HBASE-415 Rewrite leases to use DelayedBlockingQueue instead of polling
git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@619288 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jim Kellerman
parent
096ed2cf18
commit
0fdd555ace
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@ -27,6 +27,7 @@ Trunk (unreleased changes)
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HADOOP-2555 Refactor the HTable#get and HTable#getRow methods to avoid
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repetition of retry-on-failure logic (thanks to Peter Dolan and
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Bryan Duxbury)
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HBASE-415 Rewrite leases to use DelayedBlockingQueue instead of polling
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Release 0.16.0
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@ -46,6 +46,7 @@ import java.util.concurrent.locks.ReentrantLock;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.fs.FileStatus;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.PathFilter;
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@ -372,10 +373,10 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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Path p = HStoreFile.getMapDir(tabledir, split.getEncodedName(),
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family.getFamilyName());
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// Look for reference files. Call listPaths with an anonymous
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// Look for reference files. Call listStatus with an anonymous
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// instance of PathFilter.
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Path [] ps = fs.listPaths(p,
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FileStatus [] ps = fs.listStatus(p,
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new PathFilter () {
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public boolean accept(Path path) {
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return HStore.isReference(path);
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@ -1306,8 +1307,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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loadToServers.put(load, servers);
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if (!closed.get()) {
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long serverLabel = getServerLabel(s);
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serverLeases.createLease(serverLabel, serverLabel, new ServerExpirer(s));
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serverLeases.createLease(s, new ServerExpirer(s));
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}
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return createConfigurationSubset();
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@ -1327,15 +1327,10 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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return mw;
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}
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private long getServerLabel(final String s) {
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return s.hashCode();
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}
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/** {@inheritDoc} */
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public HMsg[] regionServerReport(HServerInfo serverInfo, HMsg msgs[])
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throws IOException {
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String serverName = serverInfo.getServerAddress().toString().trim();
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long serverLabel = getServerLabel(serverName);
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if (msgs.length > 0) {
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if (msgs[0].getMsg() == HMsg.MSG_REPORT_EXITING) {
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synchronized (serversToServerInfo) {
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@ -1348,7 +1343,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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": MSG_REPORT_EXITING -- cancelling lease");
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}
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if (cancelLease(serverName, serverLabel)) {
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if (cancelLease(serverName)) {
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// Only process the exit message if the server still has a lease.
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// Otherwise we could end up processing the server exit twice.
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LOG.info("Region server " + serverName +
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@ -1428,7 +1423,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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}
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synchronized (serversToServerInfo) {
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cancelLease(serverName, serverLabel);
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cancelLease(serverName);
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serversToServerInfo.notifyAll();
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}
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return new HMsg[]{new HMsg(HMsg.MSG_REGIONSERVER_STOP)};
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@ -1439,7 +1434,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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// This will always succeed; otherwise, the fetch of serversToServerInfo
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// would have failed above.
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serverLeases.renewLease(serverLabel, serverLabel);
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serverLeases.renewLease(serverName);
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// Refresh the info object and the load information
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@ -1476,7 +1471,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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}
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/** Cancel a server's lease and update its load information */
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private boolean cancelLease(final String serverName, final long serverLabel) {
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private boolean cancelLease(final String serverName) {
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boolean leaseCancelled = false;
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HServerInfo info = serversToServerInfo.remove(serverName);
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if (info != null) {
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@ -1487,7 +1482,7 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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unassignRootRegion();
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}
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LOG.info("Cancelling lease for " + serverName);
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serverLeases.cancelLease(serverLabel, serverLabel);
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serverLeases.cancelLease(serverName);
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leaseCancelled = true;
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// update load information
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@ -3120,20 +3115,20 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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/*
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* Data structure used to return results out of the toRowMap method.
