| /** |
| * 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 edu.umd.cs.findbugs.annotations.NonNull; |
| import edu.umd.cs.findbugs.annotations.Nullable; |
| import java.io.IOException; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import org.apache.hadoop.hbase.MetaTableAccessor; |
| import org.apache.hadoop.hbase.TableDescriptors; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.TableNotFoundException; |
| import org.apache.hadoop.hbase.client.Connection; |
| import org.apache.hadoop.hbase.client.Result; |
| import org.apache.hadoop.hbase.client.TableDescriptor; |
| import org.apache.hadoop.hbase.client.TableState; |
| import org.apache.hadoop.hbase.exceptions.IllegalArgumentIOException; |
| import org.apache.hadoop.hbase.util.IdReadWriteLock; |
| import org.apache.hadoop.hbase.util.ZKDataMigrator; |
| import org.apache.hadoop.hbase.zookeeper.ZKUtil; |
| 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.common.collect.Sets; |
| |
| /** |
| * This is a helper class used to manage table states. This class uses hbase:meta as its store for |
| * table state so hbase:meta must be online before {@link #start()} is called. |
| */ |
| // TODO: Make this a guava Service |
| @InterfaceAudience.Private |
| public class TableStateManager { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(TableStateManager.class); |
| /** |
| * Set this key to false in Configuration to disable migrating table state from zookeeper so |
| * hbase:meta table. |
| */ |
| private static final String MIGRATE_TABLE_STATE_FROM_ZK_KEY = |
| "hbase.migrate.table.state.from.zookeeper"; |
| |
| private final IdReadWriteLock<TableName> tnLock = new IdReadWriteLock<>(); |
| protected final MasterServices master; |
| |
| private final ConcurrentMap<TableName, TableState.State> tableName2State = |
| new ConcurrentHashMap<>(); |
| |
| public TableStateManager(MasterServices master) { |
| this.master = master; |
| } |
| |
| /** |
| * Set table state to provided. Caller should lock table on write. |
| * @param tableName table to change state for |
| * @param newState new state |
| */ |
| public void setTableState(TableName tableName, TableState.State newState) throws IOException { |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.writeLock().lock(); |
| try { |
| updateMetaState(tableName, newState); |
| } finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| /** |
| * Set table state to provided but only if table in specified states Caller should lock table on |
| * write. |
| * @param tableName table to change state for |
| * @param newState new state |
| * @param states states to check against |
| * @return null if succeed or table state if failed |
| */ |
| public TableState setTableStateIfInStates(TableName tableName, TableState.State newState, |
| TableState.State... states) throws IOException { |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.writeLock().lock(); |
| try { |
| TableState currentState = readMetaState(tableName); |
| if (currentState == null) { |
| throw new TableNotFoundException(tableName); |
| } |
| if (currentState.inStates(states)) { |
| updateMetaState(tableName, newState); |
| return null; |
| } else { |
| return currentState; |
| } |
| } finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| /** |
| * Set table state to provided but only if table not in specified states Caller should lock table |
| * on write. |
| * @param tableName table to change state for |
| * @param newState new state |
| * @param states states to check against |
| */ |
| public boolean setTableStateIfNotInStates(TableName tableName, TableState.State newState, |
| TableState.State... states) throws IOException { |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.writeLock().lock(); |
| try { |
| TableState currentState = readMetaState(tableName); |
| if (currentState == null) { |
| throw new TableNotFoundException(tableName); |
| } |
| if (!currentState.inStates(states)) { |
| updateMetaState(tableName, newState); |
| return true; |
| } else { |
| return false; |
| } |
| } finally { |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| public boolean isTableState(TableName tableName, TableState.State... states) { |
| try { |
| TableState tableState = getTableState(tableName); |
| return tableState.isInStates(states); |
| } catch (IOException e) { |
