Examples with FavoredNodesManager org.apache.hadoop.hbase.favored.FavoredNodesManager used on opensource projects

Example 1 with FavoredNodesManager

use of org.apache.hadoop.hbase.favored.FavoredNodesManager in project hbase by apache.

the class AssignmentManager method retrySendRegionOpen.

/**
   * At master failover, for pending_open region, make sure
   * sendRegionOpen RPC call is sent to the target regionserver
   */
private void retrySendRegionOpen(final RegionState regionState) {
    this.executorService.submit(new EventHandler(server, EventType.M_MASTER_RECOVERY) {

        @Override
        public void process() throws IOException {
            HRegionInfo hri = regionState.getRegion();
            ServerName serverName = regionState.getServerName();
            ReentrantLock lock = locker.acquireLock(hri.getEncodedName());
            try {
                for (int i = 1; i <= maximumAttempts; i++) {
                    if (!serverManager.isServerOnline(serverName) || server.isStopped() || server.isAborted()) {
                        // No need any more
                        return;
                    }
                    try {
                        if (!regionState.equals(regionStates.getRegionState(hri))) {
                            // Region is not in the expected state any more
                            return;
                        }
                        List<ServerName> favoredNodes = ServerName.EMPTY_SERVER_LIST;
                        if (shouldAssignFavoredNodes(hri)) {
                            FavoredNodesManager fnm = ((MasterServices) server).getFavoredNodesManager();
                            favoredNodes = fnm.getFavoredNodesWithDNPort(hri);
                        }
                        serverManager.sendRegionOpen(serverName, hri, favoredNodes);
                        // we're done
                        return;
                    } catch (Throwable t) {
                        if (t instanceof RemoteException) {
                            t = ((RemoteException) t).unwrapRemoteException();
                        }
                        if (t instanceof FailedServerException && i < maximumAttempts) {
                            // retry too soon. Retry after the failed_server_expiry time
                            try {
                                Configuration conf = this.server.getConfiguration();
                                long sleepTime = 1 + conf.getInt(RpcClient.FAILED_SERVER_EXPIRY_KEY, RpcClient.FAILED_SERVER_EXPIRY_DEFAULT);
                                if (LOG.isDebugEnabled()) {
                                    LOG.debug(serverName + " is on failed server list; waiting " + sleepTime + "ms", t);
                                }
                                Thread.sleep(sleepTime);
                                continue;
                            } catch (InterruptedException ie) {
                                LOG.warn("Failed to assign " + hri.getRegionNameAsString() + " since interrupted", ie);
                                regionStates.updateRegionState(hri, State.FAILED_OPEN);
                                Thread.currentThread().interrupt();
                                return;
                            }
                        }
                        if (serverManager.isServerOnline(serverName) && t instanceof java.net.SocketTimeoutException) {
                            // reset the try count
                            i--;
                        } else {
                            LOG.info("Got exception in retrying sendRegionOpen for " + regionState + "; try=" + i + " of " + maximumAttempts, t);
                        }
                        Threads.sleep(100);
                    }
                }
                // Run out of attempts
                regionStates.updateRegionState(hri, State.FAILED_OPEN);
            } finally {
                lock.unlock();
            }
        }
    });
}

Example 2 with FavoredNodesManager

use of org.apache.hadoop.hbase.favored.FavoredNodesManager in project hbase by apache.

the class CatalogJanitor method cleanMergeRegion.

