kamaci commented on a change in pull request #6662: Double-checked locking bugs
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r237034277
 
 

 ##########
 File path: 
aws-common/src/main/java/org/apache/druid/common/aws/LazyFileSessionCredentialsProvider.java
 ##########
 @@ -32,14 +32,10 @@ public 
LazyFileSessionCredentialsProvider(AWSCredentialsConfig config)
     this.config = config;
   }
 
-  private FileSessionCredentialsProvider getUnderlyingProvider()
+  private synchronized FileSessionCredentialsProvider getUnderlyingProvider()
 
 Review comment:
   @gianm synchronized on a final field within a synchronized method seems 
doesn't necessary?

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