[ 
https://issues.apache.org/jira/browse/MAPREDUCE-7530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18057919#comment-18057919
 ] 

ASF GitHub Bot commented on MAPREDUCE-7530:
-------------------------------------------

Hean-Chhinling commented on code in PR #8247:
URL: https://github.com/apache/hadoop/pull/8247#discussion_r2794292740


##########
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/webapp/jsonprovider/ExcludeRootJSONProvider.java:
##########
@@ -0,0 +1,83 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.mapreduce.v2.app.webapp.jsonprovider;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Type;
+import javax.inject.Inject;
+import javax.ws.rs.Consumes;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.ext.Provider;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
+
+import org.eclipse.persistence.jaxb.MarshallerProperties;
+import org.eclipse.persistence.jaxb.rs.MOXyJsonProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Provider
+@Produces(MediaType.APPLICATION_JSON)
+@Consumes(MediaType.APPLICATION_JSON)
+public class ExcludeRootJSONProvider extends MOXyJsonProvider {
+
+    private final static Logger LOG = 
LoggerFactory.getLogger(ExcludeRootJSONProvider.class);
+    private final ClassSerialisationConfig classSerialisationConfig;
+
+    @Inject
+    public ExcludeRootJSONProvider() {
+        classSerialisationConfig = new ClassSerialisationConfig();
+    }
+
+    @Override
+    public boolean isReadable(Class<?> type, Type genericType,
+            Annotation[] annotations, MediaType mediaType) {
+        boolean match = 
classSerialisationConfig.getUnWrappedClasses().contains(type);
+        LOG.trace("ExcludeRootJSONProvider compatibility with {} is {}", type, 
match);
+        return match;
+    }
+
+    @Override
+    public boolean isWriteable(Class<?> type, Type genericType,
+            Annotation[] annotations, MediaType mediaType) {
+        return isReadable(type, genericType, annotations, mediaType);
+    }
+
+    @Override
+    protected void preReadFrom(Class<Object> type, Type genericType,
+            Annotation[] annotations, MediaType mediaType,
+            MultivaluedMap<String, String> httpHeaders,
+            Unmarshaller unmarshaller) throws JAXBException {
+        LOG.trace("ExcludeRootJSONProvider preReadFrom with {}", type);

Review Comment:
   Will we need these log for production as well?
   Or you have not deleted it from your testing?





> MR AM REST API backward compatibility with Jersey1
> --------------------------------------------------
>
>                 Key: MAPREDUCE-7530
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7530
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am
>    Affects Versions: 3.5.0
>            Reporter: Bence Kosztolnik
>            Priority: Major
>              Labels: pull-request-available
>
> We can not get metrics for running MR job via proxy.
> Example call:
> http://\{{RM}}:8088/proxy/application_1770709887971_0014/ws/v1/mapreduce/jobs/job_1770709887971_0014/counters
> Results 404
> Seems like we have to use moxy here also



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