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https://issues.apache.org/jira/browse/SOLR-16712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17716711#comment-17716711
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ASF subversion and git services commented on SOLR-16712:
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Commit 0bb5129a7d868ecd0240d8346d60c1f23bd768ac in solr's branch
refs/heads/main from patsonluk
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=0bb5129a7d8 ]
SOLR-16712: Simplify DocCollection ctor for PRS enabled collection (#1477)
> Simplify PerReplicaStates (PRS) logic in DocCollection, replace PrsSupplier
> with actual PerReplicaStates param
> --------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-16712
> URL: https://issues.apache.org/jira/browse/SOLR-16712
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: main (10.0), 9.1.1
> Reporter: Patson Luk
> Priority: Major
> Time Spent: 2h
> Remaining Estimate: 0h
>
> The current implementation of PRS requires an extra param to the
> DocCollection, the `PrsSupplier`, when `get` is called, would fetch the PRS
> states from ZK. The implementation of such supplier `LazyPrsSupplier` would
> only fetch the state on first call.
>
> While this flow does work properly, this flow might introduce some
> unnecessary complexity:
> # PRS entry fetching from ZK is done either during or after the
> `DocCollection` construction, this could be a bit inconsistent with existing
> non PRS `DocCollection` design which `DocCollection` is simply a immutable
> container that does not fetch data after its instantiation
> # The lazy fetching could introduce some uncertainties as to when exactly
> the fetching happens (and if any Zookeeper IO exceptions arises)
>
> My guess was that the lazy loading was introduced in
> https://issues.apache.org/jira/browse/SOLR-16580 as to avoid fetching the PRS
> states multiple times in the ctor of `DocCollection`, however, if we only
> fetch the `PerReplicaStates` once on update before calling the
> `DocCollection` ctor, and pass the `PerReplicaStates` object to the
> `DocCollection` instead, it can probably achieve similar result but with
> reduced uncertainty after `DocCollection` construction.
>
> There's another branch which experimented with making DocCollection, Slice
> and Replica immutable as well for PRS enabled collection
> [https://github.com/cowpaths/fullstory-solr/pull/84] but is beyond the
> discussion of this Jira ticket
>
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