Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.accumulo.monitor.servlets; import java.lang.management.ManagementFactory; import java.security.MessageDigest; import java.text.DateFormat; import java.util.ArrayList; import java.util.List; import java.util.Map.Entry; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.accumulo.core.Constants; import org.apache.accumulo.core.data.KeyExtent; import org.apache.accumulo.core.master.thrift.DeadServer; import org.apache.accumulo.core.master.thrift.MasterMonitorInfo; import org.apache.accumulo.core.master.thrift.TableInfo; import org.apache.accumulo.core.master.thrift.TabletServerStatus; import org.apache.accumulo.core.tabletserver.thrift.ActionStats; import org.apache.accumulo.core.tabletserver.thrift.TabletClientService; import org.apache.accumulo.core.tabletserver.thrift.TabletStats; import org.apache.accumulo.core.util.Duration; import org.apache.accumulo.core.util.ThriftUtil; import org.apache.accumulo.monitor.Monitor; import org.apache.accumulo.monitor.util.Table; import org.apache.accumulo.monitor.util.TableRow; import org.apache.accumulo.monitor.util.celltypes.CompactionsType; import org.apache.accumulo.monitor.util.celltypes.DateTimeType; import org.apache.accumulo.monitor.util.celltypes.DurationType; import org.apache.accumulo.monitor.util.celltypes.NumberType; import org.apache.accumulo.monitor.util.celltypes.PercentageType; import org.apache.accumulo.monitor.util.celltypes.ProgressChartType; import org.apache.accumulo.monitor.util.celltypes.TServerLinkType; import org.apache.accumulo.monitor.util.celltypes.TableLinkType; import org.apache.accumulo.server.master.state.TabletServerState; import org.apache.accumulo.server.security.SystemCredentials; import org.apache.accumulo.server.util.ActionStatsUpdator; import org.apache.accumulo.server.util.TableInfoUtil; import org.apache.accumulo.trace.instrument.Tracer; import org.apache.commons.codec.binary.Base64; import com.google.common.net.HostAndPort; public class TServersServlet extends BasicServlet { private static final long serialVersionUID = 1L; private static final TabletServerStatus NO_STATUS = new TabletServerStatus(); static class SecondType extends NumberType<Double> { @Override public String format(Object obj) { if (obj == null) return "—"; return Duration.format((long) (1000.0 * (Double) obj)); } } @Override protected String getTitle(HttpServletRequest req) { return "Tablet Server Status"; } @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 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); HostAndPort address = HostAndPort.fromString(tserverAddress); 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 Current Operations"); perTabletResults.setSubCaption("Per-tablet 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 Avg", new SecondType(), null); perTabletResults.addSortableColumn("Minor Std Dev", new SecondType(), null); perTabletResults.addSortableColumn("Minor Avg e/s", new NumberType<Double>(), null); perTabletResults.addSortableColumn("Major Avg", new SecondType(), null); perTabletResults.addSortableColumn("Major Std Dev", new SecondType(), null); perTabletResults.addSortableColumn("Major Avg e/s", new NumberType<Double>(), null); for (TabletStats info : tsStats) { if (info.extent == null) { historical = info; continue; } total.numEntries += info.numEntries; ActionStatsUpdator.update(total.minors, info.minors); ActionStatsUpdator.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()), Constants.UTF8); 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 ActionStatsUpdator.update(total.minors, historical.minors); ActionStatsUpdator.