virajjasani commented on PR #4722:
URL: https://github.com/apache/hadoop/pull/4722#issuecomment-1209772369

   > back when we did that the sts client shutdown just threw 
UnsupportedOperationException. is that no longer the case? if so, we should 
stop swallowing it in our STSClient
   
   That is true, we no longer need to catch `UnsupportedOperationException`. 
Based on the implementations that implement `AWSSecurityTokenService`, it seems 
that this Exception is now only thrown by `AbstractAWSSecurityTokenService`, 
which we don't use anyways.
   
   `AbstractAWSSecurityTokenService`:
   ```
       @Override
       public void shutdown() {
           throw new java.lang.UnsupportedOperationException();
       }
   
   ```
   
   `AWSSecurityTokenServiceAsyncClient`:
   ```
       @Override
       public void shutdown() {
           super.shutdown();
           executorService.shutdownNow();
       }
   
   ```
   
   `AWSSecurityTokenServiceClient`:
   ```
       @Override
       public void shutdown() {
           super.shutdown();
       }
   
   ```
   
   We are good here. Just ran all the tests against new commit. Sharing the 
test results in the next comment.


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