org.apache.hudi.org.apache.hadoop.hbase.regionserver.FlushPolicyFactory Maven / Gradle / Ivy
/**
* 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.
*
* 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 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 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 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 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;
}
}
}