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houston pushed a commit to branch branch_9x
in repository https://gitbox.apache.org/repos/asf/solr.git
The following commit(s) were added to refs/heads/branch_9x by this push:
new 24a7753cbd7 SOLR-17673: Disable multithreaded search at the node level
by default (#3183)
24a7753cbd7 is described below
commit 24a7753cbd7078bacc4dea1b104edc03362b087e
Author: Houston Putman <[email protected]>
AuthorDate: Fri Feb 14 12:01:34 2025 -0600
SOLR-17673: Disable multithreaded search at the node level by default
(#3183)
(cherry picked from commit 970c1fb98ffd31e1bb5ed6d1a33d6baaa96d1627)
---
solr/CHANGES.txt | 4 ++++
solr/core/src/java/org/apache/solr/core/NodeConfig.java | 3 +--
.../modules/upgrade-notes/pages/major-changes-in-solr-9.adoc | 6 ++++++
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 1d5b77765e1..7dede6a34ae 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -53,6 +53,10 @@ Bug Fixes
* SOLR-17630: Added a node-wide CloudSolrClient to ZkController, and
accessible via SolrCloudManager too.
Uses Jetty HttpClient. Deprecated CloudSolrClient.getSolrClientCache.
Redirected some callers. (David Smiley)
+* SOLR-17673: Disable multi-threaded search execution by default at the
node-level.
+ Users can still opt-in by providing a "indexSearcherExecutorThreads" > 0.
+ (Houston Putman, Varun Thacker, David Smiley, Luke Kot-Zaniewski)
+
Dependency Upgrades
---------------------
* SOLR-17471: Upgrade Lucene to 9.12.1. (Pierre Salagnac, Christine Poerschke)
diff --git a/solr/core/src/java/org/apache/solr/core/NodeConfig.java
b/solr/core/src/java/org/apache/solr/core/NodeConfig.java
index da9fb3a4262..67c71839436 100644
--- a/solr/core/src/java/org/apache/solr/core/NodeConfig.java
+++ b/solr/core/src/java/org/apache/solr/core/NodeConfig.java
@@ -679,8 +679,7 @@ public class NodeConfig {
// No:of core load threads in cloud mode is set to a default of 8
public static final int DEFAULT_CORE_LOAD_THREADS_IN_CLOUD = 8;
- public static final int DEFAULT_INDEX_SEARCHER_EXECUTOR_THREADS =
- Runtime.getRuntime().availableProcessors();
+ public static final int DEFAULT_INDEX_SEARCHER_EXECUTOR_THREADS = 0;
private static final String DEFAULT_CORESLOCATORCLASS =
"org.apache.solr.core.CorePropertiesLocator";
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 15d314b3e88..05165cb63a2 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
@@ -67,6 +67,12 @@ It is always strongly recommended that you fully reindex
your documents after a
In Solr 8, it was possible to add docValues to a schema without re-indexing
via `UninvertDocValuesMergePolicy`, an advanced/expert utility.
Due to changes in Lucene 9, that isn't possible any more.
+== Solr 9.8.1
+=== Configuration
+In solrconfig.xml, the `indexSearcherExecutorThreads` now defaults to 0.
+Therefore, multi-threaded search execution is disabled at a node-level by
default.
+It is currently recommended to only use an `indexSearcherExecutorThreads > 0`
if all query requests sent to Solr opt-in to multiThreaded search.
+
== Solr 9.8
=== Configuration
In solrconfig.xml, the `numVersionBuckets` and `versionBucketLockTimeoutMs`
settings are now obsolete and ignored; a warning will be logged if specified.
