leventov commented on a change in pull request #6662: Double-checked locking
bugs
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r236668504
##########
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:
1) No `synchronized` on the method
2) There should be another check inside the `synchronized` block (because
currently it's not **double** checked locking :)
3) I would put the comment before the `provider = syncedProvider;` line:
```
// The provider field doesn't need to be volatile because
FileSessionCredentialsProvider
// is safely initialized because it contains a final field
sessionCredentials.
```
Added "The provider field doesn't need to be volatile" because that's what
specifically needs to be explained here.
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