/**
   * If merged region no longer holds reference to the merge regions, archive
   * merge region on hdfs and perform deleting references in hbase:meta
   * @param mergedRegion
   * @param regionA
   * @param regionB
   * @return true if we delete references in merged region on hbase:meta and archive
   *         the files on the file system
   * @throws IOException
   */
boolean cleanMergeRegion(final HRegionInfo mergedRegion, final HRegionInfo regionA, final HRegionInfo regionB) throws IOException {
    FileSystem fs = this.services.getMasterFileSystem().getFileSystem();
    Path rootdir = this.services.getMasterFileSystem().getRootDir();
    Path tabledir = FSUtils.getTableDir(rootdir, mergedRegion.getTable());
    HTableDescriptor htd = getTableDescriptor(mergedRegion.getTable());
    HRegionFileSystem regionFs = null;
    try {
        regionFs = HRegionFileSystem.openRegionFromFileSystem(this.services.getConfiguration(), fs, tabledir, mergedRegion, true);
    } catch (IOException e) {
        LOG.warn("Merged region does not exist: " + mergedRegion.getEncodedName());
    }
    if (regionFs == null || !regionFs.hasReferences(htd)) {
        LOG.debug("Deleting region " + regionA.getRegionNameAsString() + " and " + regionB.getRegionNameAsString() + " from fs because merged region no longer holds references");
        HFileArchiver.archiveRegion(this.services.getConfiguration(), fs, regionA);
        HFileArchiver.archiveRegion(this.services.getConfiguration(), fs, regionB);
        MetaTableAccessor.deleteMergeQualifiers(services.getConnection(), mergedRegion);
        services.getServerManager().removeRegion(regionA);
        services.getServerManager().removeRegion(regionB);
        FavoredNodesManager fnm = this.services.getFavoredNodesManager();
        if (fnm != null) {
            fnm.deleteFavoredNodesForRegions(Lists.newArrayList(regionA, regionB));
        }
        return true;
    }
    return false;
}

Example 3 with FavoredNodesManager

use of org.apache.hadoop.hbase.favored.FavoredNodesManager in project hbase by apache.

the class DeleteTableProcedure method deleteFromMeta.

protected static void deleteFromMeta(final MasterProcedureEnv env, final TableName tableName, List<HRegionInfo> regions) throws IOException {
    MetaTableAccessor.deleteRegions(env.getMasterServices().getConnection(), regions);
    // Clean any remaining rows for this table.
    cleanAnyRemainingRows(env, tableName);
    // clean region references from the server manager
    env.getMasterServices().getServerManager().removeRegions(regions);
    // Clear Favored Nodes for this table
    FavoredNodesManager fnm = env.getMasterServices().getFavoredNodesManager();
    if (fnm != null) {
        fnm.deleteFavoredNodesForRegions(regions);
    }
}

Example 4 with FavoredNodesManager

use of org.apache.hadoop.hbase.favored.FavoredNodesManager in project hbase by apache.

the class HMaster method finishActiveMasterInitialization.

