[S3 Repository] Change default retry mechanism of s3 clients to Standard Mode

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add _list/indices API as paginated alternate to _cat/indices ([#14718](https://github.com/opensearch-project/OpenSearch/pull/14718))
 - Add success and failure metrics for async shard fetch ([#15976](https://github.com/opensearch-project/OpenSearch/pull/15976))
 - Add new metric REMOTE_STORE to NodeStats API response ([#15611](https://github.com/opensearch-project/OpenSearch/pull/15611))
+- [S3 Repository] Change default retry mechanism of s3 clients to Standard Mode ([#15978](https://github.com/opensearch-project/OpenSearch/pull/15978))
 
 ### Dependencies
 - Bump `com.azure:azure-identity` from 1.13.0 to 1.13.2 ([#15578](https://github.com/opensearch-project/OpenSearch/pull/15578))

plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3AsyncService.java

@@ -18,6 +18,7 @@
 import software.amazon.awssdk.core.client.config.ClientAsyncConfiguration;
 import software.amazon.awssdk.core.client.config.ClientOverrideConfiguration;
 import software.amazon.awssdk.core.client.config.SdkAdvancedAsyncClientOption;
+import software.amazon.awssdk.core.retry.RetryMode;
 import software.amazon.awssdk.core.retry.RetryPolicy;
 import software.amazon.awssdk.core.retry.backoff.BackoffStrategy;
 import software.amazon.awssdk.http.async.SdkAsyncHttpClient;
@@ -239,7 +240,9 @@
                 RetryPolicy.builder()
                     .numRetries(clientSettings.maxRetries)
                     .throttlingBackoffStrategy(
-                        clientSettings.throttleRetries ? BackoffStrategy.defaultThrottlingStrategy() : BackoffStrategy.none()
+                        clientSettings.throttleRetries
+                            ? BackoffStrategy.defaultThrottlingStrategy(RetryMode.STANDARD)
+                            : BackoffStrategy.none()
                     )
                     .build()
             )

plugins/repository-s3/src/main/java/org/opensearch/repositories/s3/S3Service.java

@@ -42,6 +42,7 @@
 import software.amazon.awssdk.core.client.config.ClientOverrideConfiguration;
 import software.amazon.awssdk.core.client.config.SdkAdvancedClientOption;
 import software.amazon.awssdk.core.exception.SdkException;
+import software.amazon.awssdk.core.retry.RetryMode;
 import software.amazon.awssdk.core.retry.RetryPolicy;
 import software.amazon.awssdk.core.retry.backoff.BackoffStrategy;
 import software.amazon.awssdk.http.SystemPropertyTlsKeyManagersProvider;
@@ -330,6 +331,8 @@ static ClientOverrideConfiguration buildOverrideConfiguration(final S3ClientSett
         );
         if (!clientSettings.throttleRetries) {
             retryPolicy.throttlingBackoffStrategy(BackoffStrategy.none());
+        } else {
+            retryPolicy.throttlingBackoffStrategy(BackoffStrategy.defaultThrottlingStrategy(RetryMode.STANDARD));
         }
         return clientOverrideConfiguration.retryPolicy(retryPolicy.build()).build();
     }

plugins/repository-s3/src/test/java/org/opensearch/repositories/s3/AwsS3ServiceImplTests.java

@@ -35,6 +35,7 @@
 import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
 import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
 import software.amazon.awssdk.core.client.config.ClientOverrideConfiguration;
+import software.amazon.awssdk.core.retry.RetryMode;
 import software.amazon.awssdk.core.retry.backoff.BackoffStrategy;
 import software.amazon.awssdk.http.apache.ProxyConfiguration;
 
@@ -364,7 +365,7 @@ private void launchAWSConfigurationTest(
         if (expectedUseThrottleRetries) {
             assertThat(
                 clientOverrideConfiguration.retryPolicy().get().throttlingBackoffStrategy(),
-                is(BackoffStrategy.defaultThrottlingStrategy())
+                is(BackoffStrategy.defaultThrottlingStrategy(RetryMode.STANDARD))
             );
         } else {
             assertThat(clientOverrideConfiguration.retryPolicy().get().throttlingBackoffStrategy(), is(BackoffStrategy.none()));