diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorApplyGradient.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorApplyGradient.pbtxt
new file mode 100644
index 00000000000..346a12b5997
--- /dev/null
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorApplyGradient.pbtxt
@@ -0,0 +1,33 @@
+op {
+  graph_op_name: "ResourceAccumulatorApplyGradient"
+  visibility: HIDDEN
+  in_arg {
+    name: "handle"
+    description: <<END
+The handle to a accumulator.
+END
+  }
+  in_arg {
+    name: "local_step"
+    description: <<END
+The local_step value at which the gradient was computed.
+END
+  }
+  in_arg {
+    name: "gradient"
+    description: <<END
+A tensor of the gradient to be accumulated.
+END
+  }
+  attr {
+    name: "dtype"
+    description: <<END
+The data type of accumulated gradients. Needs to correspond to the type
+of the accumulator.
+END
+  }
+  summary: "Applies a gradient to a given accumulator."
+  description: <<END
+Does not add if local_step is lesser than the accumulator's global_step.
+END
+}
diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorNumAccumulated.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorNumAccumulated.pbtxt
new file mode 100644
index 00000000000..4b77f1484dc
--- /dev/null
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorNumAccumulated.pbtxt
@@ -0,0 +1,17 @@
+op {
+  graph_op_name: "ResourceAccumulatorNumAccumulated"
+  visibility: HIDDEN
+  in_arg {
+    name: "handle"
+    description: <<END
+The handle to an accumulator.
+END
+  }
+  out_arg {
+    name: "num_accumulated"
+    description: <<END
+The number of gradients aggregated in the given accumulator.
+END
+  }
+  summary: "Returns the number of gradients aggregated in the given accumulators."
+}
diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorSetGlobalStep.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorSetGlobalStep.pbtxt
new file mode 100644
index 00000000000..5691b29433f
--- /dev/null
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorSetGlobalStep.pbtxt
@@ -0,0 +1,21 @@
+op {
+  graph_op_name: "ResourceAccumulatorSetGlobalStep"
+  visibility: HIDDEN
+  in_arg {
+    name: "handle"
+    description: <<END
+The handle to an accumulator.
+END
+  }
+  in_arg {
+    name: "new_global_step"
+    description: <<END
+The new global_step value to set.
+END
+  }
+  summary: "Updates the accumulator with a new value for global_step."
+  description: <<END
+Logs warning if the accumulator's value is already higher than
+new_global_step.
+END
+}
diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorTakeGradient.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorTakeGradient.pbtxt
new file mode 100644
index 00000000000..64b8053b73a
--- /dev/null
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceAccumulatorTakeGradient.pbtxt
@@ -0,0 +1,37 @@
+op {
+  graph_op_name: "ResourceAccumulatorTakeGradient"
+  visibility: HIDDEN
+  in_arg {
+    name: "handle"
+    description: <<END
+The handle to an accumulator.
+END
+  }
+  in_arg {
+    name: "num_required"
+    description: <<END
+Number of gradients required before we return an aggregate.
+END
+  }
+  out_arg {
+    name: "average"
+    description: <<END
+The average of the accumulated gradients.
+END
+  }
+  attr {
+    name: "dtype"
+    description: <<END
+The data type of accumulated gradients. Needs to correspond to the type
+of the accumulator.
+END
+  }
+  summary: "Extracts the average gradient in the given ConditionalAccumulator."
+  description: <<END
+The op blocks until sufficient (i.e., more than num_required)
+gradients have been accumulated.  If the accumulator has already
+aggregated more than num_required gradients, it returns the average of
+the accumulated gradients.  Also automatically increments the recorded
+global_step in the accumulator by 1, and resets the aggregate to 0.
+END
+}
diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceConditionalAccumulator.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceConditionalAccumulator.pbtxt
new file mode 100644
index 00000000000..fe4f3800a17
--- /dev/null
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceConditionalAccumulator.pbtxt
@@ -0,0 +1,47 @@
+op {
+  graph_op_name: "ResourceConditionalAccumulator"
+  visibility: HIDDEN
+  out_arg {
+    name: "handle"
+    description: <<END
+The handle to the accumulator.
+END
+  }
+  attr {
+    name: "dtype"
+    description: <<END
+The type of the value being accumulated.
+END
+  }
+  attr {
+    name: "shape"
+    description: <<END
+The shape of the values, can be [], in which case shape is unknown.
+END
+  }
+  attr {
+    name: "container"
+    description: <<END
+If non-empty, this accumulator is placed in the given container.
+Otherwise, a default container is used.
+END
+  }
+  attr {
+    name: "shared_name"
+    description: <<END
+If non-empty, this accumulator will be shared under the
+given name across multiple sessions.
+END
+  }
+  summary: "A conditional accumulator for aggregating gradients."
+  description: <<END
+The accumulator accepts gradients marked with local_step greater or
+equal to the most recent global_step known to the accumulator. The
+average can be extracted from the accumulator, provided sufficient
+gradients have been accumulated. Extracting the average automatically
+resets the aggregate to 0, and increments the global_step recorded by
+the accumulator.
+This is a resource version of ConditionalAccumulator that will work in TF2.0
+with tf.cond version 2.
+END
+}
diff --git a/tensorflow/core/kernels/conditional_accumulator_base_op.cc b/tensorflow/core/kernels/conditional_accumulator_base_op.cc
index 2c365a1e8ed..02a8b93ca43 100644
--- a/tensorflow/core/kernels/conditional_accumulator_base_op.cc
+++ b/tensorflow/core/kernels/conditional_accumulator_base_op.cc
@@ -30,10 +30,15 @@ class AccumulatorSetGlobalStepOp
       : ConditionalAccumulatorBaseSyncOpKernel(context) {}
 