/**
 * Finish initialization of HMaster after becoming the primary master.
 * <p/>
 * The startup order is a bit complicated but very important, do not change it unless you know
 * what you are doing.
 * <ol>
 * <li>Initialize file system based components - file system manager, wal manager, table
 * descriptors, etc</li>
 * <li>Publish cluster id</li>
 * <li>Here comes the most complicated part - initialize server manager, assignment manager and
 * region server tracker
 * <ol type='i'>
 * <li>Create server manager</li>
 * <li>Create master local region</li>
 * <li>Create procedure executor, load the procedures, but do not start workers. We will start it
 * later after we finish scheduling SCPs to avoid scheduling duplicated SCPs for the same
 * server</li>
 * <li>Create assignment manager and start it, load the meta region state, but do not load data
 * from meta region</li>
 * <li>Start region server tracker, construct the online servers set and find out dead servers and
 * schedule SCP for them. The online servers will be constructed by scanning zk, and we will also
 * scan the wal directory to find out possible live region servers, and the differences between
 * these two sets are the dead servers</li>
 * </ol>
 * </li>
 * <li>If this is a new deploy, schedule a InitMetaProcedure to initialize meta</li>
 * <li>Start necessary service threads - balancer, catalog janitor, executor services, and also
 * the procedure executor, etc. Notice that the balancer must be created first as assignment
 * manager may use it when assigning regions.</li>
 * <li>Wait for meta to be initialized if necessary, start table state manager.</li>
 * <li>Wait for enough region servers to check-in</li>
 * <li>Let assignment manager load data from meta and construct region states</li>
 * <li>Start all other things such as chore services, etc</li>
 * </ol>
 * <p/>
 * Notice that now we will not schedule a special procedure to make meta online(unless the first
 * time where meta has not been created yet), we will rely on SCP to bring meta online.
 */
private void finishActiveMasterInitialization(MonitoredTask status) throws IOException, InterruptedException, KeeperException, ReplicationException {
    /*
     * We are active master now... go initialize components we need to run.
     */
    status.setStatus("Initializing Master file system");
    this.masterActiveTime = EnvironmentEdgeManager.currentTime();
    // TODO: Do this using Dependency Injection, using PicoContainer, Guice or Spring.
    // always initialize the MemStoreLAB as we use a region to store data in master now, see
    // localStore.
    initializeMemStoreChunkCreator(null);
    this.fileSystemManager = new MasterFileSystem(conf);
    this.walManager = new MasterWalManager(this);
    // warm-up HTDs cache on master initialization
    if (preLoadTableDescriptors) {
        status.setStatus("Pre-loading table descriptors");
        this.tableDescriptors.getAll();
    }
    // Publish cluster ID; set it in Master too. The superclass RegionServer does this later but
    // only after it has checked in with the Master. At least a few tests ask Master for clusterId
    // before it has called its run method and before RegionServer has done the reportForDuty.
    ClusterId clusterId = fileSystemManager.getClusterId();
    status.setStatus("Publishing Cluster ID " + clusterId + " in ZooKeeper");
    ZKClusterId.setClusterId(this.zooKeeper, fileSystemManager.getClusterId());
    this.clusterId = clusterId.toString();
    // hbase.write.hbck1.lock.file to false.
    if (this.conf.getBoolean("hbase.write.hbck1.lock.file", true)) {
        Pair<Path, FSDataOutputStream> result = null;
        try {
            result = HBaseFsck.checkAndMarkRunningHbck(this.conf, HBaseFsck.createLockRetryCounterFactory(this.conf).create());
        } finally {
            if (result != null) {
                Closeables.close(result.getSecond(), true);
            }
        }
    }
    status.setStatus("Initialize ServerManager and schedule SCP for crash servers");
    // The below two managers must be created before loading procedures, as they will be used during
    // loading.
    this.serverManager = createServerManager(this);
    this.syncReplicationReplayWALManager = new SyncReplicationReplayWALManager(this);
    if (!conf.getBoolean(HBASE_SPLIT_WAL_COORDINATED_BY_ZK, DEFAULT_HBASE_SPLIT_COORDINATED_BY_ZK)) {
        this.splitWALManager = new SplitWALManager(this);
    }
    // initialize master local region