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); } private void doCurrentTabletOps(HttpServletRequest req, StringBuilder sb, double currentMinorAvg, double currentMinorStdDev, double currentMajorAvg, double currentMajorStdDev) { Table currentTabletOps = new Table("currentTabletOps", "Current Tablet Operation Results"); currentTabletOps.addSortableColumn("Minor Average", new SecondType(), null); currentTabletOps.addSortableColumn("Minor Std Dev", new SecondType(), null); currentTabletOps.addSortableColumn("Major Avg", new SecondType(), null); currentTabletOps.addSortableColumn("Major Std Dev", new SecondType(), null); currentTabletOps.addRow(currentMinorAvg, currentMinorStdDev, currentMajorAvg, currentMajorStdDev); currentTabletOps.generate(req, sb); } private void doAllTimeTable(HttpServletRequest req, StringBuilder sb, TabletStats total, TabletStats historical, double majorQueueStdDev, double minorQueueStdDev, double totalElapsedForAll, double splitStdDev, double majorStdDev, double minorStdDev) { Table opHistoryDetails = new Table("opHistoryDetails", "All-Time Tablet Operation Results"); opHistoryDetails.addSortableColumn("Operation"); opHistoryDetails.addSortableColumn("Success", new NumberType<Integer>(), null); opHistoryDetails.addSortableColumn("Failure", new NumberType<Integer>(), null); opHistoryDetails.addSortableColumn("Average<br />Queue Time", new SecondType(), null); opHistoryDetails.addSortableColumn("Std. Dev.<br />Queue Time", new SecondType(), null); opHistoryDetails.addSortableColumn("Average<br />Time", new SecondType(), null); opHistoryDetails.addSortableColumn("Std. Dev.<br />Time", new SecondType(), null); opHistoryDetails.addSortableColumn("Percentage Time Spent", new ProgressChartType(totalElapsedForAll), null); opHistoryDetails.addRow("Split", historical.splits.num, historical.splits.fail, null, null, historical.splits.num != 0 ? (historical.splits.elapsed / historical.splits.num) : null, splitStdDev, historical.splits.elapsed); opHistoryDetails.addRow("Major Compaction", total.majors.num, total.majors.fail, total.majors.num != 0 ? (total.majors.queueTime / total.majors.num) : null, majorQueueStdDev, total.majors.num != 0 ? (total.majors.elapsed / total.majors.num) : null, majorStdDev, total.majors.elapsed); opHistoryDetails.addRow("Minor Compaction", total.minors.num, total.minors.fail, total.minors.num != 0 ? (total.minors.queueTime / total.minors.num) : null, minorQueueStdDev, total.minors.num != 0 ? (total.minors.elapsed / total.minors.num) : null, minorStdDev, total.minors.elapsed); opHistoryDetails.generate(req, sb); } private void doDetailTable(HttpServletRequest req, StringBuilder sb, HostAndPort address, int numTablets, TabletStats total, TabletStats historical) { Table detailTable = new Table("tServerDetail", "Details"); detailTable.setSubCaption(address.getHostText() + ":" + address.getPort()); detailTable.addSortableColumn("Hosted Tablets", new NumberType<Integer>(), null); detailTable.addSortableColumn("Entries", new NumberType<Long>(), null); detailTable.addSortableColumn("Minor Compacting", new NumberType<Integer>(), null); detailTable.addSortableColumn("Major Compacting", new NumberType<Integer>(), null); detailTable.addSortableColumn("Splitting", new NumberType<Integer>(), null); detailTable.addRow(numTablets, total.numEntries, total.minors.status, total.majors.status, historical.splits.status); detailTable.generate(req, sb); } /* * omg there's so much undocumented stuff going on here. First, sumDev is a partial standard deviation computation. It is the (clue 1) sum of the squares of * (clue 2) seconds of elapsed time. */ private static double stddev(double elapsed, double num, double sumDev) { if (num != 0) { double average = elapsed / num; return Math.sqrt((sumDev / num) - (average * average)); } return 0; } private void doBadTserverList(HttpServletRequest req, StringBuilder sb) { if (Monitor.getMmi() != null && !Monitor.getMmi().badTServers.isEmpty()) { Table badTServerList = new Table("badtservers", "Non-Functioning Tablet Servers", "error"); badTServerList.setSubCaption("The following tablet servers reported a status other than Online."); badTServerList.addSortableColumn("Tablet Server"); badTServerList.addSortableColumn("Tablet Server Status"); for (Entry<String, Byte> badserver : Monitor.getMmi().badTServers.entrySet()) badTServerList.addRow(badserver.getKey(), TabletServerState.getStateById(badserver.getValue()).name()); badTServerList.generate(req, sb); } } private void doDeadTserverList(HttpServletRequest req, StringBuilder sb) { MasterMonitorInfo mmi = Monitor.getMmi(); if (mmi != null) { List<DeadServer> obit = mmi.deadTabletServers; Table deadTServerList = new Table("deaddtservers", "Dead Tablet Servers", "error"); deadTServerList.setSubCaption("The