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

[ds...@apache.org]

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


The following commit(s) were added to refs/heads/main by this push:
     new f896ad9c1fc SOLR-16693: upgrade notes (#1803)
f896ad9c1fc is described below

commit f896ad9c1fc076f193125409f1d3aac099a526ce
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 c380fa78048..e1cd003fc69 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
@@ -117,6 +117,13 @@ 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.
 +