SOLR-11200: A new CMS config option 'ioThrottle' to manually enable/disable ConcurrentMergeSchedule.doAutoIOThrottle. (Amrit Sarkar, Nawab Zada Asad iqbal)

solr/CHANGES.txt

@@ -69,6 +69,9 @@ Upgrade Notes
 New Features
 ----------------------
 
+* SOLR-11200: A new CMS config option 'ioThrottle' to manually enable/disable 
+  ConcurrentMergeSchedule.doAutoIOThrottle. (Amrit Sarkar, Nawab Zada Asad iqbal via Dawid Weiss)
+
 * SOLR-11670: Implement a periodic house-keeping task. This uses a scheduled autoscaling trigger and
   currently performs cleanup of old inactive shards. (ab, shalin)
 

solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java

@@ -299,6 +299,10 @@ public class SolrIndexConfig implements MapSerializable {
           maxThreadCount = ((ConcurrentMergeScheduler) scheduler).getMaxThreadCount();
         }
         ((ConcurrentMergeScheduler)scheduler).setMaxMergesAndThreads(maxMergeCount, maxThreadCount);
+        Boolean ioThrottle = (Boolean) args.remove("ioThrottle");
+        if (ioThrottle != null && !ioThrottle) { //by-default 'enabled'
+            ((ConcurrentMergeScheduler) scheduler).disableAutoIOThrottle();
+        }
         SolrPluginUtils.invokeSetters(scheduler, args);
       } else {
         SolrPluginUtils.invokeSetters(scheduler, mergeSchedulerInfo.initArgs);

solr/core/src/test-files/solr/collection1/conf/solrconfig-concurrentmergescheduler.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" ?>
+
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements.  See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License.  You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+
+<config>
+  <luceneMatchVersion>${tests.luceneMatchVersion:LATEST}</luceneMatchVersion>
+  <directoryFactory name="DirectoryFactory" class="${solr.directoryFactory:solr.RAMDirectoryFactory}"/>
+  <schemaFactory class="ClassicIndexSchemaFactory"/>
+
+  <indexConfig>
+    <useCompoundFile>${useCompoundFile:false}</useCompoundFile>
+    <mergePolicyFactory class="org.apache.solr.index.TieredMergePolicyFactory" />
+    <mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler">
+      <int name="maxMergeCount">987</int>
+      <int name="maxThreadCount">42</int>
+      <bool name="ioThrottle">false</bool>
+    </mergeScheduler>
+  </indexConfig>
+
+  <requestHandler name="/select" class="solr.SearchHandler"></requestHandler>
+
+</config>

solr/core/src/test/org/apache/solr/update/SolrIndexConfigTest.java

@@ -48,6 +48,7 @@ public class SolrIndexConfigTest extends SolrTestCaseJ4 {
   private static final String solrConfigFileName = "solrconfig.xml";
   private static final String solrConfigFileNameWarmerRandomMergePolicyFactory = "solrconfig-warmer-randommergepolicyfactory.xml";
   private static final String solrConfigFileNameTieredMergePolicyFactory = "solrconfig-tieredmergepolicyfactory.xml";
+  private static final String solrConfigFileNameConnMSPolicyFactory = "solrconfig-concurrentmergescheduler.xml";
   private static final String solrConfigFileNameSortingMergePolicyFactory = "solrconfig-sortingmergepolicyfactory.xml";
   private static final String schemaFileName = "schema.xml";
 
@@ -93,6 +94,29 @@ public class SolrIndexConfigTest extends SolrTestCaseJ4 {
     ConcurrentMergeScheduler ms = (ConcurrentMergeScheduler)  iwc.getMergeScheduler();
     assertEquals("ms.maxMergeCount", 987, ms.getMaxMergeCount());
     assertEquals("ms.maxThreadCount", 42, ms.getMaxThreadCount());
+    assertEquals("ms.isAutoIOThrottle", true, ms.getAutoIOThrottle());
+
+  }
+
+  @Test
+  public void testConcurrentMergeSchedularSolrIndexConfigCreation() throws Exception {
+    String solrConfigFileName = solrConfigFileNameConnMSPolicyFactory;
+    SolrConfig solrConfig = new SolrConfig(instanceDir, solrConfigFileName, null);
+    SolrIndexConfig solrIndexConfig = new SolrIndexConfig(solrConfig, null, null);
+    IndexSchema indexSchema = IndexSchemaFactory.buildIndexSchema(schemaFileName, solrConfig);
+
+    h.getCore().setLatestSchema(indexSchema);
+    IndexWriterConfig iwc = solrIndexConfig.toIndexWriterConfig(h.getCore());
+
+    assertNotNull("null mp", iwc.getMergePolicy());
+    assertTrue("mp is not TieredMergePolicy", iwc.getMergePolicy() instanceof TieredMergePolicy);
+
+    assertNotNull("null ms", iwc.getMergeScheduler());
+    assertTrue("ms is not CMS", iwc.getMergeScheduler() instanceof ConcurrentMergeScheduler);
+    ConcurrentMergeScheduler ms = (ConcurrentMergeScheduler)  iwc.getMergeScheduler();
+    assertEquals("ms.maxMergeCount", 987, ms.getMaxMergeCount());
+    assertEquals("ms.maxThreadCount", 42, ms.getMaxThreadCount());
+    assertEquals("ms.isAutoIOThrottle", false, ms.getAutoIOThrottle());
 
   }