  protected:
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_STRING_REF, DT_INT64};
+  }
+
   void Compute(OpKernelContext* ctx,
                ConditionalAccumulatorBase* accumulator) override {
     // Check signature
-    OP_REQUIRES_OK(ctx, ctx->MatchSignature({DT_STRING_REF, DT_INT64}, {}));
+    CheckSignature(ctx, accumulator);
 
     // Get input new_global_step
     const Tensor* new_global_step_tensor;
@@ -56,6 +61,24 @@ class AccumulatorSetGlobalStepOp
 REGISTER_KERNEL_BUILDER(Name("AccumulatorSetGlobalStep").Device(DEVICE_CPU),
                         AccumulatorSetGlobalStepOp);
 
+class ResourceAccumulatorSetGlobalStepOp : public AccumulatorSetGlobalStepOp {
+ public:
+  explicit ResourceAccumulatorSetGlobalStepOp(OpKernelConstruction* context)
+      : AccumulatorSetGlobalStepOp(context) {}
+
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_RESOURCE, DT_INT64};
+  }
+
+ private:
+  TF_DISALLOW_COPY_AND_ASSIGN(ResourceAccumulatorSetGlobalStepOp);
+};
+
+REGISTER_KERNEL_BUILDER(
+    Name("ResourceAccumulatorSetGlobalStep").Device(DEVICE_CPU),
+    ResourceAccumulatorSetGlobalStepOp);
+
 /**
  * Defines a AccumulatorNumAccumulatedOp, which returns the number of gradients
  * that have been accumulated in the given ConditionalAccumulator, and emits it
@@ -68,10 +91,23 @@ class AccumulatorNumAccumulatedOp
       : ConditionalAccumulatorBaseSyncOpKernel(context) {}
 
  protected:
+  void CheckSignature(OpKernelContext* ctx,
+                      ConditionalAccumulatorBase* accumulator) override {
+    // Check input signature
+    OP_REQUIRES_OK(
+        ctx, ctx->MatchSignature(GetExpectedInputs(accumulator), {DT_INT32}));
+  }
+
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_STRING_REF};
+  }
+
   void Compute(OpKernelContext* ctx,
                ConditionalAccumulatorBase* accumulator) override {
     // Check signature
-    OP_REQUIRES_OK(ctx, ctx->MatchSignature({DT_STRING_REF}, {DT_INT32}));
+    CheckSignature(ctx, accumulator);
+
     Tensor* Taccumulator_size = nullptr;
     OP_REQUIRES_OK(
         ctx, ctx->allocate_output(0, TensorShape({}), &Taccumulator_size));
@@ -86,4 +122,22 @@ class AccumulatorNumAccumulatedOp
 REGISTER_KERNEL_BUILDER(Name("AccumulatorNumAccumulated").Device(DEVICE_CPU),
                         AccumulatorNumAccumulatedOp);
 
+class ResourceAccumulatorNumAccumulatedOp : public AccumulatorNumAccumulatedOp {
+ public:
+  explicit ResourceAccumulatorNumAccumulatedOp(OpKernelConstruction* context)
+      : AccumulatorNumAccumulatedOp(context) {}
+
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_RESOURCE};
+  }
+
+ private:
+  TF_DISALLOW_COPY_AND_ASSIGN(ResourceAccumulatorNumAccumulatedOp);
+};
+
+REGISTER_KERNEL_BUILDER(
+    Name("ResourceAccumulatorNumAccumulated").Device(DEVICE_CPU),
+    ResourceAccumulatorNumAccumulatedOp);
+
 }  // namespace tensorflow
diff --git a/tensorflow/core/kernels/conditional_accumulator_base_op.h b/tensorflow/core/kernels/conditional_accumulator_base_op.h
index ca24d690f81..ab54fc1d914 100644
--- a/tensorflow/core/kernels/conditional_accumulator_base_op.h
+++ b/tensorflow/core/kernels/conditional_accumulator_base_op.h
@@ -60,7 +60,7 @@ class ConditionalAccumulatorBaseOp : public OpKernel {
     if (!accumulator_handle_set_) {
       OP_REQUIRES_OK(ctx, SetAccumulatorHandle(ctx));
     }
-    ctx->set_output_ref(0, &mu_, accumulator_handle_.AccessTensor(ctx));
+    SetHandleToOutput(ctx);
   }
 
  protected:
@@ -73,6 +73,12 @@ class ConditionalAccumulatorBaseOp : public OpKernel {
     }
   }
 