    masterRegion = MasterRegionFactory.create(this);
    tryMigrateMetaLocationsFromZooKeeper();
    createProcedureExecutor();
    Map<Class<?>, List<Procedure<MasterProcedureEnv>>> procsByType = procedureExecutor.getActiveProceduresNoCopy().stream().collect(Collectors.groupingBy(p -> p.getClass()));
    // Create Assignment Manager
    this.assignmentManager = createAssignmentManager(this, masterRegion);
    this.assignmentManager.start();
    // TODO: TRSP can perform as the sub procedure for other procedures, so even if it is marked as
    // completed, it could still be in the procedure list. This is a bit strange but is another
    // story, need to verify the implementation for ProcedureExecutor and ProcedureStore.
    List<TransitRegionStateProcedure> ritList = procsByType.getOrDefault(TransitRegionStateProcedure.class, Collections.emptyList()).stream().filter(p -> !p.isFinished()).map(p -> (TransitRegionStateProcedure) p).collect(Collectors.toList());
    this.assignmentManager.setupRIT(ritList);
    // Start RegionServerTracker with listing of servers found with exiting SCPs -- these should
    // be registered in the deadServers set -- and with the list of servernames out on the
    // filesystem that COULD BE 'alive' (we'll schedule SCPs for each and let SCP figure it out).
    // We also pass dirs that are already 'splitting'... so we can do some checks down in tracker.
    // TODO: Generate the splitting and live Set in one pass instead of two as we currently do.
    this.regionServerTracker.upgrade(procsByType.getOrDefault(ServerCrashProcedure.class, Collections.emptyList()).stream().map(p -> (ServerCrashProcedure) p).map(p -> p.getServerName()).collect(Collectors.toSet()), walManager.getLiveServersFromWALDir(), walManager.getSplittingServersFromWALDir());
    // This manager must be accessed AFTER hbase:meta is confirmed on line..
    this.tableStateManager = new TableStateManager(this);
    status.setStatus("Initializing ZK system trackers");
    initializeZKBasedSystemTrackers();
    status.setStatus("Loading last flushed sequence id of regions");
    try {
        this.serverManager.loadLastFlushedSequenceIds();
    } catch (IOException e) {
        LOG.info("Failed to load last flushed sequence id of regions" + " from file system", e);
    }
    // Set ourselves as active Master now our claim has succeeded up in zk.
    this.activeMaster = true;
    // Start the Zombie master detector after setting master as active, see HBASE-21535
    Thread zombieDetector = new Thread(new MasterInitializationMonitor(this), "ActiveMasterInitializationMonitor-" + EnvironmentEdgeManager.currentTime());
    zombieDetector.setDaemon(true);
    zombieDetector.start();
    if (!maintenanceMode) {
        // default with quota support, avoiding if user specifically asks to not load this Observer.
        if (QuotaUtil.isQuotaEnabled(conf)) {
            updateConfigurationForQuotasObserver(conf);
        }
        // initialize master side coprocessors before we start handling requests
        status.setStatus("Initializing master coprocessors");
        this.cpHost = new MasterCoprocessorHost(this, this.conf);
    } else {
        // start an in process region server for carrying system regions
        maintenanceRegionServer = JVMClusterUtil.createRegionServerThread(getConfiguration(), HRegionServer.class, 0);
        maintenanceRegionServer.start();
    }
    // Checking if meta needs initializing.
    status.setStatus("Initializing meta table if this is a new deploy");
    InitMetaProcedure initMetaProc = null;
    // Print out state of hbase:meta on startup; helps debugging.
    if (!this.assignmentManager.getRegionStates().hasTableRegionStates(TableName.META_TABLE_NAME)) {
        Optional<InitMetaProcedure> optProc = procedureExecutor.getProcedures().stream().filter(p -> p instanceof InitMetaProcedure).map(o -> (InitMetaProcedure) o).findAny();
        initMetaProc = optProc.orElseGet(() -> {
            // schedule an init meta procedure if meta has not been deployed yet
            InitMetaProcedure temp = new InitMetaProcedure();
            procedureExecutor.submitProcedure(temp);
            return temp;
        });
    }
    // initialize load balancer
    this.balancer.setMasterServices(this);
    this.balancer.initialize();
    this.balancer.updateClusterMetrics(getClusterMetricsWithoutCoprocessor());
    // start up all service threads.
    status.setStatus("Initializing master service threads");
    startServiceThreads();
    // wait meta to be initialized after we start procedure executor
