| /* |
| * |
| * 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.hadoop.hbase.master; |
| |
| import static org.apache.hadoop.hbase.util.ConcurrentMapUtils.computeIfAbsent; |
| |
| import java.io.IOException; |
| import java.net.InetAddress; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentNavigableMap; |
| import java.util.concurrent.ConcurrentSkipListMap; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.function.Predicate; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.ClockOutOfSyncException; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.NotServingRegionException; |
| import org.apache.hadoop.hbase.RegionMetrics; |
| import org.apache.hadoop.hbase.ScheduledChore; |
| import org.apache.hadoop.hbase.ServerMetrics; |
| import org.apache.hadoop.hbase.ServerMetricsBuilder; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.YouAreDeadException; |
| import org.apache.hadoop.hbase.client.AsyncClusterConnection; |
| import org.apache.hadoop.hbase.client.AsyncRegionServerAdmin; |
| import org.apache.hadoop.hbase.client.RegionInfo; |
| import org.apache.hadoop.hbase.ipc.RemoteWithExtrasException; |
| import org.apache.hadoop.hbase.master.assignment.RegionStates; |
| import org.apache.hadoop.hbase.master.procedure.ServerCrashProcedure; |
| import org.apache.hadoop.hbase.monitoring.MonitoredTask; |
| import org.apache.hadoop.hbase.procedure2.Procedure; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.hadoop.hbase.util.CommonFSUtils; |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| import org.apache.hadoop.hbase.util.FutureUtils; |
| import org.apache.hadoop.hbase.zookeeper.ZKUtil; |
| import org.apache.hadoop.hbase.zookeeper.ZKWatcher; |
| import org.apache.hadoop.hbase.zookeeper.ZNodePaths; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.apache.zookeeper.KeeperException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hbase.thirdparty.com.google.protobuf.ByteString; |
| import org.apache.hbase.thirdparty.com.google.protobuf.UnsafeByteOperations; |
| |
| import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil; |
| import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.ClusterStatusProtos.RegionStoreSequenceIds; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.ClusterStatusProtos.StoreSequenceId; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.FlushedRegionSequenceId; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.FlushedSequenceId; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.FlushedStoreSequenceId; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionServerStartupRequest; |
| |
| /** |
| * The ServerManager class manages info about region servers. |
| * <p> |
| * Maintains lists of online and dead servers. Processes the startups, |
| * shutdowns, and deaths of region servers. |
| * <p> |
| * Servers are distinguished in two different ways. A given server has a |
| * location, specified by hostname and port, and of which there can only be one |
| * online at any given time. A server instance is specified by the location |
| * (hostname and port) as well as the startcode (timestamp from when the server |
| * was started). This is used to differentiate a restarted instance of a given |
| * server from the original instance. |
| * <p> |
| * If a sever is known not to be running any more, it is called dead. The dead |
| * server needs to be handled by a ServerShutdownHandler. If the handler is not |
| * enabled yet, the server can't be handled right away so it is queued up. |
| * After the handler is enabled, the server will be submitted to a handler to handle. |
| * However, the handler may be just partially enabled. If so, |
| * the server cannot be fully processed, and be queued up for further processing. |
| * A server is fully processed only after the handler is fully enabled |
| * and has completed the handling. |
| */ |
| @InterfaceAudience.Private |
| public class ServerManager { |
| public static final String WAIT_ON_REGIONSERVERS_MAXTOSTART = |
| "hbase.master.wait.on.regionservers.maxtostart"; |
| |
| public static final String WAIT_ON_REGIONSERVERS_MINTOSTART = |
| "hbase.master.wait.on.regionservers.mintostart"; |
| |
| public static final String WAIT_ON_REGIONSERVERS_TIMEOUT = |
| "hbase.master.wait.on.regionservers.timeout"; |
| |
| public static final String WAIT_ON_REGIONSERVERS_INTERVAL = |
| "hbase.master.wait.on.regionservers.interval"; |
| |
| /** |
| * see HBASE-20727 |
| * if set to true, flushedSequenceIdByRegion and storeFlushedSequenceIdsByRegion |
| * will be persisted to HDFS and loaded when master restart to speed up log split |
| */ |
| public static final String PERSIST_FLUSHEDSEQUENCEID = |
| "hbase.master.persist.flushedsequenceid.enabled"; |
| |
| public static final boolean PERSIST_FLUSHEDSEQUENCEID_DEFAULT = true; |
| |
| public static final String FLUSHEDSEQUENCEID_FLUSHER_INTERVAL = |
| "hbase.master.flushedsequenceid.flusher.interval"; |
| |
| public static final int FLUSHEDSEQUENCEID_FLUSHER_INTERVAL_DEFAULT = |
| 3 * 60 * 60 * 1000; // 3 hours |
| |
| public static final String MAX_CLOCK_SKEW_MS = "hbase.master.maxclockskew"; |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ServerManager.class); |
| |
| // Set if we are to shutdown the cluster. |
| private AtomicBoolean clusterShutdown = new AtomicBoolean(false); |
| |
| /** |
| * The last flushed sequence id for a region. |
| */ |
| private final ConcurrentNavigableMap<byte[], Long> flushedSequenceIdByRegion = |
| new ConcurrentSkipListMap<>(Bytes.BYTES_COMPARATOR); |
| |
| private boolean persistFlushedSequenceId = true; |
| private volatile boolean isFlushSeqIdPersistInProgress = false; |
| /** File on hdfs to store last flushed sequence id of regions */ |
