp_ansible/app/tasks/synchronizing.py#L147-L171
>     <https://github.com/pulp/pulp_ansible/blob/master/pulp_ansible/app/tasks/synchronizing.py#L147-L171>
>     David
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