| LOG.error("Unable to get table " + tableName + " state", e); |
| // XXX: is it safe to just return false here? |
| return false; |
| } |
| } |
| |
| public void setDeletedTable(TableName tableName) throws IOException { |
| if (tableName.equals(TableName.META_TABLE_NAME)) { |
| return; |
| } |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.writeLock().lock(); |
| try { |
| MetaTableAccessor.deleteTableState(master.getConnection(), tableName); |
| metaStateDeleted(tableName); |
| } finally { |
| tableName2State.remove(tableName); |
| lock.writeLock().unlock(); |
| } |
| } |
| |
| public boolean isTablePresent(TableName tableName) throws IOException { |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.readLock().lock(); |
| try { |
| return readMetaState(tableName) != null; |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| /** |
| * Return all tables in given states. |
| * @param states filter by states |
| * @return tables in given states |
| */ |
| public Set<TableName> getTablesInStates(TableState.State... states) throws IOException { |
| // Only be called in region normalizer, will not use cache. |
| final Set<TableName> rv = Sets.newHashSet(); |
| MetaTableAccessor.fullScanTables(master.getConnection(), new MetaTableAccessor.Visitor() { |
| @Override |
| public boolean visit(Result r) throws IOException { |
| TableState tableState = MetaTableAccessor.getTableState(r); |
| if (tableState != null && tableState.inStates(states)) { |
| rv.add(tableState.getTableName()); |
| } |
| return true; |
| } |
| }); |
| return rv; |
| } |
| |
| public static class TableStateNotFoundException extends TableNotFoundException { |
| TableStateNotFoundException(TableName tableName) { |
| super(tableName.getNameAsString()); |
| } |
| } |
| |
| @NonNull |
| public TableState getTableState(TableName tableName) throws IOException { |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.readLock().lock(); |
| try { |
| TableState currentState = readMetaState(tableName); |
| if (currentState == null) { |
| throw new TableStateNotFoundException(tableName); |
| } |
| return currentState; |
| } finally { |
| lock.readLock().unlock(); |
| } |
| } |
| |
| private void updateMetaState(TableName tableName, TableState.State newState) throws IOException { |
| if (tableName.equals(TableName.META_TABLE_NAME)) { |
| if (TableState.State.DISABLING.equals(newState) || |
| TableState.State.DISABLED.equals(newState)) { |
| throw new IllegalArgumentIOException("Cannot disable the meta table; " + newState); |
| } |
| // Otherwise, just return; no need to set ENABLED on meta -- it is always ENABLED. |
| return; |
| } |
| boolean succ = false; |
| try { |
| MetaTableAccessor.updateTableState(master.getConnection(), tableName, newState); |
| tableName2State.put(tableName, newState); |
| succ = true; |
| } finally { |
| if (!succ) { |
| tableName2State.remove(tableName); |
| } |
| } |
| metaStateUpdated(tableName, newState); |
| } |
| |
| protected void metaStateUpdated(TableName tableName, TableState.State newState) |
| throws IOException { |
| } |
| |
| protected void metaStateDeleted(TableName tableName) throws IOException { |
| } |
| |
| @Nullable |
| private TableState readMetaState(TableName tableName) throws IOException { |
| TableState.State state = tableName2State.get(tableName); |
| if (state != null) { |
| return new TableState(tableName, state); |
| } |
| TableState tableState = MetaTableAccessor.getTableState(master.getConnection(), tableName); |
| if (tableState != null) { |
| tableName2State.putIfAbsent(tableName, tableState.getState()); |
| } |
| return tableState; |
| } |
| |
| public void start() throws IOException { |
| TableDescriptors tableDescriptors = master.getTableDescriptors(); |
| migrateZooKeeper(); |
| Connection connection = master.getConnection(); |
| fixTableStates(tableDescriptors, connection); |
| } |
| |
| private void fixTableStates(TableDescriptors tableDescriptors, Connection connection) |
| throws IOException { |
| Map<String, TableState> states = new HashMap<>(); |
| // NOTE: Full hbase:meta table scan! |
| MetaTableAccessor.fullScanTables(connection, new MetaTableAccessor.Visitor() { |
| @Override |
| public boolean visit(Result r) throws IOException { |
| TableState state = MetaTableAccessor.getTableState(r); |
