| /** |
| * 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.storm.blobstore; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.nio.file.FileVisitResult; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.SimpleFileVisitor; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| |
| import org.apache.storm.Config; |
| import org.apache.storm.utils.Utils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Very basic blob store impl with no ACL handling. |
| */ |
| public class FileBlobStoreImpl { |
| private static final long FULL_CLEANUP_FREQ = 60 * 60 * 1000l; |
| private static final int BUCKETS = 1024; |
| private static final Logger LOG = LoggerFactory.getLogger(FileBlobStoreImpl.class); |
| private static final Timer timer = new Timer("FileBlobStore cleanup thread", true); |
| |
| public class KeyInHashDirIterator implements Iterator<String> { |
| private int currentBucket = 0; |
| private Iterator<String> it = null; |
| private String next = null; |
| |
| public KeyInHashDirIterator() throws IOException { |
| primeNext(); |
| } |
| |
| private void primeNext() throws IOException { |
| while (it == null && currentBucket < BUCKETS) { |
| String name = String.valueOf(currentBucket); |
| File dir = new File(fullPath, name); |
| try { |
| it = listKeys(dir); |
| } catch (FileNotFoundException e) { |
| it = null; |
| } |
| if (it == null || !it.hasNext()) { |
| it = null; |
| currentBucket++; |
| } else { |
| next = it.next(); |
| } |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return next != null; |
| } |
| |
| @Override |
| public String next() { |
| if (!hasNext()) { |
| throw new NoSuchElementException(); |
| } |
| String current = next; |
| next = null; |
| if (it != null) { |
| if (!it.hasNext()) { |
| it = null; |
| currentBucket++; |
| try { |
| primeNext(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } else { |
| next = it.next(); |
| } |
| } |
| return current; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException("Delete Not Supported"); |
| } |
| } |
| |
| private File fullPath; |
| private TimerTask cleanup = null; |
| |
| public FileBlobStoreImpl(File path, Map<String, Object> conf) throws IOException { |
| LOG.info("Creating new blob store based in {}", path); |
| fullPath = path; |
| fullPath.mkdirs(); |
| Object shouldCleanup = conf.get(Config.BLOBSTORE_CLEANUP_ENABLE); |
| if (Utils.getBoolean(shouldCleanup, false)) { |
| LOG.debug("Starting File blobstore cleaner"); |
| cleanup = new TimerTask() { |
| @Override |
| public void run() { |
| try { |
| fullCleanup(FULL_CLEANUP_FREQ); |
| } catch (IOException e) { |
| LOG.error("Error trying to cleanup", e); |
| } |
| } |
| }; |
| timer.scheduleAtFixedRate(cleanup, 0, FULL_CLEANUP_FREQ); |
| } |
| } |
| |
| /** |
| * @return all keys that are available for reading. |
| * @throws IOException on any error. |
| */ |
| public Iterator<String> listKeys() throws IOException { |
| return new KeyInHashDirIterator(); |
| } |
| |
| /** |
| * Get an input stream for reading a part. |
| * @param key the key of the part to read. |
| * @return the where to read the data from. |
| * @throws IOException on any error |
| */ |
| public LocalFsBlobStoreFile read(String key) throws IOException { |
| return new LocalFsBlobStoreFile(getKeyDir(key), BlobStoreFile.BLOBSTORE_DATA_FILE); |
| } |
| |
| /** |
| * Get an object tied to writing the data. |
| * @param key the key of the part to write to. |
| * @return an object that can be used to both write to, but also commit/cancel the operation. |
| * @throws IOException on any error |
| */ |
| public LocalFsBlobStoreFile write(String key, boolean create) throws IOException { |
| return new LocalFsBlobStoreFile(getKeyDir(key), true, create); |
| } |
| |
| /** |
| * Check if the key exists in the blob store. |
| * @param key the key to check for |
| * @return true if it exists else false. |
| */ |
| public boolean exists(String key) { |
| return getKeyDir(key).exists(); |
| } |
| |
| /** |
| * Delete a key from the blob store |
| * @param key the key to delete |
| * @throws IOException on any error |
| */ |
| public void deleteKey(String key) throws IOException { |
| File keyDir = getKeyDir(key); |
| LocalFsBlobStoreFile pf = new LocalFsBlobStoreFile(keyDir, BlobStoreFile.BLOBSTORE_DATA_FILE); |
| pf.delete(); |
| delete(keyDir); |
| } |
| |
| private File getKeyDir(String key) { |
| String hash = String.valueOf(Math.abs((long)key.hashCode()) % BUCKETS); |
| File ret = new File(new File(fullPath, hash), key); |
| LOG.debug("{} Looking for {} in {}", new Object[]{fullPath, key, hash}); |
| return ret; |
| } |
| |
| public void fullCleanup(long age) throws IOException { |
| long cleanUpIfBefore = System.currentTimeMillis() - age; |
| Iterator<String> keys = new KeyInHashDirIterator(); |
| while (keys.hasNext()) { |
| String key = keys.next(); |
| File keyDir = getKeyDir(key); |
| Iterator<LocalFsBlobStoreFile> i = listBlobStoreFiles(keyDir); |
| if (!i.hasNext()) { |
| //The dir is empty, so try to delete it, may fail, but that is OK |
| try { |
| keyDir.delete(); |
| } catch (Exception e) { |
| LOG.warn("Could not delete "+keyDir+" will try again later"); |
| } |
| } |
| while (i.hasNext()) { |
| LocalFsBlobStoreFile f = i.next(); |
| if (f.isTmp()) { |
| if (f.getModTime() <= cleanUpIfBefore) { |
| f.delete(); |
| } |
| } |
| } |
| } |
| } |
| |
| protected Iterator<LocalFsBlobStoreFile> listBlobStoreFiles(File path) throws IOException { |
| ArrayList<LocalFsBlobStoreFile> ret = new ArrayList<LocalFsBlobStoreFile>(); |
| File[] files = path.listFiles(); |
| if (files != null) { |
| for (File sub: files) { |
| try { |
| ret.add(new LocalFsBlobStoreFile(sub.getParentFile(), sub.getName())); |
| } catch (IllegalArgumentException e) { |
| //Ignored the file did not match |
| LOG.warn("Found an unexpected file in {} {}",path, sub.getName()); |
| } |
| } |
| } |
| return ret.iterator(); |
| } |
| |
| protected Iterator<String> listKeys(File path) throws IOException { |
| String[] files = path.list(); |
| if (files != null) { |
| return Arrays.asList(files).iterator(); |
| } |
| return new LinkedList<String>().iterator(); |
| } |
| |
| protected void delete(File path) throws IOException { |
| if (Files.exists(path.toPath())){ |
| |
| Files.walkFileTree(path.toPath(), new SimpleFileVisitor<Path>() { |
| |
| @Override |
| public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { |
| Files.delete(file); |
| return FileVisitResult.CONTINUE; |
| } |
| |
| @Override |
| public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException { |
| Files.delete(dir); |
| return FileVisitResult.CONTINUE; |
| } |
| }); |
| } |
| } |
| |
| public void shutdown() { |
| if (cleanup != null) { |
| cleanup.cancel(); |
| cleanup = null; |
| } |
| } |
| } |