| private static final String LAST_FLUSHED_SEQ_ID_FILE = ".lastflushedseqids"; |
| private FlushedSequenceIdFlusher flushedSeqIdFlusher; |
| |
| |
| /** |
| * The last flushed sequence id for a store in a region. |
| */ |
| private final ConcurrentNavigableMap<byte[], ConcurrentNavigableMap<byte[], Long>> |
| storeFlushedSequenceIdsByRegion = new ConcurrentSkipListMap<>(Bytes.BYTES_COMPARATOR); |
| |
| /** Map of registered servers to their current load */ |
| private final ConcurrentNavigableMap<ServerName, ServerMetrics> onlineServers = |
| new ConcurrentSkipListMap<>(); |
| |
| /** List of region servers that should not get any more new regions. */ |
| private final ArrayList<ServerName> drainingServers = new ArrayList<>(); |
| |
| private final MasterServices master; |
| |
| private final DeadServer deadservers = new DeadServer(); |
| |
| private final long maxSkew; |
| private final long warningSkew; |
| |
| /** Listeners that are called on server events. */ |
| private List<ServerListener> listeners = new CopyOnWriteArrayList<>(); |
| |
| /** |
| * Constructor. |
| */ |
| public ServerManager(final MasterServices master) { |
| this.master = master; |
| Configuration c = master.getConfiguration(); |
| maxSkew = c.getLong(MAX_CLOCK_SKEW_MS, 30000); |
| warningSkew = c.getLong("hbase.master.warningclockskew", 10000); |
| persistFlushedSequenceId = c.getBoolean(PERSIST_FLUSHEDSEQUENCEID, |
| PERSIST_FLUSHEDSEQUENCEID_DEFAULT); |
| } |
| |
| /** |
| * Add the listener to the notification list. |
| * @param listener The ServerListener to register |
| */ |
| public void registerListener(final ServerListener listener) { |
| this.listeners.add(listener); |
| } |
| |
| /** |
| * Remove the listener from the notification list. |
| * @param listener The ServerListener to unregister |
| */ |
| public boolean unregisterListener(final ServerListener listener) { |
| return this.listeners.remove(listener); |
| } |
| |
| /** |
| * Let the server manager know a new regionserver has come online |
| * @param request the startup request |
| * @param versionNumber the version number of the new regionserver |
| * @param version the version of the new regionserver, could contain strings like "SNAPSHOT" |
| * @param ia the InetAddress from which request is received |
| * @return The ServerName we know this server as. |
| * @throws IOException |
| */ |
| ServerName regionServerStartup(RegionServerStartupRequest request, int versionNumber, |
| String version, InetAddress ia) throws IOException { |
| // Test for case where we get a region startup message from a regionserver |
| // that has been quickly restarted but whose znode expiration handler has |
| // not yet run, or from a server whose fail we are currently processing. |
| // Test its host+port combo is present in serverAddressToServerInfo. If it |
| // is, reject the server and trigger its expiration. The next time it comes |
| // in, it should have been removed from serverAddressToServerInfo and queued |
| // for processing by ProcessServerShutdown. |
| |
| final String hostname = |
| request.hasUseThisHostnameInstead() ? request.getUseThisHostnameInstead() : ia.getHostName(); |
| ServerName sn = ServerName.valueOf(hostname, request.getPort(), request.getServerStartCode()); |
| checkClockSkew(sn, request.getServerCurrentTime()); |
| checkIsDead(sn, "STARTUP"); |
| if (!checkAndRecordNewServer(sn, ServerMetricsBuilder.of(sn, versionNumber, version))) { |
| LOG.warn( |
| "THIS SHOULD NOT HAPPEN, RegionServerStartup" + " could not record the server: " + sn); |
| } |
| return sn; |
| } |
| |
| /** |
| * Updates last flushed sequence Ids for the regions on server sn |
| * @param sn |
| * @param hsl |
| */ |
| private void updateLastFlushedSequenceIds(ServerName sn, ServerMetrics hsl) { |
| for (Entry<byte[], RegionMetrics> entry : hsl.getRegionMetrics().entrySet()) { |
| byte[] encodedRegionName = Bytes.toBytes(RegionInfo.encodeRegionName(entry.getKey())); |
| Long existingValue = flushedSequenceIdByRegion.get(encodedRegionName); |
| long l = entry.getValue().getCompletedSequenceId(); |
| // Don't let smaller sequence ids override greater sequence ids. |
| if (LOG.isTraceEnabled()) { |
| LOG.trace(Bytes.toString(encodedRegionName) + ", existingValue=" + existingValue + |
| ", completeSequenceId=" + l); |
| } |
| if (existingValue == null || (l != HConstants.NO_SEQNUM && l > existingValue)) { |
| flushedSequenceIdByRegion.put(encodedRegionName, l); |
| } else if (l != HConstants.NO_SEQNUM && l < existingValue) { |
| LOG.warn("RegionServer " + sn + " indicates a last flushed sequence id (" |
| + l + ") that is less than the previous last flushed sequence id (" |
| + existingValue + ") for region " + Bytes.toString(entry.getKey()) + " Ignoring."); |
| } |
| ConcurrentNavigableMap<byte[], Long> storeFlushedSequenceId = |
| computeIfAbsent(storeFlushedSequenceIdsByRegion, encodedRegionName, |
| () -> new ConcurrentSkipListMap<>(Bytes.BYTES_COMPARATOR)); |
| for (Entry<byte[], Long> storeSeqId : entry.getValue().getStoreSequenceId().entrySet()) { |
| byte[] family = storeSeqId.getKey(); |
| existingValue = storeFlushedSequenceId.get(family); |
| l = storeSeqId.getValue(); |
| if (LOG.isTraceEnabled()) { |
| LOG.trace(Bytes.toString(encodedRegionName) + ", family=" + Bytes.toString(family) + |
| ", existingValue=" + existingValue + ", completeSequenceId=" + l); |
| } |
| // Don't let smaller sequence ids override greater sequence ids. |
| if (existingValue == null || (l != HConstants.NO_SEQNUM && l > existingValue.longValue())) { |
| storeFlushedSequenceId.put(family, l); |
| } |
| } |
| } |
| } |
| |
| public void regionServerReport(ServerName sn, |
| ServerMetrics sl) throws YouAreDeadException { |
| checkIsDead(sn, "REPORT"); |
