szetszwo commented on PR #5398:
URL: https://github.com/apache/ozone/pull/5398#issuecomment-1841711841
@vtutrinov , thanks for working on this which is a very good performance
improvement!
Indeed, we could generate the `byte[]` directly instead of generating an
`UUID` and then convert it to `byte[]`. We could also get ride of the
`java-uuid-generator` dependency.
```java
+++ b/hadoop-hdds/common/src/main/java/org/apache/hadoop/util/UUIDUtil.java
@@ -15,13 +15,9 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-
package org.apache.hadoop.util;
-import com.fasterxml.uuid.Generators;
-
import java.security.SecureRandom;
-import java.util.UUID;
/**
* Helper methods to deal with random UUIDs.
@@ -35,8 +31,14 @@ private UUIDUtil() {
private static final ThreadLocal<SecureRandom> GENERATOR =
ThreadLocal.withInitial(SecureRandom::new);
- public static UUID randomUUID() {
- return Generators.randomBasedGenerator(GENERATOR.get()).generate();
+ public static byte[] randomUuidBytes() {
+ final byte[] bytes = new byte[16];
+ GENERATOR.get().nextBytes(bytes);
+ // See RFC 4122 section 4.4
+ bytes[6] &= 0x0f;
+ bytes[6] |= 0x40;
+ bytes[8] &= 0x3f;
+ bytes[8] |= 0x80;
+ return bytes;
}
-
}
```
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