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*/
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private class RowMap {
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class RowMap {
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final Text row;
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final SortedMap<Text, byte[]> map;
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private RowMap(final Text r, final SortedMap<Text, byte[]> m) {
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RowMap(final Text r, final SortedMap<Text, byte[]> m) {
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this.row = r;
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this.map = m;
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}
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private Text getRow() {
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Text getRow() {
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return this.row;
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}
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private SortedMap<Text, byte[]> getMap() {
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SortedMap<Text, byte[]> getMap() {
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return this.map;
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}
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}
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@ -1395,7 +1395,7 @@ public class HRegionServer implements HConstants, HRegionInterface, Runnable {
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if (s == null) {
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throw new UnknownScannerException("Name: " + scannerName);
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}
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this.leases.renewLease(scannerId, scannerId);
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this.leases.renewLease(scannerName);
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// Collect values to be returned here
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HbaseMapWritable values = new HbaseMapWritable();
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@ -1458,7 +1458,7 @@ public class HRegionServer implements HConstants, HRegionInterface, Runnable {
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scanners.put(scannerName, s);
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}
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this.leases.
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createLease(scannerId, scannerId, new ScannerListener(scannerName));
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createLease(scannerName, new ScannerListener(scannerName));
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return scannerId;
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} catch (IOException e) {
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LOG.error("Error opening scanner (fsOk: " + this.fsOk + ")",
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@ -1482,7 +1482,7 @@ public class HRegionServer implements HConstants, HRegionInterface, Runnable {
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throw new UnknownScannerException(scannerName);
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}
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s.close();
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this.leases.cancelLease(scannerId, scannerId);
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this.leases.cancelLease(scannerName);
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} catch (IOException e) {
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checkFileSystem();
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throw e;
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@ -21,9 +21,13 @@ package org.apache.hadoop.hbase;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import java.io.*;
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import java.util.*;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.ConcurrentModificationException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.Delayed;
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import java.util.concurrent.DelayQueue;
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import java.util.concurrent.TimeUnit;
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/**
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* Leases
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@ -39,19 +43,19 @@ import java.util.concurrent.atomic.AtomicBoolean;
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* An instance of the Leases class will create a thread to do its dirty work.
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* You should close() the instance if you want to clean up the thread properly.
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*/
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public class Leases {
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protected static final Log LOG = LogFactory.getLog(Leases.class.getName());
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public class Leases extends Thread {
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private static final Log LOG = LogFactory.getLog(Leases.class.getName());
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private final int leasePeriod;
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private final int leaseCheckFrequency;
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private volatile DelayQueue<Lease> leaseQueue = new DelayQueue<Lease>();
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protected final int leasePeriod;
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protected final int leaseCheckFrequency;
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private final Thread leaseMonitorThread;
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protected final Map<LeaseName, Lease> leases =
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new HashMap<LeaseName, Lease>();
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protected final TreeSet<Lease> sortedLeases = new TreeSet<Lease>();
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protected AtomicBoolean stop = new AtomicBoolean(false);
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protected final Map<String, Lease> leases = new HashMap<String, Lease>();
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protected final Map<String, LeaseListener> listeners =
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new HashMap<String, LeaseListener>();
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private volatile boolean stopRequested = false;
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/**
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* Creates a lease
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* Creates a lease monitor
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*
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* @param leasePeriod - length of time (milliseconds) that the lease is valid
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* @param leaseCheckFrequency - how often the lease should be checked
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@ -60,21 +64,39 @@ public class Leases {
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public Leases(final int leasePeriod, final int leaseCheckFrequency) {
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this.leasePeriod = leasePeriod;
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this.leaseCheckFrequency = leaseCheckFrequency;
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this.leaseMonitorThread =
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new LeaseMonitor(this.leaseCheckFrequency, this.stop);
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this.leaseMonitorThread.setDaemon(true);
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}
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/** Starts the lease monitor */
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public void start() {
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leaseMonitorThread.start();
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}
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/** {@inheritDoc} */
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@Override
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public void run() {
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while (!stopRequested || (stopRequested && leaseQueue.size() > 0) ) {
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Lease lease = null;
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try {
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lease = leaseQueue.poll(leaseCheckFrequency, TimeUnit.MILLISECONDS);
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/**
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* @param name Set name on the lease checking daemon thread.
