001/* 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, software 014 * distributed under the License is distributed on an "AS IS" BASIS, 015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 016 * See the License for the specific language governing permissions and 017 * limitations under the License. 018 */ 019 020package org.apache.hadoop.hbase.rest; 021 022import java.io.IOException; 023import java.util.List; 024import javax.ws.rs.GET; 025import javax.ws.rs.Produces; 026import javax.ws.rs.core.CacheControl; 027import javax.ws.rs.core.Context; 028import javax.ws.rs.core.Response; 029import javax.ws.rs.core.Response.ResponseBuilder; 030import javax.ws.rs.core.UriInfo; 031import org.apache.hadoop.hbase.HRegionLocation; 032import org.apache.hadoop.hbase.ServerName; 033import org.apache.hadoop.hbase.TableName; 034import org.apache.hadoop.hbase.TableNotFoundException; 035import org.apache.hadoop.hbase.client.Connection; 036import org.apache.hadoop.hbase.client.ConnectionFactory; 037import org.apache.hadoop.hbase.client.RegionInfo; 038import org.apache.hadoop.hbase.client.RegionLocator; 039import org.apache.hadoop.hbase.rest.model.TableInfoModel; 040import org.apache.hadoop.hbase.rest.model.TableRegionModel; 041import org.apache.yetus.audience.InterfaceAudience; 042import org.slf4j.Logger; 043import org.slf4j.LoggerFactory; 044 045@InterfaceAudience.Private 046public class RegionsResource extends ResourceBase { 047 private static final Logger LOG = LoggerFactory.getLogger(RegionsResource.class); 048 049 static CacheControl cacheControl; 050 static { 051 cacheControl = new CacheControl(); 052 cacheControl.setNoCache(true); 053 cacheControl.setNoTransform(false); 054 } 055 056 TableResource tableResource; 057 058 /** 059 * Constructor 060 * @param tableResource 061 * @throws IOException 062 */ 063 public RegionsResource(TableResource tableResource) throws IOException { 064 super(); 065 this.tableResource = tableResource; 066 } 067 068 @GET 069 @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF, 070 MIMETYPE_PROTOBUF_IETF}) 071 public Response get(final @Context UriInfo uriInfo) { 072 if (LOG.isTraceEnabled()) { 073 LOG.trace("GET " + uriInfo.getAbsolutePath()); 074 } 075 servlet.getMetrics().incrementRequests(1); 076 try { 077 TableName tableName = TableName.valueOf(tableResource.getName()); 078 if (!tableResource.exists()) { 079 throw new TableNotFoundException(tableName); 080 } 081 TableInfoModel model = new TableInfoModel(tableName.getNameAsString()); 082 083 List<HRegionLocation> locs; 084 try (Connection connection = ConnectionFactory.createConnection(servlet.getConfiguration()); 085 RegionLocator locator = connection.getRegionLocator(tableName)) { 086 locs = locator.getAllRegionLocations(); 087 } 088 for (HRegionLocation loc : locs) { 089 RegionInfo hri = loc.getRegion(); 090 ServerName addr = loc.getServerName(); 091 model.add(new TableRegionModel(tableName.getNameAsString(), hri.getRegionId(), 092 hri.getStartKey(), hri.getEndKey(), addr.getAddress().toString())); 093 } 094 ResponseBuilder response = Response.ok(model); 095 response.cacheControl(cacheControl); 096 servlet.getMetrics().incrementSucessfulGetRequests(1); 097 return response.build(); 098 } catch (TableNotFoundException e) { 099 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}