| if (null == this.onlineServers.replace(sn, sl)) { |
| // Already have this host+port combo and its just different start code? |
| // Just let the server in. Presume master joining a running cluster. |
| // recordNewServer is what happens at the end of reportServerStartup. |
| // The only thing we are skipping is passing back to the regionserver |
| // the ServerName to use. Here we presume a master has already done |
| // that so we'll press on with whatever it gave us for ServerName. |
| if (!checkAndRecordNewServer(sn, sl)) { |
| LOG.info("RegionServerReport ignored, could not record the server: " + sn); |
| return; // Not recorded, so no need to move on |
| } |
| } |
| updateLastFlushedSequenceIds(sn, sl); |
| } |
| |
| /** |
| * Check is a server of same host and port already exists, |
| * if not, or the existed one got a smaller start code, record it. |
| * |
| * @param serverName the server to check and record |
| * @param sl the server load on the server |
| * @return true if the server is recorded, otherwise, false |
| */ |
| boolean checkAndRecordNewServer(final ServerName serverName, final ServerMetrics sl) { |
| ServerName existingServer = null; |
| synchronized (this.onlineServers) { |
| existingServer = findServerWithSameHostnamePortWithLock(serverName); |
| if (existingServer != null && (existingServer.getStartcode() > serverName.getStartcode())) { |
| LOG.info("Server serverName=" + serverName + " rejected; we already have " |
| + existingServer.toString() + " registered with same hostname and port"); |
| return false; |
| } |
| recordNewServerWithLock(serverName, sl); |
| } |
| |
| // Tell our listeners that a server was added |
| if (!this.listeners.isEmpty()) { |
| for (ServerListener listener : this.listeners) { |
| listener.serverAdded(serverName); |
| } |
| } |
| |
| // Note that we assume that same ts means same server, and don't expire in that case. |
| // TODO: ts can theoretically collide due to clock shifts, so this is a bit hacky. |
| if (existingServer != null && |
| (existingServer.getStartcode() < serverName.getStartcode())) { |
| LOG.info("Triggering server recovery; existingServer " + |
| existingServer + " looks stale, new server:" + serverName); |
| expireServer(existingServer); |
| } |
| return true; |
| } |
| |
| /** |
| * Find out the region servers crashed between the crash of the previous master instance and the |
| * current master instance and schedule SCP for them. |
| * <p/> |
| * Since the {@code RegionServerTracker} has already helped us to construct the online servers set |
| * by scanning zookeeper, now we can compare the online servers with {@code liveServersFromWALDir} |
| * to find out whether there are servers which are already dead. |
| * <p/> |
| * Must be called inside the initialization method of {@code RegionServerTracker} to avoid |
| * concurrency issue. |
| * @param deadServersFromPE the region servers which already have a SCP associated. |
| * @param liveServersFromWALDir the live region servers from wal directory. |
| */ |
| void findDeadServersAndProcess(Set<ServerName> deadServersFromPE, |
| Set<ServerName> liveServersFromWALDir) { |
| deadServersFromPE.forEach(deadservers::putIfAbsent); |
| liveServersFromWALDir.stream().filter(sn -> !onlineServers.containsKey(sn)) |
| .forEach(this::expireServer); |
| } |
| |
| /** |
| * Checks if the clock skew between the server and the master. If the clock skew exceeds the |
| * configured max, it will throw an exception; if it exceeds the configured warning threshold, |
| * it will log a warning but start normally. |
| * @param serverName Incoming servers's name |
| * @param serverCurrentTime |
| * @throws ClockOutOfSyncException if the skew exceeds the configured max value |
| */ |
| private void checkClockSkew(final ServerName serverName, final long serverCurrentTime) |
| throws ClockOutOfSyncException { |
| long skew = Math.abs(EnvironmentEdgeManager.currentTime() - serverCurrentTime); |
| if (skew > maxSkew) { |
| String message = "Server " + serverName + " has been " + |
| "rejected; Reported time is too far out of sync with master. " + |
| "Time difference of " + skew + "ms > max allowed of " + maxSkew + "ms"; |
| LOG.warn(message); |
| throw new ClockOutOfSyncException(message); |
| } else if (skew > warningSkew){ |
| String message = "Reported time for server " + serverName + " is out of sync with master " + |
| "by " + skew + "ms. (Warning threshold is " + warningSkew + "ms; " + |
| "error threshold is " + maxSkew + "ms)"; |
| LOG.warn(message); |
| } |
| } |
| |
| /** |
| * Called when RegionServer first reports in for duty and thereafter each |
| * time it heartbeats to make sure it is has not been figured for dead. |
| * If this server is on the dead list, reject it with a YouAreDeadException. |
| * If it was dead but came back with a new start code, remove the old entry |
| * from the dead list. |
| * @param what START or REPORT |
| */ |
| private void checkIsDead(final ServerName serverName, final String what) |
| throws YouAreDeadException { |
| if (this.deadservers.isDeadServer(serverName)) { |
| // Exact match: host name, port and start code all match with existing one of the |
| // dead servers. So, this server must be dead. Tell it to kill itself. |
| String message = "Server " + what + " rejected; currently processing " + |
| serverName + " as dead server"; |
| LOG.debug(message); |
| throw new YouAreDeadException(message); |
| } |
| // Remove dead server with same hostname and port of newly checking in rs after master |
| // initialization. See HBASE-5916 for more information. |
| if ((this.master == null || this.master.isInitialized()) && |
| this.deadservers.cleanPreviousInstance(serverName)) { |