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*/
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public void setName(final String name) {
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this.leaseMonitorThread.setName(name);
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} catch (InterruptedException e) {
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continue;
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} catch (ConcurrentModificationException e) {
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continue;
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}
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if (lease == null) {
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continue;
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}
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// A lease expired
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LeaseListener listener = null;
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synchronized (leaseQueue) {
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String leaseName = lease.getLeaseName();
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leases.remove(leaseName);
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listener = listeners.remove(leaseName);
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if (listener == null) {
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LOG.error("lease listener is null for lease " + leaseName);
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continue;
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}
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}
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listener.leaseExpired();
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}
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close();
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}
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/**
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@ -85,20 +107,7 @@ public class Leases {
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* allocation of new leases.
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*/
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public void closeAfterLeasesExpire() {
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synchronized(this.leases) {
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while (this.leases.size() > 0) {
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LOG.info(Thread.currentThread().getName() + " " +
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Integer.toString(leases.size()) + " lease(s) " +
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"outstanding. Waiting for them to expire.");
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try {
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this.leases.wait(this.leaseCheckFrequency);
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} catch (InterruptedException e) {
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// continue
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}
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}
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}
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// Now call close since no leases outstanding.
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close();
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this.stopRequested = true;
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}
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/**
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@ -107,271 +116,124 @@ public class Leases {
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*/
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public void close() {
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LOG.info(Thread.currentThread().getName() + " closing leases");
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this.stop.set(true);
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while (this.leaseMonitorThread.isAlive()) {
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try {
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this.leaseMonitorThread.interrupt();
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this.leaseMonitorThread.join();
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} catch (InterruptedException iex) {
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// Ignore
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}
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}
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synchronized(leases) {
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synchronized(sortedLeases) {
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this.stopRequested = true;
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synchronized (leaseQueue) {
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leaseQueue.clear();
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leases.clear();
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sortedLeases.clear();
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}
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listeners.clear();
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leaseQueue.notifyAll();
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}
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LOG.info(Thread.currentThread().getName() + " closed leases");
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}
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/* A client obtains a lease... */
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/**
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* Obtain a lease
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*
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* @param holderId id of lease holder
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* @param resourceId id of resource being leased
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* @param leaseName name of the lease
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* @param listener listener that will process lease expirations
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*/
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public void createLease(final long holderId, final long resourceId,
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final LeaseListener listener) {
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LeaseName name = null;
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synchronized(leases) {
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synchronized(sortedLeases) {
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Lease lease = new Lease(holderId, resourceId, listener);
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name = lease.getLeaseName();
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if(leases.get(name) != null) {
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throw new AssertionError("Impossible state for createLease(): " +
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"Lease " + name + " is still held.");
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public void createLease(String leaseName, final LeaseListener listener) {
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if (stopRequested) {
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return;
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}
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leases.put(name, lease);
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sortedLeases.add(lease);
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Lease lease = new Lease(leaseName, System.currentTimeMillis() + leasePeriod);
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synchronized (leaseQueue) {
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if (leases.containsKey(leaseName)) {
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throw new IllegalStateException("lease '" + leaseName +
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"' already exists");
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}
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leases.put(leaseName, lease);
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listeners.put(leaseName, listener);
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leaseQueue.add(lease);
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}
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// if (LOG.isDebugEnabled()) {
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// LOG.debug("Created lease " + name);
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// }
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}
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/* A client renews a lease... */
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/**
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* Renew a lease
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*
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* @param holderId id of lease holder
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* @param resourceId id of resource being leased
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* @throws IOException
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* @param leaseName name of lease
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*/
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public void renewLease(final long holderId, final long resourceId)
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throws IOException {
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LeaseName name = null;
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synchronized(leases) {
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synchronized(sortedLeases) {
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name = createLeaseName(holderId, resourceId);
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Lease lease = leases.get(name);
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public void renewLease(final String leaseName) {
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synchronized (leaseQueue) {
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Lease lease = leases.get(leaseName);
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if (lease == null) {
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// It's possible that someone tries to renew the lease, but
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// it just expired a moment ago. So fail.