+ protected:
+  virtual void SetHandleToOutput(OpKernelContext* ctx)
+      SHARED_LOCKS_REQUIRED(mu_) = 0;
+
+  virtual Status CheckSignature(OpKernelContext* ctx) = 0;
+
  protected:
   typedef std::function<Status(ConditionalAccumulatorBase**)> Creator;
 
@@ -84,6 +90,9 @@ class ConditionalAccumulatorBaseOp : public OpKernel {
   PartialTensorShape shape_;
   ContainerInfo cinfo_;
   string reduction_type_;
+  mutex mu_;
+  PersistentTensor accumulator_handle_ GUARDED_BY(mu_);
+  bool accumulator_handle_set_ GUARDED_BY(mu_);
 
  private:
   Status SetAccumulatorHandle(OpKernelContext* ctx)
@@ -91,8 +100,7 @@ class ConditionalAccumulatorBaseOp : public OpKernel {
     TF_RETURN_IF_ERROR(cinfo_.Init(ctx->resource_manager(), def()));
 
     // Check input signature
-    DataTypeVector expected_inputs = {};
-    TF_RETURN_IF_ERROR(ctx->MatchSignature(expected_inputs, {DT_STRING_REF}));
+    TF_RETURN_IF_ERROR(CheckSignature(ctx));
 
     Creator creator = GetCreator();
     ConditionalAccumulatorBase* accumulator;
@@ -112,11 +120,72 @@ class ConditionalAccumulatorBaseOp : public OpKernel {
     return Status::OK();
   }
 
-  mutex mu_;
-  PersistentTensor accumulator_handle_ GUARDED_BY(mu_);
-  bool accumulator_handle_set_ GUARDED_BY(mu_);
 };
 
+// ------------------Sync kernels ------------------------------------------
+
+/**
+ * General OpKernel for ConditionalAccumulatorBase-related ops.
+ */
+class ConditionalAccumulatorBaseSyncOpKernel : public OpKernel {
+ public:
+  explicit ConditionalAccumulatorBaseSyncOpKernel(OpKernelConstruction* context)
+      : OpKernel(context) {}
+
+  void Compute(OpKernelContext* ctx) final {
+    ConditionalAccumulatorBase* accumulator;
+    OP_REQUIRES_OK(ctx, GetResourceFromContext(ctx, "handle", &accumulator));
+    Compute(ctx, accumulator);
+    accumulator->Unref();
+  }
+
+ protected:
+  virtual void Compute(OpKernelContext* ctx,
+                       ConditionalAccumulatorBase* accumulator) = 0;
+
+  virtual DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) = 0;
+
+  virtual void CheckSignature(OpKernelContext* ctx,
+                              ConditionalAccumulatorBase* accumulator) {
+    // Check input signature
+    DataTypeVector expected_inputs = GetExpectedInputs(accumulator);
+    OP_REQUIRES_OK(ctx, ctx->MatchSignature(expected_inputs, {}));
+  }
+};
+
+/**
+ * Defines a AccumulateGradientOp, the execution of which adds a gradient to the
+ * given ConditionalAccumulator.
+ */
+class ConditionalAccumulatorBaseApplyGradientOp
+    : public ConditionalAccumulatorBaseSyncOpKernel {
+ public:
+  explicit ConditionalAccumulatorBaseApplyGradientOp(
+      OpKernelConstruction* context)
+      : ConditionalAccumulatorBaseSyncOpKernel(context) {}
+
+ protected:
+  void Compute(OpKernelContext* ctx,
+               ConditionalAccumulatorBase* accumulator) override {
+    // Check input signature
+    CheckSignature(ctx, accumulator);
+
+    // Get input local_step
+    const Tensor* local_step_tensor;
+    OP_REQUIRES_OK(ctx, ctx->input("local_step", &local_step_tensor));
+    if (!TensorShapeUtils::IsScalar(local_step_tensor->shape())) {
+      ctx->CtxFailureWithWarning(errors::InvalidArgument(
+          "Argument local_step must be scalar, but had bad shape ",
+          local_step_tensor->shape().DebugString()));
+    }
+
+    // Actually try to apply gradient now
+    accumulator->TryApplyGrad(local_step_tensor->scalar<int64>()(), ctx);
+  }
+};
+
+// -------------------- Async kernels --------------------------------------
 /**
  * General OpKernel for ConditionalAccumulatorBase-related ops.
  */
@@ -140,59 +209,18 @@ class ConditionalAccumulatorBaseAsyncOpKernel : public AsyncOpKernel {
   virtual void ComputeAsync(OpKernelContext* ctx,
                             ConditionalAccumulatorBase* accumulator,
                             DoneCallback callback) = 0;
-};
 