    if (initMetaProc != null) {
        initMetaProc.await();
    }
    // Wake up this server to check in
    sleeper.skipSleepCycle();
    // Wait for region servers to report in.
    // With this as part of master initialization, it precludes our being able to start a single
    // server that is both Master and RegionServer. Needs more thought. TODO.
    String statusStr = "Wait for region servers to report in";
    status.setStatus(statusStr);
    LOG.info(Objects.toString(status));
    waitForRegionServers(status);
    // Check if master is shutting down because issue initializing regionservers or balancer.
    if (isStopped()) {
        return;
    }
    status.setStatus("Starting assignment manager");
    // available. That's what waitForMetaOnline does.
    if (!waitForMetaOnline()) {
        return;
    }
    TableDescriptor metaDescriptor = tableDescriptors.get(TableName.META_TABLE_NAME);
    final ColumnFamilyDescriptor tableFamilyDesc = metaDescriptor.getColumnFamily(HConstants.TABLE_FAMILY);
    final ColumnFamilyDescriptor replBarrierFamilyDesc = metaDescriptor.getColumnFamily(HConstants.REPLICATION_BARRIER_FAMILY);
    this.assignmentManager.joinCluster();
    // The below depends on hbase:meta being online.
    this.assignmentManager.processOfflineRegions();
    // this must be called after the above processOfflineRegions to prevent race
    this.assignmentManager.wakeMetaLoadedEvent();
    // first.
    if (conf.get(HConstants.META_REPLICAS_NUM) != null) {
        int replicasNumInConf = conf.getInt(HConstants.META_REPLICAS_NUM, HConstants.DEFAULT_META_REPLICA_NUM);
        TableDescriptor metaDesc = tableDescriptors.get(TableName.META_TABLE_NAME);
        if (metaDesc.getRegionReplication() != replicasNumInConf) {
            // it is possible that we already have some replicas before upgrading, so we must set the
            // region replication number in meta TableDescriptor directly first, without creating a
            // ModifyTableProcedure, otherwise it may cause a double assign for the meta replicas.
            int existingReplicasCount = assignmentManager.getRegionStates().getRegionsOfTable(TableName.META_TABLE_NAME).size();
            if (existingReplicasCount > metaDesc.getRegionReplication()) {
                LOG.info("Update replica count of hbase:meta from {}(in TableDescriptor)" + " to {}(existing ZNodes)", metaDesc.getRegionReplication(), existingReplicasCount);
                metaDesc = TableDescriptorBuilder.newBuilder(metaDesc).setRegionReplication(existingReplicasCount).build();
                tableDescriptors.update(metaDesc);
            }
            // check again, and issue a ModifyTableProcedure if needed
            if (metaDesc.getRegionReplication() != replicasNumInConf) {
                LOG.info("The {} config is {} while the replica count in TableDescriptor is {}" + " for hbase:meta, altering...", HConstants.META_REPLICAS_NUM, replicasNumInConf, metaDesc.getRegionReplication());
                procedureExecutor.submitProcedure(new ModifyTableProcedure(procedureExecutor.getEnvironment(), TableDescriptorBuilder.newBuilder(metaDesc).setRegionReplication(replicasNumInConf).build(), null, metaDesc, false));
            }
        }
    }
    // Initialize after meta is up as below scans meta
    FavoredNodesManager fnm = getFavoredNodesManager();
    if (fnm != null) {
        fnm.initializeFromMeta();
    }
    // set cluster status again after user regions are assigned
    this.balancer.updateClusterMetrics(getClusterMetricsWithoutCoprocessor());
    // Start balancer and meta catalog janitor after meta and regions have been assigned.
    status.setStatus("Starting balancer and catalog janitor");
    this.clusterStatusChore = new ClusterStatusChore(this, balancer);
    getChoreService().scheduleChore(clusterStatusChore);
    this.balancerChore = new BalancerChore(this);
    if (!disableBalancerChoreForTest) {
        getChoreService().scheduleChore(balancerChore);
    }
    if (regionNormalizerManager != null) {
        getChoreService().scheduleChore(regionNormalizerManager.getRegionNormalizerChore());
    }
    this.catalogJanitorChore = new CatalogJanitor(this);
    getChoreService().scheduleChore(catalogJanitorChore);
    this.hbckChore = new HbckChore(this);
    getChoreService().scheduleChore(hbckChore);
    this.serverManager.startChore();
    // Only for rolling upgrade, where we need to migrate the data in namespace table to meta table.
    if (!waitForNamespaceOnline()) {
