leventov commented on a change in pull request #6662: Double-checked locking
bugs
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r237815901
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File path:
aws-common/src/main/java/org/apache/druid/common/aws/LazyFileSessionCredentialsProvider.java
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@@ -32,14 +32,10 @@ public
LazyFileSessionCredentialsProvider(AWSCredentialsConfig config)
this.config = config;
}
- private FileSessionCredentialsProvider getUnderlyingProvider()
+ private synchronized FileSessionCredentialsProvider getUnderlyingProvider()
Review comment:
You need to re-read the field into the local variable inside the
synchronized block. That's the whole point of double-checked locking.
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