-/**
- * General OpKernel for ConditionalAccumulatorBase-related ops.
- */
-class ConditionalAccumulatorBaseSyncOpKernel : public OpKernel {
- public:
-  explicit ConditionalAccumulatorBaseSyncOpKernel(OpKernelConstruction* context)
-      : OpKernel(context) {}
+  virtual DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) = 0;
 
-  void Compute(OpKernelContext* ctx) final {
-    ConditionalAccumulatorBase* accumulator;
-    OP_REQUIRES_OK(ctx, GetResourceFromContext(ctx, "handle", &accumulator));
-    Compute(ctx, accumulator);
-    accumulator->Unref();
-  }
-
- protected:
-  virtual void Compute(OpKernelContext* ctx,
-                       ConditionalAccumulatorBase* accumulator) = 0;
-};
-
-/**
- * Defines a AccumulateGradientOp, the execution of which adds a gradient to the
- * given ConditionalAccumulator.
- */
-class ConditionalAccumulatorBaseApplyGradientOp
-    : public ConditionalAccumulatorBaseSyncOpKernel {
- public:
-  explicit ConditionalAccumulatorBaseApplyGradientOp(
-      OpKernelConstruction* context)
-      : ConditionalAccumulatorBaseSyncOpKernel(context) {}
-
- protected:
   virtual void CheckSignature(OpKernelContext* ctx,
-                              ConditionalAccumulatorBase* accumulator) = 0;
-
-  void Compute(OpKernelContext* ctx,
-               ConditionalAccumulatorBase* accumulator) override {
+                              ConditionalAccumulatorBase* accumulator,
+                              DoneCallback callback) {
     // Check input signature
-    CheckSignature(ctx, accumulator);
-
-    // Get input local_step
-    const Tensor* local_step_tensor;
-    OP_REQUIRES_OK(ctx, ctx->input("local_step", &local_step_tensor));
-    if (!TensorShapeUtils::IsScalar(local_step_tensor->shape())) {
-      ctx->CtxFailureWithWarning(errors::InvalidArgument(
-          "Argument local_step must be scalar, but had bad shape ",
-          local_step_tensor->shape().DebugString()));
-    }
-
-    // Actually try to apply gradient now
-    accumulator->TryApplyGrad(local_step_tensor->scalar<int64>()(), ctx);
+    OP_REQUIRES_OK_ASYNC(ctx,
+                         ctx->MatchSignature(GetExpectedInputs(accumulator),
+                                             {accumulator->dtype()}),
+                         callback);
   }
 };
 
@@ -208,10 +236,6 @@ class ConditionalAccumulatorBaseTakeGradientOp
       : ConditionalAccumulatorBaseAsyncOpKernel(context) {}
 
  protected:
-  virtual void CheckSignature(OpKernelContext* ctx,
-                              ConditionalAccumulatorBase* accumulator,
-                              DoneCallback callback) = 0;
-
   void ComputeAsync(OpKernelContext* ctx,
                     ConditionalAccumulatorBase* accumulator,
                     DoneCallback callback) override {
diff --git a/tensorflow/core/kernels/conditional_accumulator_op.cc b/tensorflow/core/kernels/conditional_accumulator_op.cc
index 52ac51a9b62..2bbd0ec35fb 100644
--- a/tensorflow/core/kernels/conditional_accumulator_op.cc
+++ b/tensorflow/core/kernels/conditional_accumulator_op.cc
@@ -41,6 +41,16 @@ class ConditionalAccumulatorOp : public ConditionalAccumulatorBaseOp {
     };
   }
 
+  Status CheckSignature(OpKernelContext* ctx) override {
+    TF_RETURN_IF_ERROR(ctx->MatchSignature({}, {DT_STRING_REF}));
+    return Status::OK();
+  }
+
+  void SetHandleToOutput(OpKernelContext* ctx)
+      SHARED_LOCKS_REQUIRED(mu_) override {
+    ctx->set_output_ref(0, &mu_, accumulator_handle_.AccessTensor(ctx));
+  }
+
   TF_DISALLOW_COPY_AND_ASSIGN(ConditionalAccumulatorOp);
 };
 
@@ -50,6 +60,50 @@ class ConditionalAccumulatorOp : public ConditionalAccumulatorBaseOp {
                               .TypeConstraint<type>("dtype"), \
                           ConditionalAccumulatorOp<dev##Device, type>)
 
