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20 package org.apache.hadoop.hbase.rest;
21
22 import java.io.IOException;
23 import java.util.Map;
24
25 import javax.ws.rs.GET;
26 import javax.ws.rs.Produces;
27 import javax.ws.rs.core.CacheControl;
28 import javax.ws.rs.core.Context;
29 import javax.ws.rs.core.Response;
30 import javax.ws.rs.core.UriInfo;
31 import javax.ws.rs.core.Response.ResponseBuilder;
32
33 import org.apache.commons.logging.Log;
34 import org.apache.commons.logging.LogFactory;
35
36 import org.apache.hadoop.hbase.classification.InterfaceAudience;
37 import org.apache.hadoop.hbase.TableName;
38 import org.apache.hadoop.hbase.HRegionInfo;
39 import org.apache.hadoop.hbase.ServerName;
40 import org.apache.hadoop.hbase.TableNotFoundException;
41 import org.apache.hadoop.hbase.client.Connection;
42 import org.apache.hadoop.hbase.client.ConnectionFactory;
43 import org.apache.hadoop.hbase.client.MetaScanner;
44 import org.apache.hadoop.hbase.rest.model.TableInfoModel;
45 import org.apache.hadoop.hbase.rest.model.TableRegionModel;
46
47 @InterfaceAudience.Private
48 public class RegionsResource extends ResourceBase {
49 private static final Log LOG = LogFactory.getLog(RegionsResource.class);
50
51 static CacheControl cacheControl;
52 static {
53 cacheControl = new CacheControl();
54 cacheControl.setNoCache(true);
55 cacheControl.setNoTransform(false);
56 }
57
58 TableResource tableResource;
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64
65 public RegionsResource(TableResource tableResource) throws IOException {
66 super();
67 this.tableResource = tableResource;
68 }
69
70 @GET
71 @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
72 MIMETYPE_PROTOBUF_IETF})
73 public Response get(final @Context UriInfo uriInfo) {
74 if (LOG.isTraceEnabled()) {
75 LOG.trace("GET " + uriInfo.getAbsolutePath());
76 }
77 servlet.getMetrics().incrementRequests(1);
78 try {
79 TableName tableName = TableName.valueOf(tableResource.getName());
80 TableInfoModel model = new TableInfoModel(tableName.getNameAsString());
81
82 Connection connection = ConnectionFactory.createConnection(servlet.getConfiguration());
83 Map<HRegionInfo, ServerName> regions = MetaScanner.allTableRegions(connection, tableName);
84 connection.close();
85 for (Map.Entry<HRegionInfo,ServerName> e: regions.entrySet()) {
86 HRegionInfo hri = e.getKey();
87 ServerName addr = e.getValue();
88 model.add(
89 new TableRegionModel(tableName.getNameAsString(), hri.getRegionId(),
90 hri.getStartKey(), hri.getEndKey(), addr.getHostAndPort()));
91 }
92 ResponseBuilder response = Response.ok(model);
93 response.cacheControl(cacheControl);
94 servlet.getMetrics().incrementSucessfulGetRequests(1);
95 return response.build();
96 } catch (TableNotFoundException e) {
97 servlet.getMetrics().incrementFailedGetRequests(1);
98 return Response.status(Response.Status.NOT_FOUND)
99 .type(MIMETYPE_TEXT).entity("Not found" + CRLF)
100 .build();
101 } catch (IOException e) {
102 servlet.getMetrics().incrementFailedGetRequests(1);
103 return Response.status(Response.Status.SERVICE_UNAVAILABLE)
104 .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
105 .build();
106 }
107 }
108 }