duongkame commented on code in PR #4433:
URL: https://github.com/apache/ozone/pull/4433#discussion_r1142501710
##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/security/AWSV4AuthValidator.java:
##########
@@ -43,6 +43,20 @@ final class AWSV4AuthValidator {
private AWSV4AuthValidator() {
}
+ /**
+ * ThreadLocal cache of Mac instances.
+ */
+ private static final ThreadLocal<Mac> THREAD_LOCAL_MAC =
+ ThreadLocal.withInitial(() -> {
+ try {
+ return Mac.getInstance(HMAC_SHA256_ALGORITHM);
+ } catch (NoSuchAlgorithmException nsa) {
+ throw new IllegalArgumentException(
+ "Failed to initialize Mac instance that implements the " +
+ HMAC_SHA256_ALGORITHM + " algorithm" + nsa);
Review Comment:
```suggestion
"Failed to initialize Mac instance that implements the " +
HMAC_SHA256_ALGORITHM + " algorithm.", nsa);
```
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