| // This server has now become alive after we marked it as dead. |
| // We removed it's previous entry from the dead list to reflect it. |
| LOG.debug("{} {} came back up, removed it from the dead servers list", what, serverName); |
| } |
| } |
| |
| /** |
| * Assumes onlineServers is locked. |
| * @return ServerName with matching hostname and port. |
| */ |
| private ServerName findServerWithSameHostnamePortWithLock( |
| final ServerName serverName) { |
| ServerName end = ServerName.valueOf(serverName.getHostname(), serverName.getPort(), |
| Long.MAX_VALUE); |
| |
| ServerName r = onlineServers.lowerKey(end); |
| if (r != null) { |
| if (ServerName.isSameAddress(r, serverName)) { |
| return r; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Adds the onlineServers list. onlineServers should be locked. |
| * @param serverName The remote servers name. |
| */ |
| void recordNewServerWithLock(final ServerName serverName, final ServerMetrics sl) { |
| LOG.info("Registering regionserver=" + serverName); |
| this.onlineServers.put(serverName, sl); |
| } |
| |
| public ConcurrentNavigableMap<byte[], Long> getFlushedSequenceIdByRegion() { |
| return flushedSequenceIdByRegion; |
| } |
| |
| public RegionStoreSequenceIds getLastFlushedSequenceId(byte[] encodedRegionName) { |
| RegionStoreSequenceIds.Builder builder = RegionStoreSequenceIds.newBuilder(); |
| Long seqId = flushedSequenceIdByRegion.get(encodedRegionName); |
| builder.setLastFlushedSequenceId(seqId != null ? seqId.longValue() : HConstants.NO_SEQNUM); |
| Map<byte[], Long> storeFlushedSequenceId = |
| storeFlushedSequenceIdsByRegion.get(encodedRegionName); |
| if (storeFlushedSequenceId != null) { |
| for (Map.Entry<byte[], Long> entry : storeFlushedSequenceId.entrySet()) { |
| builder.addStoreSequenceId(StoreSequenceId.newBuilder() |
| .setFamilyName(UnsafeByteOperations.unsafeWrap(entry.getKey())) |
| .setSequenceId(entry.getValue().longValue()).build()); |
| } |
| } |
| return builder.build(); |
| } |
| |
| /** |
| * @param serverName |
| * @return ServerMetrics if serverName is known else null |
| */ |
| public ServerMetrics getLoad(final ServerName serverName) { |
| return this.onlineServers.get(serverName); |
| } |
| |
| /** |
| * Compute the average load across all region servers. |
| * Currently, this uses a very naive computation - just uses the number of |
| * regions being served, ignoring stats about number of requests. |
| * @return the average load |
| */ |
| public double getAverageLoad() { |
| int totalLoad = 0; |
| int numServers = 0; |
| for (ServerMetrics sl : this.onlineServers.values()) { |
| numServers++; |
| totalLoad += sl.getRegionMetrics().size(); |
| } |
| return numServers == 0 ? 0 : |
| (double)totalLoad / (double)numServers; |
| } |
| |
| /** @return the count of active regionservers */ |
| public int countOfRegionServers() { |
| // Presumes onlineServers is a concurrent map |
| return this.onlineServers.size(); |
| } |
| |
| /** |
| * @return Read-only map of servers to serverinfo |
| */ |
| public Map<ServerName, ServerMetrics> getOnlineServers() { |
| // Presumption is that iterating the returned Map is OK. |
| synchronized (this.onlineServers) { |
| return Collections.unmodifiableMap(this.onlineServers); |
| } |
| } |
| |
| public DeadServer getDeadServers() { |
| return this.deadservers; |
| } |
| |
| /** |
| * Checks if any dead servers are currently in progress. |
| * @return true if any RS are being processed as dead, false if not |
| */ |
| public boolean areDeadServersInProgress() throws IOException { |
| return master.getProcedures().stream().anyMatch(p -> p instanceof ServerCrashProcedure); |
| } |
| |
| void letRegionServersShutdown() { |
| long previousLogTime = 0; |
| ServerName sn = master.getServerName(); |
| ZKWatcher zkw = master.getZooKeeper(); |
| int onlineServersCt; |
| while ((onlineServersCt = onlineServers.size()) > 0){ |
| |
| if (System.currentTimeMillis() > (previousLogTime + 1000)) { |
| Set<ServerName> remainingServers = onlineServers.keySet(); |
| synchronized (onlineServers) { |
| if (remainingServers.size() == 1 && remainingServers.contains(sn)) { |
| // Master will delete itself later. |
| return; |
| } |
| } |
| StringBuilder sb = new StringBuilder(); |
| // It's ok here to not sync on onlineServers - merely logging |
| for (ServerName key : remainingServers) { |
| if (sb.length() > 0) { |
| sb.append(", "); |
| } |
| sb.append(key); |
| } |
| LOG.info("Waiting on regionserver(s) " + sb.toString()); |
| previousLogTime = System.currentTimeMillis(); |
| } |
| |
| try { |
| List<String> servers = getRegionServersInZK(zkw); |
| if (servers == null || servers.isEmpty() || (servers.size() == 1 |
| && servers.contains(sn.toString()))) { |
| LOG.info("ZK shows there is only the master self online, exiting now"); |
| // Master could have lost some ZK events, no need to wait more. |
| break; |
| } |
| } catch (KeeperException ke) { |
| LOG.warn("Failed to list regionservers", ke); |
| // ZK is malfunctioning, don't hang here |
| break; |
| } |
| synchronized (onlineServers) { |
| try { |
| if (onlineServersCt == onlineServers.size()) onlineServers.wait(100); |
| } catch (InterruptedException ignored) { |
| // continue |
| } |
| } |
| } |
| } |
| |
| private List<String> getRegionServersInZK(final ZKWatcher zkw) |
| throws KeeperException { |
| return ZKUtil.listChildrenNoWatch(zkw, zkw.getZNodePaths().rsZNode); |
| } |
| |
| /** |
| * Expire the passed server. Add it to list of dead servers and queue a shutdown processing. |
| * @return pid if we queued a ServerCrashProcedure else {@link Procedure#NO_PROC_ID} if we did |
| * not (could happen for many reasons including the fact that its this server that is |
