remove interface key in contextFilter

Author: carryxyh

dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/support/AbstractClusterInvoker.java

@@ -234,12 +234,6 @@ public Result invoke(final Invocation invocation) throws RpcException {
         Map<String, String> contextAttachments = RpcContext.getContext().getAttachments();
         if (contextAttachments != null && contextAttachments.size() != 0) {
             ((RpcInvocation) invocation).addAttachments(contextAttachments);
-            // We need to remove the interface because the interface here may come from last invoke.
-            //
-            // See https://github.com/apache/incubator-dubbo/issues/2981
-            if (invocation.getAttachments() != null) {
-                invocation.getAttachments().remove(Constants.INTERFACE_KEY);
-            }
         }
 
         List<Invoker<T>> invokers = list(invocation);

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/ContextFilter.java

@@ -42,8 +42,9 @@ public class ContextFilter implements Filter {
     public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
         Map<String, String> attachments = invocation.getAttachments();
         if (attachments != null) {
-            attachments = new HashMap<String, String>(attachments);
+            attachments = new HashMap<>(attachments);
             attachments.remove(Constants.PATH_KEY);
+            attachments.remove(Constants.INTERFACE_KEY);
             attachments.remove(Constants.GROUP_KEY);
             attachments.remove(Constants.VERSION_KEY);
             attachments.remove(Constants.DUBBO_VERSION_KEY);

dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/protocol/AbstractInvoker.java

@@ -134,7 +134,9 @@ public Result invoke(Invocation inv) throws RpcException {
         }
         RpcInvocation invocation = (RpcInvocation) inv;
         invocation.setInvoker(this);
-
+        if (attachment != null && attachment.size() > 0) {
+            invocation.addAttachmentsIfAbsent(attachment);
+        }
         Map<String, String> contextAttachments = RpcContext.getContext().getAttachments();
         if (contextAttachments != null && contextAttachments.size() != 0) {
             /**
@@ -150,15 +152,6 @@ public Result invoke(Invocation inv) throws RpcException {
         }
         RpcUtils.attachInvocationIdIfAsync(getUrl(), invocation);
 
-        // If we have attachment, override the attachment to ensure that the last invoke's attach does not affect this call.
-        // In most cases, attachments contains interface, timeout, group, and token.
-        // These info should be override in each invoke.
-        //
-        // See https://github.com/apache/incubator-dubbo/issues/2981
-        if (attachment != null && attachment.size() > 0) {
-            invocation.addAttachments(attachment);
-        }
-
         try {
             return doInvoke(invocation);
         } catch (InvocationTargetException e) { // biz exception