leventov commented on a change in pull request #6662: Double-checked locking
bug is fixed.
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r236308344
##########
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()
{
if (provider == null) {
- synchronized (config) {
- if (provider == null) {
- provider = new
FileSessionCredentialsProvider(config.getFileSessionCredentials());
- }
- }
+ provider = new
FileSessionCredentialsProvider(config.getFileSessionCredentials());
Review comment:
Please add `@Nullable` to the `provider` field
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