[segment replication] add SEGMENT_COUNTER_INCREMENT_STEP_SETTING and increase default step

server/src/main/java/org/opensearch/common/settings/IndexScopedSettings.java

@@ -222,6 +222,7 @@ public final class IndexScopedSettings extends AbstractScopedSettings {
                 LogByteSizeMergePolicyProvider.INDEX_LBS_MAX_MERGED_DOCS_SETTING,
                 LogByteSizeMergePolicyProvider.INDEX_LBS_NO_CFS_RATIO_SETTING,
                 IndexSettings.DEFAULT_SEARCH_PIPELINE,
+                IndexSettings.SEGMENT_COUNTER_INCREMENT_STEP_SETTING,
 
                 // Settings for Searchable Snapshots
                 IndexSettings.SEARCHABLE_SNAPSHOT_REPOSITORY,

server/src/main/java/org/opensearch/index/IndexSettings.java

@@ -782,6 +782,14 @@
         Property.IndexScope
     );
 
+    public static final Setting<Long> SEGMENT_COUNTER_INCREMENT_STEP_SETTING = Setting.longSetting(
+        "index.segment_counter_increment_step",
+        100000,
+        10,
+        Property.Dynamic,
+        Property.IndexScope
+    );
+
     private final Index index;
     private final Version version;
     private final Logger logger;
@@ -914,6 +922,7 @@
     private volatile double docIdFuzzySetFalsePositiveProbability;
 
     private final boolean isCompositeIndex;
+    private volatile long segmentCounterIncrementStep;
 
     /**
      * Returns the default search fields for this index.
@@ -1063,6 +1072,7 @@
         setMergeOnFlushPolicy(scopedSettings.get(INDEX_MERGE_ON_FLUSH_POLICY));
         checkPendingFlushEnabled = scopedSettings.get(INDEX_CHECK_PENDING_FLUSH_ENABLED);
         defaultSearchPipeline = scopedSettings.get(DEFAULT_SEARCH_PIPELINE);
+        segmentCounterIncrementStep = scopedSettings.get(SEGMENT_COUNTER_INCREMENT_STEP_SETTING);
         /* There was unintentional breaking change got introduced with [OpenSearch-6424](https://github.com/opensearch-project/OpenSearch/pull/6424) (version 2.7).
          * For indices created prior version (prior to 2.7) which has IndexSort type, they used to type cast the SortField.Type
          * to higher bytes size like integer to long. This behavior was changed from OpenSearch 2.7 version not to
@@ -1200,6 +1210,7 @@
             IndexMetadata.INDEX_REMOTE_TRANSLOG_REPOSITORY_SETTING,
             this::setRemoteStoreTranslogRepository
         );
+        scopedSettings.addSettingsUpdateConsumer(SEGMENT_COUNTER_INCREMENT_STEP_SETTING, this::setSegmentCounterIncrementStep);
     }
 
     private void setSearchIdleAfter(TimeValue searchIdleAfter) {
@@ -2034,4 +2045,12 @@
     public void setRemoteStoreTranslogRepository(String remoteStoreTranslogRepository) {
         this.remoteStoreTranslogRepository = remoteStoreTranslogRepository;
     }
+
+    public long getSegmentCounterIncrementStep() {
+        return segmentCounterIncrementStep;
+    }
+
+    public void setSegmentCounterIncrementStep(long segmentCounterIncrementStep) {
+        this.segmentCounterIncrementStep = segmentCounterIncrementStep;
+    }
 }

server/src/main/java/org/opensearch/index/engine/NRTReplicationEngine.java

@@ -67,8 +67,6 @@ public class NRTReplicationEngine extends Engine {
 
     private volatile long lastReceivedPrimaryGen = SequenceNumbers.NO_OPS_PERFORMED;
 
-    private static final int SI_COUNTER_INCREMENT = 10;
-
     public NRTReplicationEngine(EngineConfig engineConfig) {
         super(engineConfig);
         store.incRef();
@@ -443,7 +441,8 @@ protected final void closeNoLock(String reason, CountDownLatch closedLatch) {
                  */
                 if (engineConfig.getIndexSettings().isRemoteStoreEnabled() == false
                     && engineConfig.getIndexSettings().isAssignedOnRemoteNode() == false) {
-                    latestSegmentInfos.counter = latestSegmentInfos.counter + SI_COUNTER_INCREMENT;
+                    latestSegmentInfos.counter = latestSegmentInfos.counter + engineConfig.getIndexSettings()
+                        .getSegmentCounterIncrementStep();
                     latestSegmentInfos.changed();
                 }
                 try {