| /* |
| * 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.Set; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.locks.ReadWriteLock; |
| import org.apache.hadoop.hbase.CatalogFamilyFormat; |
| import org.apache.hadoop.hbase.ClientMetaTableAccessor; |
| import org.apache.hadoop.hbase.MetaTableAccessor; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.TableNotFoundException; |
| import org.apache.hadoop.hbase.client.Result; |
| 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.IdReadWriteLockWithObjectPool; |
| import org.apache.yetus.audience.InterfaceAudience; |
| 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 accessing its methods. |
| */ |
| @InterfaceAudience.Private |
| public class TableStateManager { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(TableStateManager.class); |
| |
| private final IdReadWriteLock<TableName> tnLock = new IdReadWriteLockWithObjectPool<>(); |
| private final MasterServices master; |
| |
| private final ConcurrentMap<TableName, TableState.State> tableName2State = |
| new ConcurrentHashMap<>(); |
| |
| 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(); |
| } |
| } |
| |
| 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)) { |
| // Can't delete the hbase:meta table. |
| return; |
| } |
| ReadWriteLock lock = tnLock.getLock(tableName); |
| lock.writeLock().lock(); |
| try { |
| MetaTableAccessor.deleteTableState(master.getConnection(), 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 |
| */ |
| 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 ClientMetaTableAccessor.Visitor() { |
| @Override |
| public boolean visit(Result r) throws IOException { |
| TableState tableState = CatalogFamilyFormat.getTableState(r); |
| if (tableState != null && tableState.inStates(states)) { |
| rv.add(tableState.getTableName()); |
| } |
| return true; |
| } |
| }); |
| return rv; |
| } |
| |
| @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 TableNotFoundException("No state found for " + 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 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) { |
| this.tableName2State.remove(tableName); |
| } |
| } |
| } |
| |
| @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; |
| } |
| } |