+// Resource conditional accumulator
+template <typename Device, typename T>
+class ResourceConditionalAccumulatorOp : public ConditionalAccumulatorBaseOp {
+ public:
+  explicit ResourceConditionalAccumulatorOp(OpKernelConstruction* context)
+      : ConditionalAccumulatorBaseOp(context) {}
+
+ protected:
+  Creator GetCreator() const override {
+    return [this](ConditionalAccumulatorBase** ret) {
+      ConditionalAccumulator<Device, T>* accumulator =
+          new ConditionalAccumulator<Device, T>(dtype_, shape_, cinfo_.name(),
+                                                reduction_type_);
+      *ret = accumulator;
+      return Status::OK();
+    };
+  }
+
+  Status CheckSignature(OpKernelContext* ctx) override {
+    TF_RETURN_IF_ERROR(ctx->MatchSignature({}, {DT_RESOURCE}));
+    return Status::OK();
+  }
+
+  void SetHandleToOutput(OpKernelContext* ctx)
+      SHARED_LOCKS_REQUIRED(mu_) override {
+    auto h = accumulator_handle_.AccessTensor(ctx)->template flat<string>();
+    h(0) = cinfo_.container();
+    h(1) = cinfo_.name();
+    OP_REQUIRES_OK(ctx, MakeResourceHandleToOutput(
+                            ctx, 0, cinfo_.container(), cinfo_.name(),
+                            MakeTypeIndex<ConditionalAccumulatorBase>()));
+  }
+
+  TF_DISALLOW_COPY_AND_ASSIGN(ResourceConditionalAccumulatorOp);
+};
+
+#define REGISTER_RESOURCE_KERNELS(type, dev)                     \
+  REGISTER_KERNEL_BUILDER(Name("ResourceConditionalAccumulator") \
+                              .Device(DEVICE_##dev)              \
+                              .TypeConstraint<type>("dtype"),    \
+                          ResourceConditionalAccumulatorOp<dev##Device, type>)
+
+// End of Resource conditional accumulator
+
 #define REGISTER_KERNELS_CPU(type) REGISTER_KERNELS(type, CPU)
 
 TF_CALL_half(REGISTER_KERNELS_CPU);
@@ -59,6 +113,15 @@ TF_CALL_double(REGISTER_KERNELS_CPU);
 #undef REGISTER_KERNELS_CPU
 #undef REGISTER_KERNELS
 
+#define REGISTER_RESOURCE_KERNELS_CPU(type) REGISTER_RESOURCE_KERNELS(type, CPU)
+
+TF_CALL_half(REGISTER_RESOURCE_KERNELS_CPU);
+TF_CALL_float(REGISTER_RESOURCE_KERNELS_CPU);
+TF_CALL_double(REGISTER_RESOURCE_KERNELS_CPU);
+
+#undef REGISTER_KERNELS_CPU
+#undef REGISTER_KERNELS
+
 /**
  * Defines a AccumulateGradientOp, the execution of which adds a gradient to the
  * given ConditionalAccumulator.
@@ -69,13 +132,12 @@ class AccumulatorApplyGradientOp
   explicit AccumulatorApplyGradientOp(OpKernelConstruction* context)
       : ConditionalAccumulatorBaseApplyGradientOp(context) {}
 
- protected:
-  void CheckSignature(OpKernelContext* ctx,
-                      ConditionalAccumulatorBase* accumulator) override {
-    // Check input signature
-    DataTypeVector expected_inputs = {DT_STRING_REF, DT_INT64};
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    DataTypeVector expected_inputs;
+    expected_inputs = {DT_STRING_REF, DT_INT64};
     expected_inputs.push_back(accumulator->dtype());
-    OP_REQUIRES_OK(ctx, ctx->MatchSignature(expected_inputs, {}));
+    return expected_inputs;
   }
 
  private:
@@ -85,6 +147,28 @@ class AccumulatorApplyGradientOp
 REGISTER_KERNEL_BUILDER(Name("AccumulatorApplyGradient").Device(DEVICE_CPU),
                         AccumulatorApplyGradientOp);
 
+class ResourceAccumulatorApplyGradientOp
+    : public ConditionalAccumulatorBaseApplyGradientOp {
+ public:
+  explicit ResourceAccumulatorApplyGradientOp(OpKernelConstruction* context)
+      : ConditionalAccumulatorBaseApplyGradientOp(context) {}
+
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    DataTypeVector expected_inputs;
+    expected_inputs = {DT_RESOURCE, DT_INT64};
+    expected_inputs.push_back(accumulator->dtype());
+    return expected_inputs;
+  }
+
+ private:
+  TF_DISALLOW_COPY_AND_ASSIGN(ResourceAccumulatorApplyGradientOp);
+};
+
+REGISTER_KERNEL_BUILDER(
+    Name("ResourceAccumulatorApplyGradient").Device(DEVICE_CPU),
+    ResourceAccumulatorApplyGradientOp);
+
 /**
  * Defines a ConditionalAccumulatorBaseTakeGradientOp, the execution of which
  * returns the average gradient accumulated by the given ConditionalAccumulator.
@@ -95,22 +179,34 @@ class AccumulatorTakeGradientOp
   explicit AccumulatorTakeGradientOp(OpKernelConstruction* context)
       : ConditionalAccumulatorBaseTakeGradientOp(context) {}
 
- protected:
-  void CheckSignature(OpKernelContext* ctx,
-                      ConditionalAccumulatorBase* accumulator,
-                      DoneCallback callback) override {
-    // Check signature
-    OP_REQUIRES_OK_ASYNC(
-        ctx,
-        ctx->MatchSignature({DT_STRING_REF, DT_INT32}, {accumulator->dtype()}),
-        callback);
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_STRING_REF, DT_INT32};
   }
 
  private:
   TF_DISALLOW_COPY_AND_ASSIGN(AccumulatorTakeGradientOp);
 };
-
 REGISTER_KERNEL_BUILDER(Name("AccumulatorTakeGradient").Device(DEVICE_CPU),
                         AccumulatorTakeGradientOp);
 