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throw new IOException("Cannot renew lease that is not held: " +
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name);
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throw new IllegalArgumentException("lease '" + leaseName +
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"' does not exist");
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}
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sortedLeases.remove(lease);
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lease.renew();
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sortedLeases.add(lease);
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leaseQueue.remove(lease);
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lease.setExpirationTime(System.currentTimeMillis() + leasePeriod);
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leaseQueue.add(lease);
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}
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}
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// if (LOG.isDebugEnabled()) {
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// LOG.debug("Renewed lease " + name);
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// }
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}
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/**
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* Client explicitly cancels a lease.
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*
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* @param holderId id of lease holder
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* @param resourceId id of resource being leased
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* @param leaseName name of lease
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*/
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public void cancelLease(final long holderId, final long resourceId) {
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LeaseName name = null;
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synchronized(leases) {
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synchronized(sortedLeases) {
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name = createLeaseName(holderId, resourceId);
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Lease lease = leases.get(name);
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public void cancelLease(final String leaseName) {
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synchronized (leaseQueue) {
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Lease lease = leases.remove(leaseName);
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if (lease == null) {
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// It's possible that someone tries to renew the lease, but
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// it just expired a moment ago. So just skip it.
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return;
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throw new IllegalArgumentException("lease '" + leaseName +
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"' does not exist");
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}
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sortedLeases.remove(lease);
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leases.remove(name);
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leaseQueue.remove(lease);
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listeners.remove(leaseName);
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}
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}
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}
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/**
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* LeaseMonitor is a thread that expires Leases that go on too long.
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* Its a daemon thread.
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*/
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class LeaseMonitor extends Chore {
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/**
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* @param p
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* @param s
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*/
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public LeaseMonitor(int p, AtomicBoolean s) {
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super(p, s);
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}
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/** {@inheritDoc} */
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@Override
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protected void chore() {
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synchronized(leases) {
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synchronized(sortedLeases) {
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Lease top;
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while((sortedLeases.size() > 0)
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&& ((top = sortedLeases.first()) != null)) {
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if(top.shouldExpire()) {
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leases.remove(top.getLeaseName());
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sortedLeases.remove(top);
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top.expired();
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} else {
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break;
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}
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}
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}
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}
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}
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}
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/*
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* A Lease name.
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* More lightweight than String or Text.
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*/
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@SuppressWarnings("unchecked")
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class LeaseName implements Comparable {
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private final long holderId;
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private final long resourceId;
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LeaseName(final long hid, final long rid) {
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this.holderId = hid;
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this.resourceId = rid;
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}
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/** {@inheritDoc} */
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@Override
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public boolean equals(Object obj) {
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LeaseName other = (LeaseName)obj;
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return this.holderId == other.holderId &&
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this.resourceId == other.resourceId;
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}
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/** {@inheritDoc} */
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@Override
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public int hashCode() {
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// Copy OR'ing from javadoc for Long#hashCode.