        return;
    }
    status.setStatus("Starting cluster schema service");
    try {
        initClusterSchemaService();
    } catch (IllegalStateException e) {
        if (e.getCause() != null && e.getCause() instanceof NoSuchColumnFamilyException && tableFamilyDesc == null && replBarrierFamilyDesc == null) {
            LOG.info("ClusterSchema service could not be initialized. This is " + "expected during HBase 1 to 2 upgrade", e);
        } else {
            throw e;
        }
    }
    if (this.cpHost != null) {
        try {
            this.cpHost.preMasterInitialization();
        } catch (IOException e) {
            LOG.error("Coprocessor preMasterInitialization() hook failed", e);
        }
    }
    status.markComplete("Initialization successful");
    LOG.info(String.format("Master has completed initialization %.3fsec", (EnvironmentEdgeManager.currentTime() - masterActiveTime) / 1000.0f));
    this.masterFinishedInitializationTime = EnvironmentEdgeManager.currentTime();
    configurationManager.registerObserver(this.balancer);
    configurationManager.registerObserver(this.hfileCleanerPool);
    configurationManager.registerObserver(this.logCleanerPool);
    configurationManager.registerObserver(this.hfileCleaner);
    configurationManager.registerObserver(this.logCleaner);
    configurationManager.registerObserver(this.regionsRecoveryConfigManager);
    // Set master as 'initialized'.
    setInitialized(true);
    if (tableFamilyDesc == null && replBarrierFamilyDesc == null) {
        // create missing CFs in meta table after master is set to 'initialized'.
        createMissingCFsInMetaDuringUpgrade(metaDescriptor);
        // services will be started during master init phase.
        throw new PleaseRestartMasterException("Aborting active master after missing" + " CFs are successfully added in meta. Subsequent active master " + "initialization should be uninterrupted");
    }
    if (maintenanceMode) {
        LOG.info("Detected repair mode, skipping final initialization steps.");
        return;
    }
    assignmentManager.checkIfShouldMoveSystemRegionAsync();
    status.setStatus("Starting quota manager");
    initQuotaManager();
    if (QuotaUtil.isQuotaEnabled(conf)) {
        // Create the quota snapshot notifier
        spaceQuotaSnapshotNotifier = createQuotaSnapshotNotifier();
        spaceQuotaSnapshotNotifier.initialize(getConnection());
        this.quotaObserverChore = new QuotaObserverChore(this, getMasterMetrics());
        // Start the chore to read the region FS space reports and act on them
        getChoreService().scheduleChore(quotaObserverChore);
        this.snapshotQuotaChore = new SnapshotQuotaObserverChore(this, getMasterMetrics());
        // Start the chore to read snapshots and add their usage to table/NS quotas
        getChoreService().scheduleChore(snapshotQuotaChore);
    }
    final SlowLogMasterService slowLogMasterService = new SlowLogMasterService(conf, this);
    slowLogMasterService.init();
    // clear the dead servers with same host name and port of online server because we are not
    // removing dead server with same hostname and port of rs which is trying to check in before
    // master initialization. See HBASE-5916.
    this.serverManager.clearDeadServersWithSameHostNameAndPortOfOnlineServer();
    // Check and set the znode ACLs if needed in case we are overtaking a non-secure configuration
    status.setStatus("Checking ZNode ACLs");
    zooKeeper.checkAndSetZNodeAcls();
    status.setStatus("Initializing MOB Cleaner");
    initMobCleaner();
    status.setStatus("Calling postStartMaster coprocessors");
    if (this.cpHost != null) {
        // don't let cp initialization errors kill the master
        try {
            this.cpHost.postStartMaster();
        } catch (IOException ioe) {
            LOG.error("Coprocessor postStartMaster() hook failed", ioe);
        }
    }
    zombieDetector.interrupt();
    /*
     * After master has started up, lets do balancer post startup initialization. Since this runs
     * in activeMasterManager thread, it should be fine.
     */
    long start = EnvironmentEdgeManager.currentTime();
    this.balancer.postMasterStartupInitialize();
    if (LOG.isDebugEnabled()) {
        LOG.debug("Balancer post startup initialization complete, took " + ((EnvironmentEdgeManager.currentTime() - start) / 1000) + " seconds");
    }
    this.rollingUpgradeChore = new RollingUpgradeChore(this);
    getChoreService().scheduleChore(rollingUpgradeChore);
}

