HDFS-11233. Fix javac warnings related to the deprecated APIs after upgrading Jackson. Contributed by Yiqun Lin.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/datanode/DiskBalancerWorkItem.java

@@ -37,7 +37,7 @@ import java.io.IOException;
 public class DiskBalancerWorkItem {
   private static final ObjectMapper MAPPER = new ObjectMapper();
   private static final ObjectReader READER =
-      new ObjectMapper().reader(DiskBalancerWorkItem.class);
+      new ObjectMapper().readerFor(DiskBalancerWorkItem.class);
 
   private  long startTime;
   private long secondsElapsed;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/datanode/DiskBalancerWorkStatus.java

@@ -43,9 +43,9 @@ public class DiskBalancerWorkStatus {
   private static final ObjectMapper MAPPER_WITH_INDENT_OUTPUT =
       new ObjectMapper().enable(SerializationFeature.INDENT_OUTPUT);
   private static final ObjectReader READER_WORKSTATUS =
-      new ObjectMapper().reader(DiskBalancerWorkStatus.class);
+      new ObjectMapper().readerFor(DiskBalancerWorkStatus.class);
   private static final ObjectReader READER_WORKENTRY = new ObjectMapper()
-      .reader(defaultInstance().constructCollectionType(List.class,
+      .readerFor(defaultInstance().constructCollectionType(List.class,
           DiskBalancerWorkEntry.class));
 
   private final List<DiskBalancerWorkEntry> currentState;

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/util/CombinedHostsFileReader.java

@@ -48,7 +48,7 @@ import org.apache.hadoop.hdfs.protocol.DatanodeAdminProperties;
 @InterfaceStability.Unstable
 public final class CombinedHostsFileReader {
   private static final ObjectReader READER =
-      new ObjectMapper().reader(DatanodeAdminProperties.class);
+      new ObjectMapper().readerFor(DatanodeAdminProperties.class);
   private static final JsonFactory JSON_FACTORY = new JsonFactory();
 
   private CombinedHostsFileReader() {

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/JsonUtilClient.java

@@ -526,7 +526,7 @@ class JsonUtilClient {
     }
 
     final String namesInJson = (String) json.get("XAttrNames");
-    ObjectReader reader = new ObjectMapper().reader(List.class);
+    ObjectReader reader = new ObjectMapper().readerFor(List.class);
     final List<Object> xattrs = reader.readValue(namesInJson);
     final List<String> names =
         Lists.newArrayListWithCapacity(json.keySet().size());

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/WebHdfsFileSystem.java

@@ -152,7 +152,7 @@ public class WebHdfsFileSystem extends FileSystem
   private String restCsrfCustomHeader;
   private Set<String> restCsrfMethodsToIgnore;
   private static final ObjectReader READER =
-      new ObjectMapper().reader(Map.class);
+      new ObjectMapper().readerFor(Map.class);
 
   private DFSOpsCountStatistics storageStatistics;
 

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/ConfRefreshTokenBasedAccessTokenProvider.java

@@ -56,7 +56,7 @@ import static org.apache.hadoop.hdfs.web.oauth2.Utils.notNull;
 public class ConfRefreshTokenBasedAccessTokenProvider
     extends AccessTokenProvider {
   private static final ObjectReader READER =
-      new ObjectMapper().reader(Map.class);
+      new ObjectMapper().readerFor(Map.class);
 
   public static final String OAUTH_REFRESH_TOKEN_KEY
       = "dfs.webhdfs.oauth2.refresh.token";

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/CredentialBasedAccessTokenProvider.java

@@ -56,7 +56,7 @@ import static org.apache.hadoop.hdfs.web.oauth2.Utils.notNull;
 public abstract class CredentialBasedAccessTokenProvider
     extends AccessTokenProvider {
   private static final ObjectReader READER =
-      new ObjectMapper().reader(Map.class);
+      new ObjectMapper().readerFor(Map.class);
 
   public static final String OAUTH_CREDENTIAL_KEY
       = "dfs.webhdfs.oauth2.credential";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java

@@ -106,7 +106,7 @@ public class FsVolumeImpl implements FsVolumeSpi {
   private static final ObjectWriter WRITER =
       new ObjectMapper().writerWithDefaultPrettyPrinter();
   private static final ObjectReader READER =
-      new ObjectMapper().reader(BlockIteratorState.class);
+      new ObjectMapper().readerFor(BlockIteratorState.class);
 
   private final FsDatasetImpl dataset;
   private final String storageID;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/command/Command.java

