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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  
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  
32  import org.apache.commons.logging.Log;
33  import org.apache.commons.logging.LogFactory;
34  
35  import org.apache.hadoop.classification.InterfaceAudience;
36  import org.apache.hadoop.hbase.ClusterStatus;
37  import org.apache.hadoop.hbase.ServerLoad;
38  import org.apache.hadoop.hbase.RegionLoad;
39  import org.apache.hadoop.hbase.ServerName;
40  import org.apache.hadoop.hbase.rest.model.StorageClusterStatusModel;
41  
42  @InterfaceAudience.Private
43  public class StorageClusterStatusResource extends ResourceBase {
44    private static final Log LOG =
45      LogFactory.getLog(StorageClusterStatusResource.class);
46  
47    static CacheControl cacheControl;
48    static {
49      cacheControl = new CacheControl();
50      cacheControl.setNoCache(true);
51      cacheControl.setNoTransform(false);
52    }
53  
54    /**
55     * Constructor
56     * @throws IOException
57     */
58    public StorageClusterStatusResource() throws IOException {
59      super();
60    }
61  
62    @GET
63    @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
64      MIMETYPE_PROTOBUF_IETF})
65    public Response get(final @Context UriInfo uriInfo) {
66      if (LOG.isDebugEnabled()) {
67        LOG.debug("GET " + uriInfo.getAbsolutePath());
68      }
69      servlet.getMetrics().incrementRequests(1);
70      try {
71        ClusterStatus status = servlet.getAdmin().getClusterStatus();
72        StorageClusterStatusModel model = new StorageClusterStatusModel();
73        model.setRegions(status.getRegionsCount());
74        model.setRequests(status.getRequestsCount());
75        model.setAverageLoad(status.getAverageLoad());
76        for (ServerName info: status.getServers()) {
77          ServerLoad load = status.getLoad(info);
78          StorageClusterStatusModel.Node node =
79            model.addLiveNode(
80              info.getHostname() + ":" +
81              Integer.toString(info.getPort()),
82              info.getStartcode(), load.getUsedHeapMB(),
83              load.getMaxHeapMB());
84          node.setRequests(load.getNumberOfRequests());
85          for (RegionLoad region: load.getRegionsLoad().values()) {
86            node.addRegion(region.getName(), region.getStores(),
87              region.getStorefiles(), region.getStorefileSizeMB(),
88              region.getMemStoreSizeMB(), region.getStorefileIndexSizeMB(),
89              region.getReadRequestsCount(), region.getWriteRequestsCount(),
90              region.getRootIndexSizeKB(), region.getTotalStaticIndexSizeKB(),
91              region.getTotalStaticBloomSizeKB(), region.getTotalCompactingKVs(),
92              region.getCurrentCompactedKVs());
93          }
94        }
95        for (ServerName name: status.getDeadServerNames()) {
96          model.addDeadNode(name.toString());
97        }
98        ResponseBuilder response = Response.ok(model);
99        response.cacheControl(cacheControl);
100       servlet.getMetrics().incrementSucessfulGetRequests(1);
101       return response.build();
102     } catch (IOException e) {
103       servlet.getMetrics().incrementFailedGetRequests(1);
104       return Response.status(Response.Status.SERVICE_UNAVAILABLE)
105         .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
106         .build();
107     }
108   }
109 }