diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
index 3f360d764c..64b49c86b4 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ProtoUtils.java
@@ -412,7 +412,7 @@ public static ContainerUpdateType convertFromProtoFormat(
   /*
    * Resource
    */
-  public static synchronized ResourceProto convertToProtoFormat(Resource r) {
+  public static ResourceProto convertToProtoFormat(Resource r) {
     return ResourcePBImpl.getProto(r);
   }
 
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
index 36fc959cbb..ed9f3dbb8c 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/ResourcePBImpl.java
@@ -75,14 +75,14 @@ public ResourcePBImpl(ResourceProto proto) {
     initResources();
   }
 
-  public ResourceProto getProto() {
+  synchronized public ResourceProto getProto() {
     mergeLocalToProto();
     proto = viaProto ? proto : builder.build();
     viaProto = true;
     return proto;
   }
 
-  private void maybeInitBuilder() {
+  synchronized private void maybeInitBuilder() {
     if (viaProto || builder == null) {
       builder = ResourceProto.newBuilder(proto);
     }
@@ -131,7 +131,7 @@ public void setVirtualCores(int vCores) {
     resources[VCORES_INDEX].setValue(vCores);
   }
 
-  private void initResources() {
+  synchronized private void initResources() {
     if (this.resources != null) {
       return;
     }