PERF: Better use of index when queueing a topci for search reindex.

Also move `Search::INDEX_VERSION` to `SearchIndexer` which is where the
version is actually being used.

app/jobs/scheduled/reindex_search.rb

@@ -71,7 +71,7 @@ module Jobs
     def load_problem_post_ids(limit)
       params = {
         locale: SiteSetting.default_locale,
-        version: Search::INDEX_VERSION,
+        version: SearchIndexer::INDEX_VERSION,
         limit: limit
       }
 
@@ -96,7 +96,7 @@ module Jobs
     def load_problem_category_ids(limit)
       Category.joins(:category_search_data)
         .where('category_search_data.locale != ?
-                OR category_search_data.version != ?', SiteSetting.default_locale, Search::INDEX_VERSION)
+                OR category_search_data.version != ?', SiteSetting.default_locale, SearchIndexer::INDEX_VERSION)
         .limit(limit)
         .pluck(:id)
     end
@@ -104,7 +104,7 @@ module Jobs
     def load_problem_topic_ids(limit)
       Topic.joins(:topic_search_data)
         .where('topic_search_data.locale != ?
-                OR topic_search_data.version != ?', SiteSetting.default_locale, Search::INDEX_VERSION)
+                OR topic_search_data.version != ?', SiteSetting.default_locale, SearchIndexer::INDEX_VERSION)
         .limit(limit)
         .pluck(:id)
     end
@@ -112,7 +112,7 @@ module Jobs
     def load_problem_user_ids(limit)
       User.joins(:user_search_data)
         .where('user_search_data.locale != ?
-                OR user_search_data.version != ?', SiteSetting.default_locale, Search::INDEX_VERSION)
+                OR user_search_data.version != ?', SiteSetting.default_locale, SearchIndexer::INDEX_VERSION)
         .limit(limit)
         .pluck(:id)
     end
@@ -120,7 +120,7 @@ module Jobs
     def load_problem_tag_ids(limit)
       Tag.joins(:tag_search_data)
         .where('tag_search_data.locale != ?
-                OR tag_search_data.version != ?', SiteSetting.default_locale, Search::INDEX_VERSION)
+                OR tag_search_data.version != ?', SiteSetting.default_locale, SearchIndexer::INDEX_VERSION)
         .limit(limit)
         .pluck(:id)
     end

app/services/search_indexer.rb

@@ -2,6 +2,8 @@
 require_dependency 'search'
 
 class SearchIndexer
+  INDEX_VERSION = 2
+  REINDEX_VERSION = 0
 
   def self.disable
     @disabled = true
@@ -61,7 +63,7 @@ class SearchIndexer
       raw_data: indexed_data,
       id: id,
       locale: SiteSetting.default_locale,
-      version: Search::INDEX_VERSION
+      version: INDEX_VERSION
     }
 
     # Would be nice to use AR here but not sure how to execut Postgres functions
@@ -116,10 +118,12 @@ class SearchIndexer
   def self.queue_post_reindex(topic_id)
     return if @disabled
 
-    DB.exec(<<~SQL, topic_id: topic_id)
+    DB.exec(<<~SQL, topic_id: topic_id, version: REINDEX_VERSION)
       UPDATE post_search_data
-      SET version = 0
-      WHERE post_id IN (SELECT id FROM posts WHERE topic_id = :topic_id)
+      SET version = :version
+      FROM posts
+      WHERE post_search_data.post_id = posts.id
+      AND posts.topic_id = :topic_id
     SQL
   end
 

lib/search.rb

@@ -1,7 +1,6 @@
 require_dependency 'search/grouped_search_results'
 
 class Search
-  INDEX_VERSION = 2.freeze
   DIACRITICS ||= /([\u0300-\u036f]|[\u1AB0-\u1AFF]|[\u1DC0-\u1DFF]|[\u20D0-\u20FF])/
 
   cattr_accessor :preloaded_topic_custom_fields

spec/jobs/reindex_search_spec.rb

@@ -25,7 +25,7 @@ describe Jobs::ReindexSearch do
       model.reload
 
       subject.execute({})
-      expect(model.send("#{m}_search_data").version).to eq Search::INDEX_VERSION
+      expect(model.send("#{m}_search_data").version).to eq SearchIndexer::INDEX_VERSION
     end
   end
 

spec/services/search_indexer_spec.rb

@@ -3,6 +3,14 @@ require 'rails_helper'
 describe SearchIndexer do
   let(:post_id) { 99 }
 
+  before do
+    SearchIndexer.enable
+  end
+
+  after do
+    SearchIndexer.disable
+  end
+
   def scrub(html, strip_diacritics: false)
     SearchIndexer.scrub_html_for_search(html, strip_diacritics: strip_diacritics)
   end
@@ -75,7 +83,7 @@ describe SearchIndexer do
     raw_data, locale, version = PostSearchData.where(post_id: post_id).pluck(:raw_data, :locale, :version)[0]
     expect(raw_data).to eq("This is a test")
     expect(locale).to eq("en")
-    expect(version).to eq(Search::INDEX_VERSION)
+    expect(version).to eq(SearchIndexer::INDEX_VERSION)
 
     SearchIndexer.update_posts_index(post_id, "tester", "", nil, nil)
 
@@ -86,14 +94,6 @@ describe SearchIndexer do
   describe '.index' do
     let(:post) { Fabricate(:post) }
 
-    before do
-      SearchIndexer.enable
-    end
-
-    after do
-      SearchIndexer.disable
-    end
-
     it 'should index posts correctly' do
       expect { post }.to change { PostSearchData.count }.by(1)
 
@@ -153,4 +153,23 @@ describe SearchIndexer do
       )
     end
   end
+
+  describe '.queue_post_reindex' do
+    let(:post) { Fabricate(:post) }
+    let(:topic) { post.topic }
+
+    it 'should reset the version of search data for all posts in the topic' do
+      post2 = Fabricate(:post)
+
+      SearchIndexer.queue_post_reindex(topic.id)
+
+      expect(post.reload.post_search_data.version).to eq(
+        SearchIndexer::REINDEX_VERSION
+      )
+
+      expect(post2.reload.post_search_data.version).to eq(
+        SearchIndexer::INDEX_VERSION
+      )
+    end
+  end
 end