+class ResourceAccumulatorTakeGradientOp
+    : public ConditionalAccumulatorBaseTakeGradientOp {
+ public:
+  explicit ResourceAccumulatorTakeGradientOp(OpKernelConstruction* context)
+      : ConditionalAccumulatorBaseTakeGradientOp(context) {}
+
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_RESOURCE, DT_INT32};
+  }
+
+ private:
+  TF_DISALLOW_COPY_AND_ASSIGN(ResourceAccumulatorTakeGradientOp);
+};
+
+REGISTER_KERNEL_BUILDER(
+    Name("ResourceAccumulatorTakeGradient").Device(DEVICE_CPU),
+    ResourceAccumulatorTakeGradientOp);
+
 }  // namespace tensorflow
diff --git a/tensorflow/core/kernels/sparse_conditional_accumulator_op.cc b/tensorflow/core/kernels/sparse_conditional_accumulator_op.cc
index 1e542a26a78..0d9980422a7 100644
--- a/tensorflow/core/kernels/sparse_conditional_accumulator_op.cc
+++ b/tensorflow/core/kernels/sparse_conditional_accumulator_op.cc
@@ -41,6 +41,18 @@ class SparseConditionalAccumulatorOp : public ConditionalAccumulatorBaseOp {
     };
   }
 
+  // TODO(tanzheny): actually switch it to resource. You won't be able to use
+  // it with cond2 otherwise.
+  Status CheckSignature(OpKernelContext* ctx) override {
+    TF_RETURN_IF_ERROR(ctx->MatchSignature({}, {DT_STRING_REF}));
+    return Status::OK();
+  }
+
+  void SetHandleToOutput(OpKernelContext* ctx)
+      SHARED_LOCKS_REQUIRED(mu_) override {
+    ctx->set_output_ref(0, &mu_, accumulator_handle_.AccessTensor(ctx));
+  }
+
   TF_DISALLOW_COPY_AND_ASSIGN(SparseConditionalAccumulatorOp);
 };
 
@@ -70,13 +82,12 @@ class SparseAccumulatorApplyGradientOp
       : ConditionalAccumulatorBaseApplyGradientOp(context) {}
 
  protected:
-  void CheckSignature(OpKernelContext* ctx,
-                      ConditionalAccumulatorBase* accumulator) override {
-    // Check input signature
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
     DataTypeVector expected_inputs = {DT_STRING_REF, DT_INT64, DT_INT64};
     expected_inputs.push_back(accumulator->dtype());
     expected_inputs.push_back(DT_INT64);
-    OP_REQUIRES_OK(ctx, ctx->MatchSignature(expected_inputs, {}));
+    return expected_inputs;
   }
 
  private:
@@ -109,6 +120,11 @@ class SparseAccumulatorTakeGradientOp
         callback);
   }
 
+  DataTypeVector GetExpectedInputs(
+      ConditionalAccumulatorBase* accumulator) override {
+    return {DT_STRING_REF, DT_INT32};
+  }
+
  private:
   TF_DISALLOW_COPY_AND_ASSIGN(SparseAccumulatorTakeGradientOp);
 };
diff --git a/tensorflow/core/ops/data_flow_ops.cc b/tensorflow/core/ops/data_flow_ops.cc
index ffab8ad6618..b9115a1ee00 100644
--- a/tensorflow/core/ops/data_flow_ops.cc
+++ b/tensorflow/core/ops/data_flow_ops.cc
@@ -451,6 +451,61 @@ REGISTER_OP("AccumulatorTakeGradient")
     })
     .Attr("dtype: numbertype");
 