| states.put(state.getTableName().getNameAsString(), state); |
| return true; |
| } |
| }); |
| for (TableDescriptor tableDesc : tableDescriptors.getAll().values()) { |
| TableName tableName = tableDesc.getTableName(); |
| if (TableName.isMetaTableName(tableName)) { |
| // This table is always enabled. No fixup needed. No entry in hbase:meta needed. |
| // Call through to fixTableState though in case a super class wants to do something. |
| fixTableState(new TableState(tableName, TableState.State.ENABLED)); |
| continue; |
| } |
| TableState tableState = states.get(tableName.getNameAsString()); |
| if (tableState == null) { |
| LOG.warn(tableName + " has no table state in hbase:meta, assuming ENABLED"); |
| MetaTableAccessor.updateTableState(connection, tableName, TableState.State.ENABLED); |
| fixTableState(new TableState(tableName, TableState.State.ENABLED)); |
| tableName2State.put(tableName, TableState.State.ENABLED); |
| } else { |
| fixTableState(tableState); |
| tableName2State.put(tableName, tableState.getState()); |
| } |
| } |
| } |
| |
| /** |
| * For subclasses in case they want to do fixup post hbase:meta. |
| */ |
| protected void fixTableState(TableState tableState) throws IOException { |
| } |
| |
| /** |
| * This code is for case where a hbase2 Master is starting for the first time. ZooKeeper is where |
| * we used to keep table state. On first startup, read zookeeper and update hbase:meta with the |
| * table states found in zookeeper. This is tricky as we'll do this check every time we startup |
| * until mirroring is disabled. See the {@link #MIGRATE_TABLE_STATE_FROM_ZK_KEY} flag. Original |
| * form of this migration came in with HBASE-13032. It deleted all znodes when done. We can't do |
| * that if we want to support hbase-1.x clients who need to be able to read table state out of zk. |
| * See {@link MirroringTableStateManager}. |
| * @deprecated Since 2.0.0. Remove in hbase-3.0.0. |
| */ |
| @Deprecated |
| private void migrateZooKeeper() throws IOException { |
| if (!this.master.getConfiguration().getBoolean(MIGRATE_TABLE_STATE_FROM_ZK_KEY, true)) { |
| return; |
| } |
| try { |
| for (Map.Entry<TableName, TableState.State> entry : ZKDataMigrator |
| .queryForTableStates(this.master.getZooKeeper()).entrySet()) { |
| if (this.master.getTableDescriptors().get(entry.getKey()) == null) { |
| deleteZooKeeper(entry.getKey()); |
| LOG.info("Purged table state entry from zookeepr for table not in hbase:meta: " + |
| entry.getKey()); |
| continue; |
| } |
| TableState ts = null; |
| try { |
| ts = getTableState(entry.getKey()); |
| } catch (TableStateNotFoundException e) { |
| // This can happen; table exists but no TableState. |
| } |
| if (ts == null) { |
| TableState.State zkstate = entry.getValue(); |
| // Only migrate if it is an enable or disabled table. If in-between -- ENABLING or |
| // DISABLING then we have a problem; we are starting up an hbase-2 on a cluster with |
| // RIT. It is going to be rough! |
| if (zkstate.equals(TableState.State.ENABLED) || |
| zkstate.equals(TableState.State.DISABLED)) { |
| LOG.info("Migrating table state from zookeeper to hbase:meta; tableName=" + |
| entry.getKey() + ", state=" + entry.getValue()); |
| updateMetaState(entry.getKey(), entry.getValue()); |
| } else { |
| LOG.warn("Table={} has no state and zookeeper state is in-between={} (neither " + |
| "ENABLED or DISABLED); NOT MIGRATING table state", entry.getKey(), zkstate); |
| } |
| } |
| // What if the table states disagree? Defer to the hbase:meta setting rather than have the |
| // hbase-1.x support prevail. |
| } |
| } catch (KeeperException | InterruptedException e) { |
| LOG.warn("Failed reading table state from zookeeper", e); |
| } |
| } |
| |
| /** |
| * Utility method that knows how to delete the old hbase-1.x table state znode. Used also by the |
| * Mirroring subclass. |
| * @deprecated Since 2.0.0. To be removed in hbase-3.0.0. |
| */ |
| @Deprecated |
| protected void deleteZooKeeper(TableName tableName) { |
| try { |
| // Delete from ZooKeeper |
| String znode = ZNodePaths.joinZNode(this.master.getZooKeeper().getZNodePaths().tableZNode, |
| tableName.getNameAsString()); |
| ZKUtil.deleteNodeFailSilent(this.master.getZooKeeper(), znode); |
| } catch (KeeperException e) { |
| LOG.warn("Failed deleting table state from zookeeper", e); |
| } |
| } |
| } |