| * going down or we already have queued an SCP for this server or SCP processing is |
| * currently disabled because we are in startup phase). |
| */ |
| // Redo test so we can make this protected. |
| public synchronized long expireServer(final ServerName serverName) { |
| return expireServer(serverName, false); |
| |
| } |
| |
| synchronized long expireServer(final ServerName serverName, boolean force) { |
| // THIS server is going down... can't handle our own expiration. |
| if (serverName.equals(master.getServerName())) { |
| if (!(master.isAborted() || master.isStopped())) { |
| master.stop("We lost our znode?"); |
| } |
| return Procedure.NO_PROC_ID; |
| } |
| if (this.deadservers.isDeadServer(serverName)) { |
| LOG.warn("Expiration called on {} but already in DeadServer", serverName); |
| return Procedure.NO_PROC_ID; |
| } |
| moveFromOnlineToDeadServers(serverName); |
| |
| // If server is in draining mode, remove corresponding znode |
| // In some tests, the mocked HM may not have ZK Instance, hence null check |
| if (master.getZooKeeper() != null) { |
| String drainingZnode = ZNodePaths |
| .joinZNode(master.getZooKeeper().getZNodePaths().drainingZNode, serverName.getServerName()); |
| try { |
| ZKUtil.deleteNodeFailSilent(master.getZooKeeper(), drainingZnode); |
| } catch (KeeperException e) { |
| LOG.warn("Error deleting the draining znode for stopping server " + serverName.getServerName(), e); |
| } |
| } |
| |
| // If cluster is going down, yes, servers are going to be expiring; don't |
| // process as a dead server |
| if (isClusterShutdown()) { |
| LOG.info("Cluster shutdown set; " + serverName + |
| " expired; onlineServers=" + this.onlineServers.size()); |
| if (this.onlineServers.isEmpty()) { |
| master.stop("Cluster shutdown set; onlineServer=0"); |
| } |
| return Procedure.NO_PROC_ID; |
| } |
| LOG.info("Processing expiration of " + serverName + " on " + this.master.getServerName()); |
| long pid = master.getAssignmentManager().submitServerCrash(serverName, true, force); |
| // Tell our listeners that a server was removed |
| if (!this.listeners.isEmpty()) { |
| this.listeners.stream().forEach(l -> l.serverRemoved(serverName)); |
| } |
| // trigger a persist of flushedSeqId |
| if (flushedSeqIdFlusher != null) { |
| flushedSeqIdFlusher.triggerNow(); |
| } |
| return pid; |
| } |
| |
| /** |
| * Called when server has expired. |
| */ |
| // Locking in this class needs cleanup. |
| public synchronized void moveFromOnlineToDeadServers(final ServerName sn) { |
| synchronized (this.onlineServers) { |
| boolean online = this.onlineServers.containsKey(sn); |
| if (online) { |
| // Remove the server from the known servers lists and update load info BUT |
| // add to deadservers first; do this so it'll show in dead servers list if |
| // not in online servers list. |
| this.deadservers.putIfAbsent(sn); |
| this.onlineServers.remove(sn); |
| onlineServers.notifyAll(); |
| } else { |
| // If not online, that is odd but may happen if 'Unknown Servers' -- where meta |
| // has references to servers not online nor in dead servers list. If |
| // 'Unknown Server', don't add to DeadServers else will be there for ever. |
| LOG.trace("Expiration of {} but server not online", sn); |
| } |
| } |
| } |
| |
| /* |
| * Remove the server from the drain list. |
| */ |
| public synchronized boolean removeServerFromDrainList(final ServerName sn) { |
| // Warn if the server (sn) is not online. ServerName is of the form: |
| // <hostname> , <port> , <startcode> |
| |
| if (!this.isServerOnline(sn)) { |
| LOG.warn("Server " + sn + " is not currently online. " + |
| "Removing from draining list anyway, as requested."); |
| } |
| // Remove the server from the draining servers lists. |
| return this.drainingServers.remove(sn); |
| } |
| |
| /** |
| * Add the server to the drain list. |
| * @param sn |
| * @return True if the server is added or the server is already on the drain list. |
| */ |
| public synchronized boolean addServerToDrainList(final ServerName sn) { |
| // Warn if the server (sn) is not online. ServerName is of the form: |
| // <hostname> , <port> , <startcode> |
| |
| if (!this.isServerOnline(sn)) { |
| LOG.warn("Server " + sn + " is not currently online. " + |
| "Ignoring request to add it to draining list."); |
| return false; |
| } |
| // Add the server to the draining servers lists, if it's not already in |
| // it. |
| if (this.drainingServers.contains(sn)) { |
| LOG.warn("Server " + sn + " is already in the draining server list." + |
| "Ignoring request to add it again."); |
| return true; |
| } |
| LOG.info("Server " + sn + " added to draining server list."); |
| return this.drainingServers.add(sn); |
| } |
| |
| /** |
| * Contacts a region server and waits up to timeout ms |
| * to close the region. This bypasses the active hmaster. |
| * Pass -1 as timeout if you do not want to wait on result. |
| */ |
| public static void closeRegionSilentlyAndWait(AsyncClusterConnection connection, |
| ServerName server, RegionInfo region, long timeout) throws IOException, InterruptedException { |
| AsyncRegionServerAdmin admin = connection.getRegionServerAdmin(server); |
| try { |
| FutureUtils.get( |
| admin.closeRegion(ProtobufUtil.buildCloseRegionRequest(server, region.getRegionName()))); |
| } catch (IOException e) { |
| LOG.warn("Exception when closing region: " + region.getRegionNameAsString(), e); |
| } |
| if (timeout < 0) { |
| return; |
| } |
| long expiration = timeout + System.currentTimeMillis(); |
| while (System.currentTimeMillis() < expiration) { |
| try { |
| RegionInfo rsRegion = ProtobufUtil.toRegionInfo(FutureUtils |
| .get( |
| admin.getRegionInfo(RequestConverter.buildGetRegionInfoRequest(region.getRegionName()))) |