@@ -77,7 +77,7 @@ import java.util.TreeSet;
  */
 public abstract class Command extends Configured implements Closeable {
   private static final ObjectReader READER =
-      new ObjectMapper().reader(HashMap.class);
+      new ObjectMapper().readerFor(HashMap.class);
   static final Logger LOG = LoggerFactory.getLogger(Command.class);
   private Map<String, String> validArgs = new HashMap<>();
   private URI clusterURI;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/connectors/JsonNodeConnector.java

@@ -38,7 +38,7 @@ public class JsonNodeConnector implements ClusterConnector {
   private static final Logger LOG =
       LoggerFactory.getLogger(JsonNodeConnector.class);
   private static final ObjectReader READER =
-      new ObjectMapper().reader(DiskBalancerCluster.class);
+      new ObjectMapper().readerFor(DiskBalancerCluster.class);
   private final URL clusterURI;
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerCluster.java

@@ -73,7 +73,7 @@ public class DiskBalancerCluster {
   private static final Logger LOG =
       LoggerFactory.getLogger(DiskBalancerCluster.class);
   private static final ObjectReader READER =
-      new ObjectMapper().reader(DiskBalancerCluster.class);
+      new ObjectMapper().readerFor(DiskBalancerCluster.class);
   private final Set<String> exclusionList;
   private final Set<String> inclusionList;
   private ClusterConnector clusterConnector;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.java

@@ -33,7 +33,7 @@ import java.io.IOException;
 @JsonIgnoreProperties(ignoreUnknown = true)
 public class DiskBalancerVolume {
   private static final ObjectReader READER =
-      new ObjectMapper().reader(DiskBalancerVolume.class);
+      new ObjectMapper().readerFor(DiskBalancerVolume.class);
 
   private String path;
   private long capacity;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/planner/NodePlan.java

@@ -166,7 +166,7 @@ public class NodePlan {
   public String toJson() throws IOException {
     ObjectMapper mapper = new ObjectMapper();
     JavaType planType = mapper.constructType(NodePlan.class);
-    return mapper.writerWithType(planType)
+    return mapper.writerFor(planType)
         .writeValueAsString(this);
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestJsonUtil.java

@@ -71,7 +71,7 @@ public class TestJsonUtil {
     System.out.println("fstatus = " + fstatus);
     final String json = JsonUtil.toJsonString(status, true);
     System.out.println("json    = " + json.replace(",", ",\n  "));
-    ObjectReader reader = new ObjectMapper().reader(Map.class);
+    ObjectReader reader = new ObjectMapper().readerFor(Map.class);
     final HdfsFileStatus s2 =
         JsonUtilClient.toFileStatus((Map<?, ?>) reader.readValue(json), true);
     final FileStatus fs2 = toFileStatus(s2, parent);
@@ -159,7 +159,7 @@ public class TestJsonUtil {
   public void testToAclStatus() throws IOException {
     String jsonString =
         "{\"AclStatus\":{\"entries\":[\"user::rwx\",\"user:user1:rw-\",\"group::rw-\",\"other::r-x\"],\"group\":\"supergroup\",\"owner\":\"testuser\",\"stickyBit\":false}}";
-    ObjectReader reader = new ObjectMapper().reader(Map.class);
+    ObjectReader reader = new ObjectMapper().readerFor(Map.class);
     Map<?, ?> json = reader.readValue(jsonString);
 
     List<AclEntry> aclSpec =
@@ -219,7 +219,7 @@ public class TestJsonUtil {
     String jsonString = 
         "{\"XAttrs\":[{\"name\":\"user.a1\",\"value\":\"0x313233\"}," +
         "{\"name\":\"user.a2\",\"value\":\"0x313131\"}]}";
-    ObjectReader reader = new ObjectMapper().reader(Map.class);
+    ObjectReader reader = new ObjectMapper().readerFor(Map.class);
     Map<?, ?> json = reader.readValue(jsonString);
     XAttr xAttr1 = (new XAttr.Builder()).setNameSpace(XAttr.NameSpace.USER).
         setName("a1").setValue(XAttrCodec.decodeValue("0x313233")).build();
@@ -245,7 +245,7 @@ public class TestJsonUtil {
     String jsonString = 
         "{\"XAttrs\":[{\"name\":\"user.a1\",\"value\":\"0x313233\"}," +
         "{\"name\":\"user.a2\",\"value\":\"0x313131\"}]}";
-    ObjectReader reader = new ObjectMapper().reader(Map.class);
+    ObjectReader reader = new ObjectMapper().readerFor(Map.class);
     Map<?, ?> json = reader.readValue(jsonString);
 
     // Get xattr: user.a2