leventov commented on a change in pull request #6662: Double-checked locking
bugs
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r238478552
##########
File path:
aws-common/src/main/java/org/apache/druid/common/aws/LazyFileSessionCredentialsProvider.java
##########
@@ -22,10 +22,19 @@
import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.AWSCredentialsProvider;
+import javax.annotation.Nullable;
+
public class LazyFileSessionCredentialsProvider implements
AWSCredentialsProvider
{
- private AWSCredentialsConfig config;
- private FileSessionCredentialsProvider provider;
+ private final AWSCredentialsConfig config;
+
+ /**
+ * The field is declared volatile in order to ensure safe publication of the
object
+ * in {@link #getUnderlyingProvider()} without worrying about final modifiers
+ * on the fields of the created object
+ */
+ @Nullable
Review comment:
Still `@Nullable`
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