1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20 package org.apache.hadoop.hbase.monitoring;
21
22 import java.io.IOException;
23 import java.io.PrintWriter;
24 import java.util.Map;
25
26 import javax.servlet.http.HttpServlet;
27 import javax.servlet.http.HttpServletRequest;
28
29 import org.apache.hadoop.hbase.executor.ExecutorService;
30 import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorStatus;
31 import org.apache.hadoop.hbase.util.VersionInfo;
32
33 public abstract class StateDumpServlet extends HttpServlet {
34 static final long DEFAULT_TAIL_KB = 100;
35 private static final long serialVersionUID = 1L;
36
37 protected void dumpVersionInfo(PrintWriter out) {
38 VersionInfo.writeTo(out);
39
40 out.println("Hadoop " + org.apache.hadoop.util.VersionInfo.getVersion());
41 out.println("Subversion " + org.apache.hadoop.util.VersionInfo.getUrl() + " -r " +
42 org.apache.hadoop.util.VersionInfo.getRevision());
43 out.println("Compiled by " + org.apache.hadoop.util.VersionInfo.getUser() +
44 " on " + org.apache.hadoop.util.VersionInfo.getDate());
45 }
46
47 protected long getTailKbParam(HttpServletRequest request) {
48 String param = request.getParameter("tailkb");
49 if (param == null) {
50 return DEFAULT_TAIL_KB;
51 }
52 return Long.parseLong(param);
53 }
54
55 protected void dumpExecutors(ExecutorService service, PrintWriter out)
56 throws IOException {
57 Map<String, ExecutorStatus> statuses = service.getAllExecutorStatuses();
58 for (ExecutorStatus status : statuses.values()) {
59 status.dumpTo(out, " ");
60 }
61 }
62 }