Example 5 with FavoredNodesManager

use of org.apache.hadoop.hbase.favored.FavoredNodesManager in project hbase by apache.

the class GCRegionProcedure method executeFromState.

@Override
protected Flow executeFromState(MasterProcedureEnv env, GCRegionState state) throws ProcedureSuspendedException, ProcedureYieldException, InterruptedException {
    if (LOG.isTraceEnabled()) {
        LOG.trace(this + " execute state=" + state);
    }
    MasterServices masterServices = env.getMasterServices();
    try {
        switch(state) {
            case GC_REGION_PREPARE:
                // Nothing to do to prepare.
                setNextState(GCRegionState.GC_REGION_ARCHIVE);
                break;
            case GC_REGION_ARCHIVE:
                MasterFileSystem mfs = masterServices.getMasterFileSystem();
                FileSystem fs = mfs.getFileSystem();
                if (HFileArchiver.exists(masterServices.getConfiguration(), fs, getRegion())) {
                    if (LOG.isDebugEnabled()) {
                        LOG.debug("Archiving region=" + getRegion().getShortNameToLog());
                    }
                    HFileArchiver.archiveRegion(masterServices.getConfiguration(), fs, getRegion());
                }
                FileSystem walFs = mfs.getWALFileSystem();
                // Cleanup the directories on WAL filesystem also
                Path regionWALDir = CommonFSUtils.getWALRegionDir(env.getMasterConfiguration(), getRegion().getTable(), getRegion().getEncodedName());
                if (walFs.exists(regionWALDir)) {
                    if (!walFs.delete(regionWALDir, true)) {
                        LOG.debug("Failed to delete {}", regionWALDir);
                    }
                }
                Path wrongRegionWALDir = CommonFSUtils.getWrongWALRegionDir(env.getMasterConfiguration(), getRegion().getTable(), getRegion().getEncodedName());
                if (walFs.exists(wrongRegionWALDir)) {
                    if (!walFs.delete(wrongRegionWALDir, true)) {
                        LOG.debug("Failed to delete {}", regionWALDir);
                    }
                }
                setNextState(GCRegionState.GC_REGION_PURGE_METADATA);
                break;
            case GC_REGION_PURGE_METADATA:
                // TODO: Purge metadata before removing from HDFS? This ordering is copied
                // from CatalogJanitor.
                AssignmentManager am = masterServices.getAssignmentManager();
                if (am != null) {
                    if (am.getRegionStates() != null) {
                        am.getRegionStates().deleteRegion(getRegion());
                    }
                }
                env.getAssignmentManager().getRegionStateStore().deleteRegion(getRegion());
                masterServices.getServerManager().removeRegion(getRegion());
                FavoredNodesManager fnm = masterServices.getFavoredNodesManager();
                if (fnm != null) {
                    fnm.deleteFavoredNodesForRegions(Lists.newArrayList(getRegion()));
                }
                return Flow.NO_MORE_STATE;
            default:
                throw new UnsupportedOperationException(this + " unhandled state=" + state);
        }
    } catch (IOException ioe) {
        // TODO: This is going to spew log? Add retry backoff
        LOG.warn("Error trying to GC " + getRegion().getShortNameToLog() + "; retrying...", ioe);
    }
    return Flow.HAS_MORE_STATE;
}