[solr] branch branch_9_3 updated: SOLR-16693: upgrade notes (#1803)

[ds...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

dsmiley pushed a commit to branch branch_9_3
in repository https://gitbox.apache.org/repos/asf/solr.git


The following commit(s) were added to refs/heads/branch_9_3 by this push:
     new 20fe670518f SOLR-16693: upgrade notes (#1803)
20fe670518f is described below

commit 20fe670518fc2925bbf7780a5db01aad4b3bc751
Author: David Smiley <ds...@apache.org>
AuthorDate: Sun Jul 23 17:30:54 2023 -0400

    SOLR-16693: upgrade notes (#1803)
    
    Mention solr.useExitableDirectoryReader
---
 .../modules/upgrade-notes/pages/major-changes-in-solr-9.adoc       | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
index 0472177084f..742963e05e9 100644
--- a/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
+++ b/solr/solr-ref-guide/modules/upgrade-notes/pages/major-changes-in-solr-9.adoc
@@ -108,6 +108,13 @@ The custom version of Solr will include this Dockerfile when it is built.
 Prior to Solr 9.3, if no corresponding entry existed the core was deleted automatically to remove the orphaned files.
 As of Solr 9.3 that behaviour is no longer enabled by default. See xref:deployment-guide:taking-solr-to-production.adoc#unknown-core-deletion[Unknown core deletion].
 
+=== use of timeAllowed
+* Query timeouts with `timeAllowed` are implemented differently.
+It should be faster albeit have less fidelity – will not timeout a query outside of core query processing (e.g. won't cancel spellcheck or faceting).
+Use `solr.useExitableDirectoryReader` to use the previous behavior.
+Please share your experience with Solr developers!
+The previous behavior should not be enabled if timeAllowed isn't used because unfortunately its performance tax is now imposed on all queries, even those without timeAllowed.
+
 === v2 API 
 * Solr's experimental "v2" API has seen a number of improvements in the 9.3 release.
 +