danielcweeks commented on code in PR #13215:
URL: https://github.com/apache/iceberg/pull/13215#discussion_r2195272150


##########
aws/src/main/java/org/apache/iceberg/aws/s3/signer/S3V4RestSignerClient.java:
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@@ -76,15 +80,25 @@ public abstract class S3V4RestSignerClient
 
   private static final String SCOPE = "sign";
 
-  @SuppressWarnings("immutables:incompat")
-  private volatile AuthManager authManager;
+  @SuppressWarnings({"immutables:incompat", "VisibilityModifier"})
+  @VisibleForTesting
+  static volatile AuthManager authManager;
 
   @SuppressWarnings({"immutables:incompat", "VisibilityModifier"})
   @VisibleForTesting
   static volatile RESTClient httpClient;
 
-  @SuppressWarnings("immutables:incompat")
-  private volatile AuthSession authSession;
+  @SuppressWarnings("ShutdownHook")
+  private static void installShutdownHook() {

Review Comment:
   I don't think we're making the situation here any worse and I find shutdown 
hooks not a great solution because we're adding complexity and still not 
shutting them down based on when they're no longer necessary, but rather when 
you're already exiting the jvm.



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