+// -----------------V2 accumulators that use resource -------------------------
+
+REGISTER_OP("ResourceAccumulatorNumAccumulated")
+    .Input("handle: resource")
+    .Output("num_accumulated: int32")
+    .SetShapeFn(shape_inference::ScalarShape);
+
+REGISTER_OP("ResourceAccumulatorSetGlobalStep")
+    .Input("handle: resource")
+    .Input("new_global_step: int64")
+    .SetShapeFn([](InferenceContext* c) {
+      ShapeHandle unused;
+      TF_RETURN_IF_ERROR(c->WithRank(c->input(1), 0, &unused));
+      return Status::OK();
+    });
+
+REGISTER_OP("ResourceConditionalAccumulator")
+    .Output("handle: resource")
+    .Attr("dtype: numbertype")
+    .Attr("shape: shape")
+    .Attr("container: string = ''")
+    .Attr("shared_name: string = ''")
+    .Attr("reduction_type: { 'MEAN', 'SUM' } = 'MEAN' ")
+    .SetIsStateful()
+    .SetShapeFn([](InferenceContext* c) {
+      c->set_output(0, c->Vector(2));
+      return Status::OK();
+    });
+
+REGISTER_OP("ResourceAccumulatorApplyGradient")
+    .Input("handle: resource")
+    .Input("local_step: int64")
+    .Input("gradient: dtype")
+    .Attr("dtype: numbertype")
+    .SetShapeFn([](InferenceContext* c) {
+      ShapeHandle unused;
+      TF_RETURN_IF_ERROR(c->WithRank(c->input(1), 0, &unused));
+      return Status::OK();
+    });
+
+REGISTER_OP("ResourceAccumulatorTakeGradient")
+    .Input("handle: resource")
+    .Input("num_required: int32")
+    .Output("average: dtype")
+    .SetShapeFn([](InferenceContext* c) {
+      ShapeHandle unused;
+      TF_RETURN_IF_ERROR(c->WithRank(c->input(1), 0, &unused));
+      // Shape of output is the shape of the accumulator referenced
+      // by 'handle', but which is not available here, so we lose
+      // shape information.
+      return shape_inference::UnknownShape(c);
+    })
+    .Attr("dtype: numbertype");
+
+// TODO(nponomareva): change these all to use resources.
 REGISTER_OP("SparseConditionalAccumulator")
     .Output("handle: Ref(string)")
     .Attr("dtype: numbertype")
diff --git a/tensorflow/python/ops/data_flow_ops.py b/tensorflow/python/ops/data_flow_ops.py
index eac7edab0eb..648453f3569 100644
--- a/tensorflow/python/ops/data_flow_ops.py
+++ b/tensorflow/python/ops/data_flow_ops.py
@@ -24,6 +24,7 @@ import threading
 
 import six
 
+from tensorflow.python.compat import compat
 from tensorflow.python.eager import context
 from tensorflow.python.framework import dtypes as _dtypes
 from tensorflow.python.framework import ops
@@ -1215,6 +1216,11 @@ class ConditionalAccumulatorBase(object):
     """
     if name is None:
       name = "%s_NumAccumulated" % self._name
+
+    if compat.forward_compatible(2019, 7, 8):
+      return gen_data_flow_ops.resource_accumulator_num_accumulated(
+          self._accumulator_ref, name=name)
+
     return gen_data_flow_ops.accumulator_num_accumulated(
         self._accumulator_ref, name=name)
 
@@ -1231,6 +1237,12 @@ class ConditionalAccumulatorBase(object):
     Returns:
       Operation that sets the accumulator's time step.
     """
+    if compat.forward_compatible(2019, 7, 8):
+      return gen_data_flow_ops.resource_accumulator_set_global_step(
+          self._accumulator_ref,
+          math_ops.cast(ops.convert_to_tensor(new_global_step), _dtypes.int64),
+          name=name)
+
     return gen_data_flow_ops.accumulator_set_global_step(
         self._accumulator_ref,
         math_ops.cast(ops.convert_to_tensor(new_global_step), _dtypes.int64),
@@ -1264,12 +1276,23 @@ class ConditionalAccumulator(ConditionalAccumulatorBase):
       name: Optional name for the accumulator.
       reduction_type: Reduction type to use when taking the gradient.
     """
-    accumulator_ref = gen_data_flow_ops.conditional_accumulator(
-        dtype=dtype,
-        shape=shape,
-        shared_name=shared_name,
-        name=name,
-        reduction_type=reduction_type)
+    if compat.forward_compatible(2019, 7, 8):
+      accumulator_ref = gen_data_flow_ops.resource_conditional_accumulator(
+          dtype=dtype,
+          shape=shape,
+          shared_name=shared_name,
+          name=name,
+          reduction_type=reduction_type)
+      self._resource_deleter = resource_variable_ops.EagerResourceDeleter(
+          handle=accumulator_ref, handle_device=context.context().device_name)
+    else:
+      accumulator_ref = gen_data_flow_ops.conditional_accumulator(
+          dtype=dtype,
+          shape=shape,
+          shared_name=shared_name,
+          name=name,
+          reduction_type=reduction_type)
+
     super(ConditionalAccumulator, self).__init__(dtype, shape, accumulator_ref)
 
   def apply_grad(self, grad, local_step=0, name=None):
@@ -1292,6 +1315,13 @@ class ConditionalAccumulator(ConditionalAccumulatorBase):
     grad = ops.convert_to_tensor(grad, self._dtype)
     grad.get_shape().assert_is_compatible_with(self._shape)
     local_step = math_ops.cast(ops.convert_to_tensor(local_step), _dtypes.int64)
+
+    if compat.forward_compatible(2019, 7, 8):
+      return gen_data_flow_ops.resource_accumulator_apply_gradient(
+          self._accumulator_ref,
+          local_step=local_step,
+          gradient=grad,
+          name=name)
     return gen_data_flow_ops.accumulator_apply_gradient(
         self._accumulator_ref, local_step=local_step, gradient=grad, name=name)
 