| .getRegionInfo()); |
| if (rsRegion == null) { |
| return; |
| } |
| } catch (IOException ioe) { |
| if (ioe instanceof NotServingRegionException || |
| (ioe instanceof RemoteWithExtrasException && |
| ((RemoteWithExtrasException)ioe).unwrapRemoteException() |
| instanceof NotServingRegionException)) { |
| // no need to retry again |
| return; |
| } |
| LOG.warn("Exception when retrieving regioninfo from: " + region.getRegionNameAsString(), |
| ioe); |
| } |
| Thread.sleep(1000); |
| } |
| throw new IOException("Region " + region + " failed to close within" + " timeout " + timeout); |
| } |
| |
| /** |
| * Calculate min necessary to start. This is not an absolute. It is just |
| * a friction that will cause us hang around a bit longer waiting on |
| * RegionServers to check-in. |
| */ |
| private int getMinToStart() { |
| if (master.isInMaintenanceMode()) { |
| // If in maintenance mode, then master hosting meta will be the only server available |
| return 1; |
| } |
| |
| int minimumRequired = 1; |
| if (LoadBalancer.isTablesOnMaster(master.getConfiguration()) && |
| LoadBalancer.isSystemTablesOnlyOnMaster(master.getConfiguration())) { |
| // If Master is carrying regions it will show up as a 'server', but is not handling user- |
| // space regions, so we need a second server. |
| minimumRequired = 2; |
| } |
| |
| int minToStart = this.master.getConfiguration().getInt(WAIT_ON_REGIONSERVERS_MINTOSTART, -1); |
| // Ensure we are never less than minimumRequired else stuff won't work. |
| return Math.max(minToStart, minimumRequired); |
| } |
| |
| /** |
| * Wait for the region servers to report in. |
| * We will wait until one of this condition is met: |
| * - the master is stopped |
| * - the 'hbase.master.wait.on.regionservers.maxtostart' number of |
| * region servers is reached |
| * - the 'hbase.master.wait.on.regionservers.mintostart' is reached AND |
| * there have been no new region server in for |
| * 'hbase.master.wait.on.regionservers.interval' time AND |
| * the 'hbase.master.wait.on.regionservers.timeout' is reached |
| * |
| * @throws InterruptedException |
| */ |
| public void waitForRegionServers(MonitoredTask status) throws InterruptedException { |
| final long interval = this.master.getConfiguration(). |
| getLong(WAIT_ON_REGIONSERVERS_INTERVAL, 1500); |
| final long timeout = this.master.getConfiguration(). |
| getLong(WAIT_ON_REGIONSERVERS_TIMEOUT, 4500); |
| // Min is not an absolute; just a friction making us wait longer on server checkin. |
| int minToStart = getMinToStart(); |
| int maxToStart = this.master.getConfiguration(). |
| getInt(WAIT_ON_REGIONSERVERS_MAXTOSTART, Integer.MAX_VALUE); |
| if (maxToStart < minToStart) { |
| LOG.warn(String.format("The value of '%s' (%d) is set less than '%s' (%d), ignoring.", |
| WAIT_ON_REGIONSERVERS_MAXTOSTART, maxToStart, |
| WAIT_ON_REGIONSERVERS_MINTOSTART, minToStart)); |
| maxToStart = Integer.MAX_VALUE; |
| } |
| |
| long now = System.currentTimeMillis(); |
| final long startTime = now; |
| long slept = 0; |
| long lastLogTime = 0; |
| long lastCountChange = startTime; |
| int count = countOfRegionServers(); |
| int oldCount = 0; |
| // This while test is a little hard to read. We try to comment it in below but in essence: |
| // Wait if Master is not stopped and the number of regionservers that have checked-in is |
| // less than the maxToStart. Both of these conditions will be true near universally. |
| // Next, we will keep cycling if ANY of the following three conditions are true: |
| // 1. The time since a regionserver registered is < interval (means servers are actively checking in). |
| // 2. We are under the total timeout. |
| // 3. The count of servers is < minimum. |
| for (ServerListener listener: this.listeners) { |
| listener.waiting(); |
| } |
| while (!this.master.isStopped() && !isClusterShutdown() && count < maxToStart && |
| ((lastCountChange + interval) > now || timeout > slept || count < minToStart)) { |
| // Log some info at every interval time or if there is a change |
| if (oldCount != count || lastLogTime + interval < now) { |
| lastLogTime = now; |
| String msg = |
| "Waiting on regionserver count=" + count + "; waited="+ |
| slept + "ms, expecting min=" + minToStart + " server(s), max="+ getStrForMax(maxToStart) + |
| " server(s), " + "timeout=" + timeout + "ms, lastChange=" + (lastCountChange - now) + "ms"; |
| LOG.info(msg); |
| status.setStatus(msg); |
| } |
| |
| // We sleep for some time |
| final long sleepTime = 50; |
| Thread.sleep(sleepTime); |
| now = System.currentTimeMillis(); |
| slept = now - startTime; |
| |
| oldCount = count; |
| count = countOfRegionServers(); |
| if (count != oldCount) { |
| lastCountChange = now; |
| } |
| } |
| // Did we exit the loop because cluster is going down? |
| if (isClusterShutdown()) { |
| this.master.stop("Cluster shutdown"); |
| } |
| LOG.info("Finished waiting on RegionServer count=" + count + "; waited=" + slept + "ms," + |
| " expected min=" + minToStart + " server(s), max=" + getStrForMax(maxToStart) + " server(s),"+ |
| " master is "+ (this.master.isStopped() ? "stopped.": "running")); |
| } |
| |
| private String getStrForMax(final int max) { |
| return max == Integer.MAX_VALUE? "NO_LIMIT": Integer.toString(max); |
| } |
| |
| /** |
| * @return A copy of the internal list of online servers. |
| */ |
| public List<ServerName> getOnlineServersList() { |
| // TODO: optimize the load balancer call so we don't need to make a new list |
| // TODO: FIX. THIS IS POPULAR CALL. |
| return new ArrayList<>(this.onlineServers.keySet()); |
| } |
| |
| /** |
| * @param keys The target server name |
| * @param idleServerPredicator Evaluates the server on the given load |
