TabletServerStatus getStatus(TServerInstance server) {
   TabletServerStatus result = new TabletServerStatus();
   result.tableMap = new HashMap<String, TableInfo>();
   for (KeyExtent extent : extents) {
     String table = extent.getTableId().toString();
     TableInfo info = result.tableMap.get(table);
     if (info == null) result.tableMap.put(table, info = new TableInfo());
     info.onlineTablets++;
     info.recs = info.onlineTablets;
     info.ingestRate = 123.;
     info.queryRate = 456.;
   }
   return result;
 }
  @Override
  protected void pageBody(HttpServletRequest req, HttpServletResponse response, StringBuilder sb)
      throws Exception {
    String tserverAddress = req.getParameter("s");

    // Check to make sure tserver is a known address
    boolean tserverExists = false;
    if (tserverAddress != null && tserverAddress.isEmpty() == false) {
      for (TabletServerStatus ts : Monitor.getMmi().getTServerInfo()) {
        if (tserverAddress.equals(ts.getName())) {
          tserverExists = true;
          break;
        }
      }
    }

    if (tserverAddress == null || tserverAddress.isEmpty() || tserverExists == false) {
      doBadTserverList(req, sb);

      doDeadTserverList(req, sb);

      ArrayList<TabletServerStatus> tservers = new ArrayList<TabletServerStatus>();
      if (Monitor.getMmi() != null) tservers.addAll(Monitor.getMmi().tServerInfo);

      Table tServerList = new Table("tservers", "Tablet&nbsp;Servers");
      tServerList.setSubCaption(
          "Click on the <span style='color: #0000ff;'>server address</span> to view detailed performance statistics for that server.");

      doTserverList(req, sb, tservers, null, tServerList);
      return;
    }

    double totalElapsedForAll = 0;
    double splitStdDev = 0;
    double minorStdDev = 0;
    double minorQueueStdDev = 0;
    double majorStdDev = 0;
    double majorQueueStdDev = 0;
    double currentMinorAvg = 0;
    double currentMajorAvg = 0;
    double currentMinorStdDev = 0;
    double currentMajorStdDev = 0;
    TabletStats total =
        new TabletStats(null, new ActionStats(), new ActionStats(), new ActionStats(), 0, 0, 0, 0);

    InetSocketAddress address = AddressUtil.parseAddress(tserverAddress, -1);
    TabletStats historical =
        new TabletStats(null, new ActionStats(), new ActionStats(), new ActionStats(), 0, 0, 0, 0);
    List<TabletStats> tsStats = new ArrayList<TabletStats>();
    try {
      TabletClientService.Client client =
          ThriftUtil.getClient(
              new TabletClientService.Client.Factory(), address, Monitor.getSystemConfiguration());
      try {
        for (String tableId : Monitor.getMmi().tableMap.keySet()) {
          tsStats.addAll(
              client.getTabletStats(
                  Tracer.traceInfo(),
                  SystemCredentials.get().toThrift(Monitor.getInstance()),
                  tableId));
        }
        historical =
            client.getHistoricalStats(
                Tracer.traceInfo(), SystemCredentials.get().toThrift(Monitor.getInstance()));
      } finally {
        ThriftUtil.returnClient(client);
      }
    } catch (Exception e) {
      banner(sb, "error", "No Such Tablet ServerAvailable");
      log.error(e, e);
      return;
    }

    Table perTabletResults = new Table("perTabletResults", "Detailed&nbsp;Current&nbsp;Operations");
    perTabletResults.setSubCaption("Per-tablet&nbsp;Details");
    perTabletResults.addSortableColumn("Table", new TableLinkType(), null);
    perTabletResults.addSortableColumn("Tablet");
    perTabletResults.addSortableColumn("Entries", new NumberType<Long>(), null);
    perTabletResults.addSortableColumn("Ingest", new NumberType<Long>(), null);
    perTabletResults.addSortableColumn("Query", new NumberType<Long>(), null);
    perTabletResults.addSortableColumn("Minor&nbsp;Avg", new SecondType(), null);
    perTabletResults.addSortableColumn("Minor&nbsp;Std&nbsp;Dev", new SecondType(), null);
    perTabletResults.addSortableColumn("Minor&nbsp;Avg&nbsp;e/s", new NumberType<Double>(), null);
    perTabletResults.addSortableColumn("Major&nbsp;Avg", new SecondType(), null);
    perTabletResults.addSortableColumn("Major&nbsp;Std&nbsp;Dev", new SecondType(), null);
    perTabletResults.addSortableColumn("Major&nbsp;Avg&nbsp;e/s", new NumberType<Double>(), null);

