leventov commented on a change in pull request #6662: Double-checked locking
bugs
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r237817058
##########
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:
Also since `volatile` you don't need that "safely initialized" comment on
the field write line, but you need to write a similar comment on the field
declaration, saying that the field is declared volatile in order to ensure safe
publication of the object without worrying about final modifiers on the fields
of the created object.
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