| * @return A copy of the internal list of online servers matched by the predicator |
| */ |
| public List<ServerName> getOnlineServersListWithPredicator(List<ServerName> keys, |
| Predicate<ServerMetrics> idleServerPredicator) { |
| List<ServerName> names = new ArrayList<>(); |
| if (keys != null && idleServerPredicator != null) { |
| keys.forEach(name -> { |
| ServerMetrics load = onlineServers.get(name); |
| if (load != null) { |
| if (idleServerPredicator.test(load)) { |
| names.add(name); |
| } |
| } |
| }); |
| } |
| return names; |
| } |
| |
| /** |
| * @return A copy of the internal list of draining servers. |
| */ |
| public List<ServerName> getDrainingServersList() { |
| return new ArrayList<>(this.drainingServers); |
| } |
| |
| public boolean isServerOnline(ServerName serverName) { |
| return serverName != null && onlineServers.containsKey(serverName); |
| } |
| |
| public enum ServerLiveState { |
| LIVE, |
| DEAD, |
| UNKNOWN |
| } |
| |
| /** |
| * @return whether the server is online, dead, or unknown. |
| */ |
| public synchronized ServerLiveState isServerKnownAndOnline(ServerName serverName) { |
| return onlineServers.containsKey(serverName) ? ServerLiveState.LIVE |
| : (deadservers.isDeadServer(serverName) ? ServerLiveState.DEAD : ServerLiveState.UNKNOWN); |
| } |
| |
| /** |
| * Check if a server is known to be dead. A server can be online, |
| * or known to be dead, or unknown to this manager (i.e, not online, |
| * not known to be dead either; it is simply not tracked by the |
| * master any more, for example, a very old previous instance). |
| */ |
| public synchronized boolean isServerDead(ServerName serverName) { |
| return serverName == null || deadservers.isDeadServer(serverName); |
| } |
| |
| public void shutdownCluster() { |
| String statusStr = "Cluster shutdown requested of master=" + this.master.getServerName(); |
| LOG.info(statusStr); |
| this.clusterShutdown.set(true); |
| if (onlineServers.isEmpty()) { |
| // we do not synchronize here so this may cause a double stop, but not a big deal |
| master.stop("OnlineServer=0 right after cluster shutdown set"); |
| } |
| } |
| |
| public boolean isClusterShutdown() { |
| return this.clusterShutdown.get(); |
| } |
| |
| /** |
| * start chore in ServerManager |
| */ |
| public void startChore() { |
| Configuration c = master.getConfiguration(); |
| if (persistFlushedSequenceId) { |
| // when reach here, RegionStates should loaded, firstly, we call remove deleted regions |
| removeDeletedRegionFromLoadedFlushedSequenceIds(); |
| int flushPeriod = c.getInt(FLUSHEDSEQUENCEID_FLUSHER_INTERVAL, |
| FLUSHEDSEQUENCEID_FLUSHER_INTERVAL_DEFAULT); |
| flushedSeqIdFlusher = new FlushedSequenceIdFlusher( |
| "FlushedSequenceIdFlusher", flushPeriod); |
| master.getChoreService().scheduleChore(flushedSeqIdFlusher); |
| } |
| } |
| |
| /** |
| * Stop the ServerManager. |
| */ |
| public void stop() { |
| if (flushedSeqIdFlusher != null) { |
| flushedSeqIdFlusher.cancel(); |
| } |
| if (persistFlushedSequenceId) { |
| try { |
| persistRegionLastFlushedSequenceIds(); |
| } catch (IOException e) { |
| LOG.warn("Failed to persist last flushed sequence id of regions" |
| + " to file system", e); |
| } |
| } |
| } |
| |
| /** |
| * Creates a list of possible destinations for a region. It contains the online servers, but not |
| * the draining or dying servers. |
| * @param serversToExclude can be null if there is no server to exclude |
| */ |
| public List<ServerName> createDestinationServersList(final List<ServerName> serversToExclude){ |
| final List<ServerName> destServers = getOnlineServersList(); |
| |
| if (serversToExclude != null) { |
| destServers.removeAll(serversToExclude); |
| } |
| |
| // Loop through the draining server list and remove them from the server list |
| final List<ServerName> drainingServersCopy = getDrainingServersList(); |
| destServers.removeAll(drainingServersCopy); |
| |
| return destServers; |
| } |
| |
| /** |
| * Calls {@link #createDestinationServersList} without server to exclude. |
| */ |
| public List<ServerName> createDestinationServersList(){ |
| return createDestinationServersList(null); |
| } |
| |
| /** |
| * To clear any dead server with same host name and port of any online server |
| */ |
| void clearDeadServersWithSameHostNameAndPortOfOnlineServer() { |
| for (ServerName serverName : getOnlineServersList()) { |
| deadservers.cleanAllPreviousInstances(serverName); |
| } |
| } |
| |
| /** |
| * Called by delete table and similar to notify the ServerManager that a region was removed. |
| */ |
| public void removeRegion(final RegionInfo regionInfo) { |
| final byte[] encodedName = regionInfo.getEncodedNameAsBytes(); |
| storeFlushedSequenceIdsByRegion.remove(encodedName); |
| flushedSequenceIdByRegion.remove(encodedName); |
| } |
| |
| public boolean isRegionInServerManagerStates(final RegionInfo hri) { |
| final byte[] encodedName = hri.getEncodedNameAsBytes(); |
| return (storeFlushedSequenceIdsByRegion.containsKey(encodedName) |
| || flushedSequenceIdByRegion.containsKey(encodedName)); |
| } |
| |
| /** |
| * Called by delete table and similar to notify the ServerManager that a region was removed. |
| */ |
| public void removeRegions(final List<RegionInfo> regions) { |
| for (RegionInfo hri: regions) { |
| removeRegion(hri); |
| } |
| } |
| |
| /** |
| * May return 0 when server is not online. |
| */ |
| public int getVersionNumber(ServerName serverName) { |
| ServerMetrics serverMetrics = onlineServers.get(serverName); |
| return serverMetrics != null ? serverMetrics.getVersionNumber() : 0; |
| } |
| |
| /** |
| * May return "0.0.0" when server is not online |
| */ |
| public String getVersion(ServerName serverName) { |
| ServerMetrics serverMetrics = onlineServers.get(serverName); |
