| /** |
| * 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.yarn.server.resourcemanager; |
| |
| import org.apache.hadoop.thirdparty.com.google.common.annotations.VisibleForTesting; |
| import org.apache.hadoop.util.Time; |
| import org.apache.hadoop.yarn.proto.YarnServerCommonProtos; |
| import org.apache.hadoop.yarn.server.records.Version; |
| import org.apache.hadoop.yarn.server.records.impl.pb.VersionPBImpl; |
| import org.fusesource.leveldbjni.JniDBFactory; |
| import org.fusesource.leveldbjni.internal.NativeDB; |
| import org.iq80.leveldb.DB; |
| import org.iq80.leveldb.DBException; |
| import org.iq80.leveldb.Options; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.Closeable; |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.function.Consumer; |
| |
| import static org.fusesource.leveldbjni.JniDBFactory.bytes; |
| |
| public class DBManager implements Closeable { |
| public static final Logger LOG = |
| LoggerFactory.getLogger(DBManager.class); |
| private DB db; |
| private Timer compactionTimer; |
| |
| public DB initDatabase(File configurationFile, Options options, |
| Consumer<DB> initMethod) throws Exception { |
| try { |
| db = JniDBFactory.factory.open(configurationFile, options); |
| } catch (NativeDB.DBException e) { |
| if (e.isNotFound() || e.getMessage().contains(" does not exist ")) { |
| LOG.info("Creating configuration version/database at {}", |
| configurationFile); |
| options.createIfMissing(true); |
| try { |
| db = JniDBFactory.factory.open(configurationFile, options); |
| initMethod.accept(db); |
| } catch (DBException dbErr) { |
| throw new IOException(dbErr.getMessage(), dbErr); |
| } |
| } else { |
| throw e; |
| } |
| } |
| |
| return db; |
| } |
| |
| public void close() throws IOException { |
| if (compactionTimer != null) { |
| compactionTimer.cancel(); |
| compactionTimer = null; |
| } |
| if (db != null) { |
| db.close(); |
| db = null; |
| } |
| } |
| |
| public void storeVersion(String versionKey, Version versionValue) { |
| byte[] data = ((VersionPBImpl) versionValue).getProto().toByteArray(); |
| db.put(bytes(versionKey), data); |
| } |
| |
| public Version loadVersion(String versionKey) throws Exception { |
| Version version = null; |
| try { |
| byte[] data = db.get(bytes(versionKey)); |
| if (data != null) { |
| version = new VersionPBImpl(YarnServerCommonProtos.VersionProto |
| .parseFrom(data)); |
| } |
| } catch (DBException e) { |
| throw new IOException(e); |
| } |
| return version; |
| } |
| |
| @VisibleForTesting |
| public void setDb(DB db) { |
| this.db = db; |
| } |
| |
| public void startCompactionTimer(long compactionIntervalMsec, |
| String className) { |
| if (compactionIntervalMsec > 0) { |
| compactionTimer = new Timer( |
| className + " compaction timer", true); |
| compactionTimer.schedule(new CompactionTimerTask(), |
| compactionIntervalMsec, compactionIntervalMsec); |
| } |
| } |
| |
| private class CompactionTimerTask extends TimerTask { |
| @Override |
| public void run() { |
| long start = Time.monotonicNow(); |
| LOG.info("Starting full compaction cycle"); |
| try { |
| db.compactRange(null, null); |
| } catch (DBException e) { |
| LOG.error("Error compacting database", e); |
| } |
| long duration = Time.monotonicNow() - start; |
| LOG.info("Full compaction cycle completed in " + duration + " msec"); |
| } |
| } |
| } |