    for (TabletStats info : tsStats) {
      if (info.extent == null) {
        historical = info;
        continue;
      }
      total.numEntries += info.numEntries;
      TabletStatsKeeper.update(total.minors, info.minors);
      TabletStatsKeeper.update(total.majors, info.majors);

      KeyExtent extent = new KeyExtent(info.extent);
      String tableId = extent.getTableId().toString();
      MessageDigest digester = MessageDigest.getInstance("MD5");
      if (extent.getEndRow() != null && extent.getEndRow().getLength() > 0) {
        digester.update(extent.getEndRow().getBytes(), 0, extent.getEndRow().getLength());
      }
      String obscuredExtent = new String(Base64.encodeBase64(digester.digest()));
      String displayExtent = String.format("<code>[%s]</code>", obscuredExtent);

      TableRow row = perTabletResults.prepareRow();
      row.add(tableId);
      row.add(displayExtent);
      row.add(info.numEntries);
      row.add(info.ingestRate);
      row.add(info.queryRate);
      row.add(info.minors.num != 0 ? info.minors.elapsed / info.minors.num : null);
      row.add(stddev(info.minors.elapsed, info.minors.num, info.minors.sumDev));
      row.add(info.minors.elapsed != 0 ? info.minors.count / info.minors.elapsed : null);
      row.add(info.majors.num != 0 ? info.majors.elapsed / info.majors.num : null);
      row.add(stddev(info.majors.elapsed, info.majors.num, info.majors.sumDev));
      row.add(info.majors.elapsed != 0 ? info.majors.count / info.majors.elapsed : null);
      perTabletResults.addRow(row);
    }

    // Calculate current averages oldServer adding in historical data
    if (total.minors.num != 0) currentMinorAvg = (long) (total.minors.elapsed / total.minors.num);
    if (total.minors.elapsed != 0 && total.minors.num != 0)
      currentMinorStdDev = stddev(total.minors.elapsed, total.minors.num, total.minors.sumDev);
    if (total.majors.num != 0) currentMajorAvg = total.majors.elapsed / total.majors.num;
    if (total.majors.elapsed != 0
        && total.majors.num != 0
        && total.majors.elapsed > total.majors.num)
      currentMajorStdDev = stddev(total.majors.elapsed, total.majors.num, total.majors.sumDev);

    // After these += operations, these variables are now total for current
    // tablets and historical tablets
    TabletStatsKeeper.update(total.minors, historical.minors);
    TabletStatsKeeper.update(total.majors, historical.majors);
    totalElapsedForAll += total.majors.elapsed + historical.splits.elapsed + total.minors.elapsed;

    minorStdDev = stddev(total.minors.elapsed, total.minors.num, total.minors.sumDev);
    minorQueueStdDev = stddev(total.minors.queueTime, total.minors.num, total.minors.queueSumDev);
    majorStdDev = stddev(total.majors.elapsed, total.majors.num, total.majors.sumDev);
    majorQueueStdDev = stddev(total.majors.queueTime, total.majors.num, total.majors.queueSumDev);
    splitStdDev =
        stddev(historical.splits.num, historical.splits.elapsed, historical.splits.sumDev);

    doDetailTable(req, sb, address, tsStats.size(), total, historical);
    doAllTimeTable(
        req,
        sb,
        total,
        historical,
        majorQueueStdDev,
        minorQueueStdDev,
        totalElapsedForAll,
        splitStdDev,
        majorStdDev,
        minorStdDev);
    doCurrentTabletOps(
        req, sb, currentMinorAvg, currentMinorStdDev, currentMajorAvg, currentMajorStdDev);
    perTabletResults.generate(req, sb);
  }