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/*
* 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.spark.network.util;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.fusesource.leveldbjni.JniDBFactory;
import org.fusesource.leveldbjni.internal.NativeDB;
import org.iq80.leveldb.DB;
import org.iq80.leveldb.Options;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* LevelDB utility class available in the network package.
*/
public class LevelDBProvider {
private static final Logger logger = LoggerFactory.getLogger(LevelDBProvider.class);
public static DB initLevelDB(File dbFile, StoreVersion version, ObjectMapper mapper) throws
IOException {
DB tmpDb = null;
if (dbFile != null) {
Options options = new Options();
options.createIfMissing(false);
options.logger(new LevelDBLogger());
try {
tmpDb = JniDBFactory.factory.open(dbFile, options);
} catch (NativeDB.DBException e) {
if (e.isNotFound() || e.getMessage().contains(" does not exist ")) {
logger.info("Creating state database at " + dbFile);
options.createIfMissing(true);
try {
tmpDb = JniDBFactory.factory.open(dbFile, options);
} catch (NativeDB.DBException dbExc) {
throw new IOException("Unable to create state store", dbExc);
}
} else {
// the leveldb file seems to be corrupt somehow. Lets just blow it away and create a new
// one, so we can keep processing new apps
logger.error("error opening leveldb file {}. Creating new file, will not be able to " +
"recover state for existing applications", dbFile, e);
if (dbFile.isDirectory()) {
for (File f : dbFile.listFiles()) {
if (!f.delete()) {
logger.warn("error deleting {}", f.getPath());
}
}
}
if (!dbFile.delete()) {
logger.warn("error deleting {}", dbFile.getPath());
}
options.createIfMissing(true);
try {
tmpDb = JniDBFactory.factory.open(dbFile, options);
} catch (NativeDB.DBException dbExc) {
throw new IOException("Unable to create state store", dbExc);
}
}
}
// if there is a version mismatch, we throw an exception, which means the service is unusable
checkVersion(tmpDb, version, mapper);
}
return tmpDb;
}
private static class LevelDBLogger implements org.iq80.leveldb.Logger {
private static final Logger LOG = LoggerFactory.getLogger(LevelDBLogger.class);
@Override
public void log(String message) {
LOG.info(message);
}
}
/**
* Simple major.minor versioning scheme. Any incompatible changes should be across major
* versions. Minor version differences are allowed -- meaning we should be able to read
* dbs that are either earlier *or* later on the minor version.
*/
public static void checkVersion(DB db, StoreVersion newversion, ObjectMapper mapper) throws
IOException {
byte[] bytes = db.get(StoreVersion.KEY);
if (bytes == null) {
storeVersion(db, newversion, mapper);
} else {
StoreVersion version = mapper.readValue(bytes, StoreVersion.class);
if (version.major != newversion.major) {
throw new IOException("cannot read state DB with version " + version + ", incompatible " +
"with current version " + newversion);
}
storeVersion(db, newversion, mapper);
}
}
public static void storeVersion(DB db, StoreVersion version, ObjectMapper mapper)
throws IOException {
db.put(StoreVersion.KEY, mapper.writeValueAsBytes(version));
}
public static class StoreVersion {
final static byte[] KEY = "StoreVersion".getBytes(StandardCharsets.UTF_8);
public final int major;
public final int minor;
@JsonCreator
public StoreVersion(@JsonProperty("major") int major, @JsonProperty("minor") int minor) {
this.major = major;
this.minor = minor;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
StoreVersion that = (StoreVersion) o;
return major == that.major && minor == that.minor;
}
@Override
public int hashCode() {
int result = major;
result = 31 * result + minor;
return result;
}
}
}
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