| /** |
| * 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.regionserver; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hbase.HBaseInterfaceAudience; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import org.apache.hadoop.hbase.client.TableDescriptor; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * The class that creates a flush policy from a conf and HTableDescriptor. |
| * <p> |
| * The default flush policy is {@link FlushLargeStoresPolicy}. And for 0.98, the default flush |
| * policy is {@link FlushAllStoresPolicy}. |
| */ |
| @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG) |
| public class FlushPolicyFactory { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(FlushPolicyFactory.class); |
| |
| public static final String HBASE_FLUSH_POLICY_KEY = "hbase.regionserver.flush.policy"; |
| |
| private static final Class<? extends FlushPolicy> DEFAULT_FLUSH_POLICY_CLASS = |
| FlushAllLargeStoresPolicy.class; |
| |
| /** |
| * Create the FlushPolicy configured for the given table. |
| */ |
| public static FlushPolicy create(HRegion region, Configuration conf) throws IOException { |
| Class<? extends FlushPolicy> clazz = getFlushPolicyClass(region.getTableDescriptor(), conf); |
| FlushPolicy policy = ReflectionUtils.newInstance(clazz, conf); |
| policy.configureForRegion(region); |
| return policy; |
| } |
| |
| /** |
| * Get FlushPolicy class for the given table. |
| */ |
| public static Class<? extends FlushPolicy> getFlushPolicyClass(TableDescriptor htd, |
| Configuration conf) throws IOException { |
| String className = htd.getFlushPolicyClassName(); |
| if (className == null) { |
| className = conf.get(HBASE_FLUSH_POLICY_KEY, DEFAULT_FLUSH_POLICY_CLASS.getName()); |
| } |
| try { |
| Class<? extends FlushPolicy> clazz = Class.forName(className).asSubclass(FlushPolicy.class); |
| return clazz; |
| } catch (Exception e) { |
| LOG.warn( |
| "Unable to load configured flush policy '" + className + "' for table '" |
| + htd.getTableName() + "', load default flush policy " |
| + DEFAULT_FLUSH_POLICY_CLASS.getName() + " instead", e); |
| return DEFAULT_FLUSH_POLICY_CLASS; |
| } |
| } |
| } |