hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/RegionsResource.java

   1 /*
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 package org.apache.hadoop.hbase.rest;
  21
  22 import java.io.IOException;
  23 import java.util.List;
  24 import javax.ws.rs.GET;
  25 import javax.ws.rs.Produces;
  26 import javax.ws.rs.core.CacheControl;
  27 import javax.ws.rs.core.Context;
  28 import javax.ws.rs.core.Response;
  29 import javax.ws.rs.core.Response.ResponseBuilder;
  30 import javax.ws.rs.core.UriInfo;
  31 import org.apache.hadoop.hbase.HRegionLocation;
  32 import org.apache.hadoop.hbase.ServerName;
  33 import org.apache.hadoop.hbase.TableName;
  34 import org.apache.hadoop.hbase.TableNotFoundException;
  35 import org.apache.hadoop.hbase.client.Connection;
  36 import org.apache.hadoop.hbase.client.ConnectionFactory;
  37 import org.apache.hadoop.hbase.client.RegionInfo;
  38 import org.apache.hadoop.hbase.client.RegionLocator;
  39 import org.apache.hadoop.hbase.rest.model.TableInfoModel;
  40 import org.apache.hadoop.hbase.rest.model.TableRegionModel;
  41 import org.apache.yetus.audience.InterfaceAudience;
  42 import org.slf4j.Logger;
  43 import org.slf4j.LoggerFactory;
  44
  45 @InterfaceAudience.Private
  46 public class RegionsResource extends ResourceBase {
  47   private static final Logger LOG = LoggerFactory.getLogger(RegionsResource.class);
  48
  49   static CacheControl cacheControl;
  50   static {
  51     cacheControl = new CacheControl();
  52     cacheControl.setNoCache(true);
  53     cacheControl.setNoTransform(false);
  54   }
  55
  56   TableResource tableResource;
  57
  58   /**
  59    * Constructor
  60    * @param tableResource
  61    * @throws IOException
  62    */
  63   public RegionsResource(TableResource tableResource) throws IOException {
  64     super();
  65     this.tableResource = tableResource;
  66   }
  67
  68   @GET
  69   @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
  70     MIMETYPE_PROTOBUF_IETF})
  71   public Response get(final @Context UriInfo uriInfo) {
  72     if (LOG.isTraceEnabled()) {
  73       LOG.trace("GET " + uriInfo.getAbsolutePath());
  74     }
  75     servlet.getMetrics().incrementRequests(1);
  76     try {
  77       TableName tableName = TableName.valueOf(tableResource.getName());
  78       if (!tableResource.exists()) {
  79         throw new TableNotFoundException(tableName);
  80       }
  81       TableInfoModel model = new TableInfoModel(tableName.getNameAsString());
  82
  83       List<HRegionLocation> locs;
  84       try (Connection connection = ConnectionFactory.createConnection(servlet.getConfiguration());
  85         RegionLocator locator = connection.getRegionLocator(tableName)) {
  86         locs = locator.getAllRegionLocations();
  87       }
  88       for (HRegionLocation loc : locs) {
  89         RegionInfo hri = loc.getRegion();
  90         ServerName addr = loc.getServerName();
  91         model.add(new TableRegionModel(tableName.getNameAsString(), hri.getRegionId(),
  92           hri.getStartKey(), hri.getEndKey(), addr.getAddress().toString()));
  93       }
  94       ResponseBuilder response = Response.ok(model);
  95       response.cacheControl(cacheControl);
  96       servlet.getMetrics().incrementSucessfulGetRequests(1);
  97       return response.build();
  98     } catch (TableNotFoundException e) {
  99       servlet.getMetrics().incrementFailedGetRequests(1);
 100       return Response.status(Response.Status.NOT_FOUND)
 101         .type(MIMETYPE_TEXT).entity("Not found" + CRLF)
 102         .build();
 103     } catch (IOException e) {
 104       servlet.getMetrics().incrementFailedGetRequests(1);
 105       return Response.status(Response.Status.SERVICE_UNAVAILABLE)
 106         .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
 107         .build();
 108     }
 109   }
 110 }