@@ -1317,8 +1347,12 @@ class ConditionalAccumulator(ConditionalAccumulatorBase):
     Raises:
       InvalidArgumentError: If num_required < 1
     """
-    out = gen_data_flow_ops.accumulator_take_gradient(
-        self._accumulator_ref, num_required, dtype=self._dtype, name=name)
+    if compat.forward_compatible(2019, 7, 8):
+      out = gen_data_flow_ops.resource_accumulator_take_gradient(
+          self._accumulator_ref, num_required, dtype=self._dtype, name=name)
+    else:
+      out = gen_data_flow_ops.accumulator_take_gradient(
+          self._accumulator_ref, num_required, dtype=self._dtype, name=name)
     out.set_shape(self._shape)
     return out
 
diff --git a/tensorflow/tools/api/golden/v1/tensorflow.raw_ops.pbtxt b/tensorflow/tools/api/golden/v1/tensorflow.raw_ops.pbtxt
index f0609b0e425..16725f81b8c 100644
--- a/tensorflow/tools/api/golden/v1/tensorflow.raw_ops.pbtxt
+++ b/tensorflow/tools/api/golden/v1/tensorflow.raw_ops.pbtxt
@@ -3016,6 +3016,22 @@ tf_module {
     name: "ResizeNearestNeighborGrad"
     argspec: "args=[\'grads\', \'size\', \'align_corners\', \'half_pixel_centers\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'False\', \'None\'], "
   }
+  member_method {
+    name: "ResourceAccumulatorApplyGradient"
+    argspec: "args=[\'handle\', \'local_step\', \'gradient\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorNumAccumulated"
+    argspec: "args=[\'handle\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorSetGlobalStep"
+    argspec: "args=[\'handle\', \'new_global_step\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorTakeGradient"
+    argspec: "args=[\'handle\', \'num_required\', \'dtype\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
   member_method {
     name: "ResourceApplyAdaMax"
     argspec: "args=[\'var\', \'m\', \'v\', \'beta1_power\', \'lr\', \'beta1\', \'beta2\', \'epsilon\', \'grad\', \'use_locking\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'None\'], "
@@ -3084,6 +3100,10 @@ tf_module {
     name: "ResourceApplyRMSProp"
     argspec: "args=[\'var\', \'ms\', \'mom\', \'lr\', \'rho\', \'momentum\', \'epsilon\', \'grad\', \'use_locking\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'None\'], "
   }
+  member_method {
+    name: "ResourceConditionalAccumulator"
+    argspec: "args=[\'dtype\', \'shape\', \'container\', \'shared_name\', \'reduction_type\', \'name\'], varargs=None, keywords=None, defaults=[\'\', \'\', \'MEAN\', \'None\'], "
+  }
   member_method {
     name: "ResourceCountUpTo"
     argspec: "args=[\'resource\', \'limit\', \'T\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
diff --git a/tensorflow/tools/api/golden/v2/tensorflow.raw_ops.pbtxt b/tensorflow/tools/api/golden/v2/tensorflow.raw_ops.pbtxt
index f0609b0e425..16725f81b8c 100644
--- a/tensorflow/tools/api/golden/v2/tensorflow.raw_ops.pbtxt
+++ b/tensorflow/tools/api/golden/v2/tensorflow.raw_ops.pbtxt
@@ -3016,6 +3016,22 @@ tf_module {
     name: "ResizeNearestNeighborGrad"
     argspec: "args=[\'grads\', \'size\', \'align_corners\', \'half_pixel_centers\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'False\', \'None\'], "
   }
+  member_method {
+    name: "ResourceAccumulatorApplyGradient"
+    argspec: "args=[\'handle\', \'local_step\', \'gradient\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorNumAccumulated"
+    argspec: "args=[\'handle\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorSetGlobalStep"
+    argspec: "args=[\'handle\', \'new_global_step\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
+  member_method {
+    name: "ResourceAccumulatorTakeGradient"
+    argspec: "args=[\'handle\', \'num_required\', \'dtype\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "
+  }
   member_method {
     name: "ResourceApplyAdaMax"
     argspec: "args=[\'var\', \'m\', \'v\', \'beta1_power\', \'lr\', \'beta1\', \'beta2\', \'epsilon\', \'grad\', \'use_locking\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'None\'], "
@@ -3084,6 +3100,10 @@ tf_module {
     name: "ResourceApplyRMSProp"
     argspec: "args=[\'var\', \'ms\', \'mom\', \'lr\', \'rho\', \'momentum\', \'epsilon\', \'grad\', \'use_locking\', \'name\'], varargs=None, keywords=None, defaults=[\'False\', \'None\'], "
   }
+  member_method {
+    name: "ResourceConditionalAccumulator"
+    argspec: "args=[\'dtype\', \'shape\', \'container\', \'shared_name\', \'reduction_type\', \'name\'], varargs=None, keywords=None, defaults=[\'\', \'\', \'MEAN\', \'None\'], "
+  }
   member_method {
     name: "ResourceCountUpTo"
     argspec: "args=[\'resource\', \'limit\', \'T\', \'name\'], varargs=None, keywords=None, defaults=[\'None\'], "