danielcweeks commented on code in PR #16235:
URL: https://github.com/apache/iceberg/pull/16235#discussion_r3470581476


##########
aws/src/main/java/org/apache/iceberg/aws/s3/S3FileIOProperties.java:
##########
@@ -1197,4 +1209,63 @@ private <T> T loadSdkPluginConfigurations(String impl, 
Map<String, String> prope
   public Map<String, String> properties() {
     return allProperties;
   }
+
+  public String metricsPublisherImpl() {
+    return metricsPublisherImpl;
+  }
+
+  /**
+   * Configure a custom {@link MetricPublisher} for an S3 client.
+   *
+   * <p>Sample usage:
+   *
+   * <pre>
+   *     
S3Client.builder().applyMutation(s3FileIOProperties::applyMetricsPublisherConfiguration)
+   * </pre>
+   */
+  public <T extends S3BaseClientBuilder<T, ?>> void 
applyMetricsPublisherConfiguration(T builder) {
+    if (metricsPublisherImpl != null) {
+      ClientOverrideConfiguration.Builder configBuilder =
+          null != builder.overrideConfiguration()
+              ? builder.overrideConfiguration().toBuilder()
+              : ClientOverrideConfiguration.builder();
+      builder.overrideConfiguration(
+          configBuilder.addMetricPublisher(loadMetricPublisher()).build());
+    }
+  }
+
+  private MetricPublisher loadMetricPublisher() {
+    // Phase 1: look up the factory. A NoSuchMethodException here means the 
class does not
+    // declare `create(Map)` — fall back to the no-arg constructor path. Any 
OTHER exception
+    // from a factory that DOES exist (e.g. the factory itself throws) should 
surface via the
+    // wrapping IllegalArgumentException in phase 2 so users can distinguish 
"wrong signature"
+    // from "misconfigured factory".
+    DynMethods.StaticMethod factory = null;
+    try {
+      factory =
+          DynMethods.builder("create")
+              .hiddenImpl(metricsPublisherImpl, Map.class)
+              .buildStaticChecked();

Review Comment:
   Why are we expecting a `create(Map)` method to exist here?  Looking at the 
implementations provided by the SDKv2, two of the three have `create()` (no 
params) and non support one with a map of properties.



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