| return serverMetrics != null ? serverMetrics.getVersion() : "0.0.0"; |
| } |
| |
| public int getInfoPort(ServerName serverName) { |
| ServerMetrics serverMetrics = onlineServers.get(serverName); |
| return serverMetrics != null ? serverMetrics.getInfoServerPort() : 0; |
| } |
| |
| /** |
| * Persist last flushed sequence id of each region to HDFS |
| * @throws IOException if persit to HDFS fails |
| */ |
| private void persistRegionLastFlushedSequenceIds() throws IOException { |
| if (isFlushSeqIdPersistInProgress) { |
| return; |
| } |
| isFlushSeqIdPersistInProgress = true; |
| try { |
| Configuration conf = master.getConfiguration(); |
| Path rootDir = CommonFSUtils.getRootDir(conf); |
| Path lastFlushedSeqIdPath = new Path(rootDir, LAST_FLUSHED_SEQ_ID_FILE); |
| FileSystem fs = FileSystem.get(conf); |
| if (fs.exists(lastFlushedSeqIdPath)) { |
| LOG.info("Rewriting .lastflushedseqids file at: " |
| + lastFlushedSeqIdPath); |
| if (!fs.delete(lastFlushedSeqIdPath, false)) { |
| throw new IOException("Unable to remove existing " |
| + lastFlushedSeqIdPath); |
| } |
| } else { |
| LOG.info("Writing .lastflushedseqids file at: " + lastFlushedSeqIdPath); |
| } |
| FSDataOutputStream out = fs.create(lastFlushedSeqIdPath); |
| FlushedSequenceId.Builder flushedSequenceIdBuilder = |
| FlushedSequenceId.newBuilder(); |
| try { |
| for (Entry<byte[], Long> entry : flushedSequenceIdByRegion.entrySet()) { |
| FlushedRegionSequenceId.Builder flushedRegionSequenceIdBuilder = |
| FlushedRegionSequenceId.newBuilder(); |
| flushedRegionSequenceIdBuilder.setRegionEncodedName( |
| ByteString.copyFrom(entry.getKey())); |
| flushedRegionSequenceIdBuilder.setSeqId(entry.getValue()); |
| ConcurrentNavigableMap<byte[], Long> storeSeqIds = |
| storeFlushedSequenceIdsByRegion.get(entry.getKey()); |
| if (storeSeqIds != null) { |
| for (Entry<byte[], Long> store : storeSeqIds.entrySet()) { |
| FlushedStoreSequenceId.Builder flushedStoreSequenceIdBuilder = |
| FlushedStoreSequenceId.newBuilder(); |
| flushedStoreSequenceIdBuilder.setFamily(ByteString.copyFrom(store.getKey())); |
| flushedStoreSequenceIdBuilder.setSeqId(store.getValue()); |
| flushedRegionSequenceIdBuilder.addStores(flushedStoreSequenceIdBuilder); |
| } |
| } |
| flushedSequenceIdBuilder.addRegionSequenceId(flushedRegionSequenceIdBuilder); |
| } |
| flushedSequenceIdBuilder.build().writeDelimitedTo(out); |
| } finally { |
| if (out != null) { |
| out.close(); |
| } |
| } |
| } finally { |
| isFlushSeqIdPersistInProgress = false; |
| } |
| } |
| |
| /** |
| * Load last flushed sequence id of each region from HDFS, if persisted |
| */ |
| public void loadLastFlushedSequenceIds() throws IOException { |
| if (!persistFlushedSequenceId) { |
| return; |
| } |
| Configuration conf = master.getConfiguration(); |
| Path rootDir = CommonFSUtils.getRootDir(conf); |
| Path lastFlushedSeqIdPath = new Path(rootDir, LAST_FLUSHED_SEQ_ID_FILE); |
| FileSystem fs = FileSystem.get(conf); |
| if (!fs.exists(lastFlushedSeqIdPath)) { |
| LOG.info("No .lastflushedseqids found at" + lastFlushedSeqIdPath |
| + " will record last flushed sequence id" |
| + " for regions by regionserver report all over again"); |
| return; |
| } else { |
| LOG.info("begin to load .lastflushedseqids at " + lastFlushedSeqIdPath); |
| } |
| FSDataInputStream in = fs.open(lastFlushedSeqIdPath); |
| try { |
| FlushedSequenceId flushedSequenceId = |
| FlushedSequenceId.parseDelimitedFrom(in); |
| if (flushedSequenceId == null) { |
| LOG.info(".lastflushedseqids found at {} is empty", lastFlushedSeqIdPath); |
| return; |
| } |
| for (FlushedRegionSequenceId flushedRegionSequenceId : flushedSequenceId |
| .getRegionSequenceIdList()) { |
| byte[] encodedRegionName = flushedRegionSequenceId |
| .getRegionEncodedName().toByteArray(); |
| flushedSequenceIdByRegion |
| .putIfAbsent(encodedRegionName, flushedRegionSequenceId.getSeqId()); |
| if (flushedRegionSequenceId.getStoresList() != null |
| && flushedRegionSequenceId.getStoresList().size() != 0) { |
| ConcurrentNavigableMap<byte[], Long> storeFlushedSequenceId = |
| computeIfAbsent(storeFlushedSequenceIdsByRegion, encodedRegionName, |
| () -> new ConcurrentSkipListMap<>(Bytes.BYTES_COMPARATOR)); |
| for (FlushedStoreSequenceId flushedStoreSequenceId : flushedRegionSequenceId |
| .getStoresList()) { |
| storeFlushedSequenceId |
| .put(flushedStoreSequenceId.getFamily().toByteArray(), |
| flushedStoreSequenceId.getSeqId()); |
| } |
| } |
| } |
| } finally { |
| in.close(); |
| } |
| } |
| |
| /** |
| * Regions may have been removed between latest persist of FlushedSequenceIds |
| * and master abort. So after loading FlushedSequenceIds from file, and after |
| * meta loaded, we need to remove the deleted region according to RegionStates. |
| */ |
| public void removeDeletedRegionFromLoadedFlushedSequenceIds() { |
| RegionStates regionStates = master.getAssignmentManager().getRegionStates(); |
| Iterator<byte[]> it = flushedSequenceIdByRegion.keySet().iterator(); |
| while(it.hasNext()) { |
| byte[] regionEncodedName = it.next(); |
| if (regionStates.getRegionState(Bytes.toStringBinary(regionEncodedName)) == null) { |
| it.remove(); |
| storeFlushedSequenceIdsByRegion.remove(regionEncodedName); |
| } |
| } |
| } |
| |
| private class FlushedSequenceIdFlusher extends ScheduledChore { |
| |
| public FlushedSequenceIdFlusher(String name, int p) { |
| super(name, master, p, 60 * 1000); //delay one minute before first execute |
| } |
| |
| @Override |
| protected void chore() { |
| try { |
| persistRegionLastFlushedSequenceIds(); |
| } catch (IOException e) { |
| LOG.debug("Failed to persist last flushed sequence id of regions" |
| + " to file system", e); |
| } |
| } |
| } |
| } |
