/**
* 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 java.util.ArrayList;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.KeyValue.KVComparator;
import org.apache.hadoop.hbase.regionserver.compactions.CompactionContext;
import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
import org.apache.hadoop.hbase.regionserver.compactions.StripeCompactionPolicy;
import org.apache.hadoop.hbase.regionserver.compactions.StripeCompactor;
import com.google.common.base.Preconditions;
/**
* The storage engine that implements the stripe-based store/compaction scheme.
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public class StripeStoreEngine extends StoreEngine<StripeStoreFlusher,
StripeCompactionPolicy, StripeCompactor, StripeStoreFileManager> {
static final Log LOG = LogFactory.getLog(StripeStoreEngine.class);
private StripeStoreConfig config;
@Override
public boolean needsCompaction(List<StoreFile> filesCompacting) {
return this.compactionPolicy.needsCompactions(this.storeFileManager, filesCompacting);
}
@Override
public CompactionContext createCompaction() {
return new StripeCompaction();
}
@Override
protected void createComponents(
Configuration conf, Store store, KVComparator comparator) throws IOException {
this.config = new StripeStoreConfig(conf, store);
this.compactionPolicy = new StripeCompactionPolicy(conf, store, config);
this.storeFileManager = new StripeStoreFileManager(comparator, conf, this.config);
this.storeFlusher = new StripeStoreFlusher(
conf, store, this.compactionPolicy, this.storeFileManager);
this.compactor = new StripeCompactor(conf, store);
}
/**
* Represents one instance of stripe compaction, with the necessary context and flow.
*/
private class StripeCompaction extends CompactionContext {
private StripeCompactionPolicy.StripeCompactionRequest stripeRequest = null;
@Override
public List<StoreFile> preSelect(List<StoreFile> filesCompacting) {
return compactionPolicy.preSelectFilesForCoprocessor(storeFileManager, filesCompacting);
}
@Override
public boolean select(List<StoreFile> filesCompacting, boolean isUserCompaction,
boolean mayUseOffPeak, boolean forceMajor) throws IOException {
this.stripeRequest = compactionPolicy.selectCompaction(
storeFileManager, filesCompacting, mayUseOffPeak);
this.request = (this.stripeRequest == null)
? new CompactionRequest(new ArrayList<StoreFile>()) : this.stripeRequest.getRequest();
return this.stripeRequest != null;
}
@Override
public void forceSelect(CompactionRequest request) {
super.forceSelect(request);
if (this.stripeRequest != null) {
this.stripeRequest.setRequest(this.request);
} else {
LOG.warn("Stripe store is forced to take an arbitrary file list and compact it.");
this.stripeRequest = compactionPolicy.createEmptyRequest(storeFileManager, this.request);
}
}
@Override
public List<Path> compact() throws IOException {
Preconditions.checkArgument(this.stripeRequest != null, "Cannot compact without selection");
return this.stripeRequest.execute(compactor);
}
}
}