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int result = (int)(this.holderId ^ (this.holderId >>> 32));
|
||||
result ^= (int)(this.resourceId ^ (this.resourceId >>> 32));
|
||||
return result;
|
||||
}
|
||||
|
||||
/** {@inheritDoc} */
|
||||
@Override
|
||||
public String toString() {
|
||||
return Long.toString(this.holderId) + "/" +
|
||||
Long.toString(this.resourceId);
|
||||
}
|
||||
|
||||
/** {@inheritDoc} */
|
||||
public int compareTo(Object obj) {
|
||||
LeaseName other = (LeaseName)obj;
|
||||
if (this.holderId < other.holderId) {
|
||||
return -1;
|
||||
}
|
||||
if (this.holderId > other.holderId) {
|
||||
return 1;
|
||||
}
|
||||
// holderIds are equal
|
||||
if (this.resourceId < other.resourceId) {
|
||||
return -1;
|
||||
}
|
||||
if (this.resourceId > other.resourceId) {
|
||||
return 1;
|
||||
}
|
||||
// Objects are equal
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/** Create a lease id out of the holder and resource ids. */
|
||||
protected LeaseName createLeaseName(final long hid, final long rid) {
|
||||
return new LeaseName(hid, rid);
|
||||
}
|
||||
|
||||
/** This class tracks a single Lease. */
|
||||
@SuppressWarnings("unchecked")
|
||||
private class Lease implements Comparable {
|
||||
final long holderId;
|
||||
final long resourceId;
|
||||
final LeaseListener listener;
|
||||
long lastUpdate;
|
||||
private LeaseName leaseId;
|
||||
private static class Lease implements Delayed {
|
||||
private final String leaseName;
|
||||
private long expirationTime;
|
||||
|
||||
Lease(final long holderId, final long resourceId,
|
||||
final LeaseListener listener) {
|
||||
this.holderId = holderId;
|
||||
this.resourceId = resourceId;
|
||||
this.listener = listener;
|
||||
renew();
|
||||
Lease(final String leaseName, long expirationTime) {
|
||||
this.leaseName = leaseName;
|
||||
this.expirationTime = expirationTime;
|
||||
}
|
||||
|
||||
synchronized LeaseName getLeaseName() {
|
||||
if (this.leaseId == null) {
|
||||
this.leaseId = createLeaseName(holderId, resourceId);
|
||||
}
|
||||
return this.leaseId;
|
||||
}
|
||||
|
||||
boolean shouldExpire() {
|
||||
return (System.currentTimeMillis() - lastUpdate > leasePeriod);
|
||||
}
|
||||
|
||||
void renew() {
|
||||
this.lastUpdate = System.currentTimeMillis();
|
||||
}
|
||||
|
||||
void expired() {
|
||||
LOG.info(Thread.currentThread().getName() + " lease expired " +
|
||||
getLeaseName());
|
||||
listener.leaseExpired();
|
||||
/** @return the lease name */
|
||||
public String getLeaseName() {
|
||||
return leaseName;
|
||||
}
|
||||
|
||||
/** {@inheritDoc} */
|
||||
@Override
|
||||
public boolean equals(Object obj) {
|
||||
return compareTo(obj) == 0;
|
||||
return this.hashCode() == ((Lease) obj).hashCode();
|
||||
}
|
||||
|
||||
/** {@inheritDoc} */
|
||||
@Override
|
||||
public int hashCode() {
|
||||
int result = this.getLeaseName().hashCode();
|
||||
result ^= this.lastUpdate;
|
||||
return result;
|
||||
return this.leaseName.hashCode();
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////////////
|
||||
// Comparable
|
||||
//////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
/** {@inheritDoc} */
|
||||
public int compareTo(Object o) {
|
||||
Lease other = (Lease) o;
|
||||
if(this.lastUpdate < other.lastUpdate) {
|
||||
return -1;
|
||||
} else if(this.lastUpdate > other.lastUpdate) {
|
||||
return 1;
|
||||
} else {
|
||||
return this.getLeaseName().compareTo(other.getLeaseName());
|
||||
public long getDelay(TimeUnit unit) {
|
||||
return unit.convert(this.expirationTime - System.currentTimeMillis(),
|
||||
TimeUnit.MILLISECONDS);
|
||||
}
|
||||
|
||||
/** {@inheritDoc} */
|
||||
public int compareTo(Delayed o) {
|
||||
long delta = this.getDelay(TimeUnit.MILLISECONDS) -
|
||||
o.getDelay(TimeUnit.MILLISECONDS);
|
||||
|
||||
int value = 0;
|
||||
if (delta > 0) {
|
||||
value = 1;
|
||||
|
||||
} else if (delta < 0) {
|
||||
value = -1;
|
||||
}
|
||||
return value;
|
||||
}
|
||||
|
||||
/** @param expirationTime the expirationTime to set */
|
||||
public void setExpirationTime(long expirationTime) {
|
||||
this.expirationTime = expirationTime;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue