| /* |
| * 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.drill.exec.store.sys.store; |
| |
| import org.apache.commons.io.IOUtils; |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.common.exceptions.DrillRuntimeException; |
| import org.apache.drill.exec.store.dfs.DrillFileSystem; |
| import org.apache.drill.exec.store.sys.BasePersistentStore; |
| import org.apache.drill.exec.store.sys.PersistentStoreConfig; |
| import org.apache.drill.exec.store.sys.PersistentStoreMode; |
| import org.apache.drill.exec.util.DrillFileSystemUtil; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.PathFilter; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| import static org.apache.drill.exec.ExecConstants.DRILL_SYS_FILE_SUFFIX; |
| |
| /** |
| * Local persistent store stores its data on the given file system. |
| * Data is stored in the files with key name as a base and |
| * {@link org.apache.drill.exec.ExecConstants#DRILL_SYS_FILE_SUFFIX} suffix. |
| * |
| * @param <V> store data type |
| */ |
| public class LocalPersistentStore<V> extends BasePersistentStore<V> { |
| |
| private static final Logger logger = LoggerFactory.getLogger(LocalPersistentStore.class); |
| |
| private static final PathFilter SYS_FILE_SUFFIX_FILTER = path -> path.getName().endsWith(DRILL_SYS_FILE_SUFFIX); |
| |
| private final Path basePath; |
| |
| private final PersistentStoreConfig<V> config; |
| |
| private final DrillFileSystem fs; |
| |
| public LocalPersistentStore(DrillFileSystem fs, Path base, PersistentStoreConfig<V> config) { |
| this.basePath = new Path(base, config.getName()); |
| this.config = config; |
| this.fs = fs; |
| try { |
| fs.mkdirs(basePath); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Failure setting local persistent store path [%s]: %s", |
| basePath, e.getMessage()); |
| } |
| } |
| |
| @Override |
| public PersistentStoreMode getMode() { |
| return PersistentStoreMode.PERSISTENT; |
| } |
| |
| public static Path getLogDir() { |
| String drillLogDir = System.getenv("DRILL_LOG_DIR"); |
| if (drillLogDir == null) { |
| drillLogDir = System.getProperty("drill.log.dir"); |
| } |
| if (drillLogDir == null) { |
| drillLogDir = "/var/log/drill"; |
| } |
| return new Path(new File(drillLogDir).getAbsoluteFile().toURI()); |
| } |
| |
| public static DrillFileSystem getFileSystem(DrillConfig config, Path root) throws IOException { |
| Path blobRoot = root == null ? getLogDir() : root; |
| Configuration fsConf = new Configuration(); |
| if (blobRoot.toUri().getScheme() != null) { |
| fsConf.set(FileSystem.FS_DEFAULT_NAME_KEY, blobRoot.toUri().toString()); |
| } |
| |
| |
| DrillFileSystem fs = new DrillFileSystem(fsConf); |
| fs.mkdirs(blobRoot); |
| return fs; |
| } |
| |
| @Override |
| public Iterator<Map.Entry<String, V>> getRange(int skip, int take) { |
| List<FileStatus> fileStatuses; |
| try { |
| fileStatuses = DrillFileSystemUtil.listFiles(fs, basePath, false, SYS_FILE_SUFFIX_FILTER); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable to retrieve store data: %s", e.getMessage()); |
| } |
| |
| if (fileStatuses.isEmpty()) { |
| return Collections.emptyIterator(); |
| } |
| |
| return fileStatuses.stream() |
| .map(this::extractKeyName) |
| .sorted() |
| .skip(skip) |
| .limit(take) |
| .collect(Collectors.toMap( |
| Function.identity(), |
| this::get, |
| (o, n) -> n, |
| LinkedHashMap::new)) |
| .entrySet() |
| .iterator(); |
| } |
| |
| @Override |
| public boolean contains(String key) { |
| Path path = makePath(key, false); |
| return exists(path); |
| } |
| |
| @Override |
| public V get(String key) { |
| Path path = makePath(key, false); |
| if (!exists(path)) { |
| return null; |
| } |
| |
| try (InputStream is = fs.open(path)) { |
| byte[] bytes = IOUtils.toByteArray(is); |
| return deserialize(path, bytes); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable to retrieve store data for the path [%s]: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| @Override |
| public void put(String key, V value) { |
| Path path = makePath(key, true); |
| put(path, value); |
| } |
| |
| @Override |
| public boolean putIfAbsent(String key, V value) { |
| Path path = makePath(key, true); |
| if (exists(path)) { |
| return false; |
| } |
| |
| put(path, value); |
| return true; |
| } |
| |
| @Override |
| public void delete(String key) { |
| Path path = makePath(key, true); |
| try { |
| fs.delete(path, false); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable to delete store data for the path [%s]: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| /** |
| * Checks if given key name is valid. Since store data is persisted on the file system, |
| * key name must not be null or contain any special characters. |
| * |
| * @param key key name |
| * @return true if key name is valid, false otherwise |
| */ |
| private boolean isValidKey(String key) { |
| return key != null |
| && !key.isEmpty() |
| && !key.contains(":") |
| && !key.contains("..") |
| && !key.contains("/"); |
| } |
| |
| /** |
| * Constructs path based on given path name. |
| * If given key is invalid, will fail only if {@code failOnInvalidKey} is passed as true, |
| * otherwise will return null value. |
| * |
| * @param key key name |
| * @param failOnInvalidKey flag indicating if exception should be on the invalid key |
| * @return constructed path relevant to the current store configuration |
| */ |
| private Path makePath(String key, boolean failOnInvalidKey) { |
| if (isValidKey(key)) { |
| try { |
| return new Path(basePath, key + DRILL_SYS_FILE_SUFFIX); |
| } catch (IllegalArgumentException e) { |
| return handleInvalidKey(key, e, failOnInvalidKey); |
| } |
| } else { |
| return handleInvalidKey(key, null, failOnInvalidKey); |
| } |
| } |
| |
| private Path handleInvalidKey(String key, Throwable throwable, boolean failOnInvalidKey) { |
| if (failOnInvalidKey) { |
| throw DrillRuntimeException.create(throwable, "Illegal storage key name: %s", key); |
| } else { |
| logger.debug("Illegal storage key name: {}", key, throwable); |
| return null; |
| } |
| } |
| |
| private boolean exists(Path path) { |
| try { |
| return path != null && fs.exists(path); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable to check store file [%s] existence: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| private byte[] serialize(Path path, V value) { |
| try { |
| return config.getSerializer().serialize(value); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable serialize value for the store key [%s]: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| private V deserialize(Path path, byte[] bytes) { |
| try { |
| return config.getSerializer().deserialize(bytes); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable deserialize value for the path [%s]: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| private void put(Path path, V value) { |
| try (OutputStream os = fs.create(path)) { |
| IOUtils.write(serialize(path, value), os); |
| } catch (IOException e) { |
| throw DrillRuntimeException.create(e, "Unable to store data for the path [%s]: %s", |
| path, e.getMessage()); |
| } |
| } |
| |
| /** |
| * Extracts key name from file status. |
| * Key name is base of the file name where key data is stored. |
| * {@link org.apache.drill.exec.ExecConstants#DRILL_SYS_FILE_SUFFIX} |
| * should be removed from the file name to obtain key name. |
| * |
| * @param fileStatus file status |
| * @return key name |
| */ |
| private String extractKeyName(FileStatus fileStatus) { |
| String name = fileStatus.getPath().getName(); |
| return name.substring(0, name.length() - DRILL_SYS_FILE_SUFFIX.length()); |
| } |
| } |