following tablet servers are no longer reachable."); doDeadServerTable(req, sb, deadTServerList, obit); } } public static void doDeadServerTable(HttpServletRequest req, StringBuilder sb, Table deadTServerList, List<DeadServer> obit) { if (obit != null && !obit.isEmpty()) { deadTServerList.addSortableColumn("Server"); deadTServerList.addSortableColumn("Last Updated", new DateTimeType(DateFormat.MEDIUM, DateFormat.SHORT), null); deadTServerList.addSortableColumn("Event"); deadTServerList.addUnsortableColumn("Clear"); for (DeadServer dead : obit) deadTServerList.addRow(TServerLinkType.displayName(dead.server), dead.lastStatus, dead.status, "<a href='/op?action=clearDeadServer&redir=" + currentPage(req) + "&server=" + encode(dead.server) + "'>clear</a>"); deadTServerList.generate(req, sb); } } static void doTserverList(HttpServletRequest req, StringBuilder sb, List<TabletServerStatus> tservers, String tableId, Table tServerList) { int guessHighLoad = ManagementFactory.getOperatingSystemMXBean().getAvailableProcessors(); long now = System.currentTimeMillis(); double avgLastContact = 0.; for (TabletServerStatus status : tservers) { avgLastContact += (now - status.lastContact); } final long MINUTES = 3 * 60 * 1000; tServerList.addSortableColumn("Server", new TServerLinkType(), null); tServerList.addSortableColumn("Hosted Tablets", new NumberType<Integer>(0, Integer.MAX_VALUE), null); tServerList.addSortableColumn("Last Contact", new DurationType(0l, (long) Math.min(avgLastContact * 4, MINUTES)), null); tServerList.addSortableColumn("Entries", new NumberType<Long>(), "The number of key/value pairs."); tServerList.addSortableColumn("Ingest", new NumberType<Long>(), "The number of key/value pairs inserted. (Note that deletes are also 'inserted')"); tServerList.addSortableColumn("Query", new NumberType<Long>(), "The number of key/value pairs returned to clients. (Not the number of scans)"); tServerList.addSortableColumn("Hold Time", new DurationType(), "The amount of time ingest is suspended waiting for data to be written to disk."); tServerList.addSortableColumn("Running<br />Scans", new CompactionsType("scans"), "The number of scans running and queued on this tablet server."); tServerList.addSortableColumn("Minor<br />Compactions", new CompactionsType("minor"), "The number of minor compactions running and (queued waiting for resources). Minor compactions are the operations where entries are flushed from memory to disk."); tServerList.addSortableColumn("Major<br />Compactions", new CompactionsType("major"), "The number of major compactions running and (queued waiting for resources). " + "Major compactions are the operations where many smaller files are grouped into a larger file, eliminating duplicates and cleaning up deletes."); tServerList.addSortableColumn("Index Cache<br />Hit Rate", new PercentageType(), "The recent index cache hit rate."); tServerList.addSortableColumn("Data Cache<br />Hit Rate", new PercentageType(), "The recent data cache hit rate."); tServerList.addSortableColumn("OS Load", new NumberType<Double>(0., guessHighLoad * 1., 0., guessHighLoad * 3.), "The Unix one minute load average. The average number of processes in the run queue over a one minute interval."); log.debug("tableId: " + tableId); for (TabletServerStatus status : tservers) { if (status == null) status = NO_STATUS; TableInfo summary = TableInfoUtil.summarizeTableStats(status); if (tableId != null) summary = status.tableMap.get(tableId); if (summary == null) continue; TableRow row = tServerList.prepareRow(); row.add(status); // add for server name row.add(summary.tablets); row.add(now - status.lastContact); row.add(summary.recs); row.add(summary.ingestRate); row.add(summary.queryRate); row.add(status.holdTime); row.add(summary); // add for scans row.add(summary); // add for minor compactions row.add(summary); // add for major compactions double indexCacheHitRate = status.indexCacheHits / (double) Math.max(status.indexCacheRequest, 1); row.add(indexCacheHitRate); double dataCacheHitRate = status.dataCacheHits / (double) Math.max(status.dataCacheRequest, 1); row.add(dataCacheHitRate); row.add(status.osLoad); tServerList.addRow(row); } tServerList.generate(req, sb); } }