YARN-7320. Duplicate LiteralByteStrings in SystemCredentialsForAppsProto.credentialsForApp_ Addendum (misha@cloudera.com via rkanter)

(cherry picked from commit 088ffee7165d0e2e4fb9af7fb8f33626b0ed8ed3)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/api/protocolrecords/impl/pb/NodeHeartbeatResponsePBImpl.java

@@ -156,7 +156,7 @@ public class NodeHeartbeatResponsePBImpl extends NodeHeartbeatResponse {
       builder.addSystemCredentialsForApps(SystemCredentialsForAppsProto.newBuilder()
         .setAppId(convertToProtoFormat(entry.getKey()))
         .setCredentialsForApp(BYTE_STRING_INTERNER.intern(
-            ProtoUtils.convertToProtoFormat(entry.getValue()))));
+            ProtoUtils.convertToProtoFormat(entry.getValue().duplicate()))));
     }
   }