Add recovery chunk size setting

server/src/internalClusterTest/java/org/opensearch/indices/recovery/IndexRecoveryIT.java

@@ -278,7 +278,7 @@ private void restoreRecoverySpeed() {
                 .setTransientSettings(
                     Settings.builder()
                         .put(RecoverySettings.INDICES_RECOVERY_MAX_BYTES_PER_SEC_SETTING.getKey(), "20mb")
-                        .put(CHUNK_SIZE_SETTING.getKey(), RecoverySettings.DEFAULT_CHUNK_SIZE)
+                        .put(CHUNK_SIZE_SETTING.getKey(), RecoverySettings.INDICES_RECOVERY_CHUNK_SIZE_SETTING.getDefault(Settings.EMPTY))
                 )
                 .get()
                 .isAcknowledged()

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

@@ -306,6 +306,7 @@ public void apply(Settings value, Settings current, Settings previous) {
                 RecoverySettings.INDICES_RECOVERY_MAX_CONCURRENT_OPERATIONS_SETTING,
                 RecoverySettings.INDICES_RECOVERY_MAX_CONCURRENT_REMOTE_STORE_STREAMS_SETTING,
                 RecoverySettings.INDICES_INTERNAL_REMOTE_UPLOAD_TIMEOUT,
+                RecoverySettings.INDICES_RECOVERY_CHUNK_SIZE_SETTING,
                 ThrottlingAllocationDecider.CLUSTER_ROUTING_ALLOCATION_NODE_INITIAL_PRIMARIES_RECOVERIES_SETTING,
                 ThrottlingAllocationDecider.CLUSTER_ROUTING_ALLOCATION_NODE_INITIAL_REPLICAS_RECOVERIES_SETTING,
                 ThrottlingAllocationDecider.CLUSTER_ROUTING_ALLOCATION_NODE_CONCURRENT_INCOMING_RECOVERIES_SETTING,

server/src/main/java/org/opensearch/indices/recovery/RecoverySettings.java

@@ -177,7 +177,14 @@ public class RecoverySettings {
     );
 
     // choose 512KB-16B to ensure that the resulting byte[] is not a humongous allocation in G1.
-    public static final ByteSizeValue DEFAULT_CHUNK_SIZE = new ByteSizeValue(512 * 1024 - 16, ByteSizeUnit.BYTES);
+    public static final Setting<ByteSizeValue> INDICES_RECOVERY_CHUNK_SIZE_SETTING = Setting.byteSizeSetting(
+        "indices.recovery.chunk_size",
+        new ByteSizeValue(512 * 1024 - 16, ByteSizeUnit.BYTES),
+        new ByteSizeValue(0, ByteSizeUnit.BYTES),
+        new ByteSizeValue(100 * 1024 * 1024, ByteSizeUnit.BYTES),
+        Property.Dynamic,
+        Property.NodeScope
+    );
 
     private volatile ByteSizeValue recoveryMaxBytesPerSec;
     private volatile ByteSizeValue replicationMaxBytesPerSec;
@@ -193,7 +200,7 @@ public class RecoverySettings {
     private volatile TimeValue internalActionRetryTimeout;
     private volatile TimeValue internalActionLongTimeout;
 
-    private volatile ByteSizeValue chunkSize = DEFAULT_CHUNK_SIZE;
+    private volatile ByteSizeValue chunkSize;
     private volatile TimeValue internalRemoteUploadTimeout;
 
     public RecoverySettings(Settings settings, ClusterSettings clusterSettings) {
@@ -221,6 +228,7 @@ public RecoverySettings(Settings settings, ClusterSettings clusterSettings) {
 
         logger.debug("using recovery max_bytes_per_sec[{}]", recoveryMaxBytesPerSec);
         this.internalRemoteUploadTimeout = INDICES_INTERNAL_REMOTE_UPLOAD_TIMEOUT.get(settings);
+        this.chunkSize = INDICES_RECOVERY_CHUNK_SIZE_SETTING.get(settings);
 
         clusterSettings.addSettingsUpdateConsumer(INDICES_RECOVERY_MAX_BYTES_PER_SEC_SETTING, this::setRecoveryMaxBytesPerSec);
         clusterSettings.addSettingsUpdateConsumer(INDICES_REPLICATION_MAX_BYTES_PER_SEC_SETTING, this::setReplicationMaxBytesPerSec);
@@ -239,7 +247,7 @@ public RecoverySettings(Settings settings, ClusterSettings clusterSettings) {
         );
         clusterSettings.addSettingsUpdateConsumer(INDICES_RECOVERY_ACTIVITY_TIMEOUT_SETTING, this::setActivityTimeout);
         clusterSettings.addSettingsUpdateConsumer(INDICES_INTERNAL_REMOTE_UPLOAD_TIMEOUT, this::setInternalRemoteUploadTimeout);
-
+        clusterSettings.addSettingsUpdateConsumer(INDICES_RECOVERY_CHUNK_SIZE_SETTING, this::setChunkSize);
     }
 
     public RateLimiter recoveryRateLimiter() {
@@ -282,10 +290,7 @@ public ByteSizeValue getChunkSize() {
         return chunkSize;
     }
 
-    public void setChunkSize(ByteSizeValue chunkSize) { // only settable for tests
-        if (chunkSize.bytesAsInt() <= 0) {
-            throw new IllegalArgumentException("chunkSize must be > 0");
-        }
+    public void setChunkSize(ByteSizeValue chunkSize) {
         this.chunkSize = chunkSize;
     }
 

server/src/test/java/org/opensearch/indices/recovery/RecoverySettingsDynamicUpdateTests.java

@@ -118,4 +118,13 @@ public void testInternalLongActionTimeout() {
         );
         assertEquals(new TimeValue(duration, timeUnit), recoverySettings.internalActionLongTimeout());
     }
+
+    public void testChunkSize() {
+        ByteSizeValue chunkSize = new ByteSizeValue(between(1, 1000), ByteSizeUnit.BYTES);
+        clusterSettings.applySettings(
+            Settings.builder().put(RecoverySettings.INDICES_RECOVERY_CHUNK_SIZE_SETTING.getKey(), chunkSize).build()
+        );
+        assertEquals(chunkSize, recoverySettings.getChunkSize());
+    }
+
 }

test/framework/src/main/java/org/opensearch/index/shard/IndexShardTestCase.java

@@ -1148,7 +1148,7 @@ public final void recoverUnstartedReplica(
             startingSeqNo
         );
         long fileChunkSizeInBytes = randomBoolean()
-            ? RecoverySettings.DEFAULT_CHUNK_SIZE.getBytes()
+            ? RecoverySettings.INDICES_RECOVERY_CHUNK_SIZE_SETTING.getDefault(Settings.EMPTY).getBytes()
             : randomIntBetween(1, 10 * 1024 * 1024);
         final Settings settings = Settings.builder()
             .put("indices.recovery.max_concurrent_file_chunks", Integer.toString(between(1, 4)))

test/framework/src/main/java/org/opensearch/node/RecoverySettingsChunkSizePlugin.java

@@ -51,7 +51,7 @@ public class RecoverySettingsChunkSizePlugin extends Plugin {
      */
     public static final Setting<ByteSizeValue> CHUNK_SIZE_SETTING = Setting.byteSizeSetting(
         "indices.recovery.chunk_size",
-        RecoverySettings.DEFAULT_CHUNK_SIZE,
+        RecoverySettings.INDICES_RECOVERY_CHUNK_SIZE_SETTING,
         Property.Dynamic,
         Property.NodeScope
     );