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Posted to distributedlog-issues@bookkeeper.apache.org by GitBox <gi...@apache.org> on 2017/10/27 02:25:04 UTC
[GitHub] jiazhai commented on a change in pull request #227: DLFS - A FileSystem API wrapper over dlog API
jiazhai commented on a change in pull request #227: DLFS - A FileSystem API wrapper over dlog API
URL: https://github.com/apache/distributedlog/pull/227#discussion_r147311199
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File path: distributedlog-io/dlfs/src/main/java/org/apache/distributedlog/fs/DLFileSystem.java
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@@ -0,0 +1,330 @@
+/*
+ * 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.distributedlog.fs;
+
+import com.google.common.collect.Lists;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.URI;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Optional;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.configuration.ConfigurationException;
+import org.apache.distributedlog.DLSN;
+import org.apache.distributedlog.DistributedLogConfiguration;
+import org.apache.distributedlog.DistributedLogConstants;
+import org.apache.distributedlog.api.AsyncLogWriter;
+import org.apache.distributedlog.api.DistributedLogManager;
+import org.apache.distributedlog.api.LogReader;
+import org.apache.distributedlog.api.namespace.Namespace;
+import org.apache.distributedlog.api.namespace.NamespaceBuilder;
+import org.apache.distributedlog.exceptions.LogEmptyException;
+import org.apache.distributedlog.exceptions.LogNotFoundException;
+import org.apache.distributedlog.util.Utils;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.BufferedFSInputStream;
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FSDataOutputStream;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.permission.FsPermission;
+import org.apache.hadoop.util.Progressable;
+
+/**
+ * A FileSystem Implementation powered by replicated logs.
+ */
+@Slf4j
+public class DLFileSystem extends FileSystem {
+
+ //
+ // Settings
+ //
+
+ public static final String DLFS_CONF_FILE = "dlog.configuration.file";
+
+
+ private URI rootUri;
+ private Namespace namespace;
+ private final DistributedLogConfiguration dlConf;
+ private Path workingDir;
+
+ public DLFileSystem() {
+ this.dlConf = new DistributedLogConfiguration();
+ setWorkingDirectory(new Path(System.getProperty("user.dir", "")));
+ }
+
+ @Override
+ public URI getUri() {
+ return rootUri;
+ }
+
+ //
+ // Initialization
+ //
+
+ @Override
+ public void initialize(URI name, Configuration conf) throws IOException {
+ super.initialize(name, conf);
+ setConf(conf);
+
+ // initialize
+
+ this.rootUri = name;
+ // load the configuration
+ String dlConfLocation = conf.get(DLFS_CONF_FILE);
+ if (null != dlConfLocation) {
+ try {
+ this.dlConf.loadConf(new File(dlConfLocation).toURI().toURL());
+ log.info("Loaded the distributedlog configuration from {}", dlConfLocation);
+ } catch (ConfigurationException e) {
+ log.error("Failed to load the distributedlog configuration from " + dlConfLocation, e);
+ throw new IOException("Failed to load distributedlog configuration from " + dlConfLocation);
+ }
+ }
+ log.info("Initializing the filesystem at {}", name);
+ // initialize the namespace
+ this.namespace = NamespaceBuilder.newBuilder()
+ .clientId("dlfs-client-" + InetAddress.getLocalHost().getHostName())
+ .conf(dlConf)
+ .regionId(DistributedLogConstants.LOCAL_REGION_ID)
+ .uri(name)
+ .build();
+ log.info("Initialized the filesystem at {}", name);
+ }
+
+ @Override
+ public void close() throws IOException {
+ // clean up the resource
+ namespace.close();
+ super.close();
+ }
+
+ //
+ // Util Functions
+ //
+
+ private Path makeAbsolute(Path f) {
+ if (f.isAbsolute()) {
+ return f;
+ } else {
+ return new Path(workingDir, f);
+ }
+ }
+
+ private String getStreamName(Path relativePath) {
+ return makeAbsolute(relativePath).toUri().getPath().substring(1);
+ }
+
+ //
+ // Home & Working Directory
+ //
+
+ @Override
+ public Path getHomeDirectory() {
+ return this.makeQualified(new Path(System.getProperty("user.home", "")));
+ }
+
+ protected Path getInitialWorkingDirectory() {
+ return this.makeQualified(new Path(System.getProperty("user.dir", "")));
+ }
+
+ @Override
+ public void setWorkingDirectory(Path path) {
+ workingDir = makeAbsolute(path);
+ checkPath(workingDir);
+ }
+
+ @Override
+ public Path getWorkingDirectory() {
+ return workingDir;
+ }
+
+
+ @Override
+ public FSDataInputStream open(Path path, int bufferSize)
+ throws IOException {
+ try {
+ DistributedLogManager dlm = namespace.openLog(getStreamName(path));
+ LogReader reader;
+ try {
+ reader = dlm.openLogReader(DLSN.InitialDLSN);
+ } catch (LogNotFoundException lnfe) {
+ throw new FileNotFoundException(path.toString());
+ } catch (LogEmptyException lee) {
+ throw new FileNotFoundException(path.toString());
+ }
+ return new FSDataInputStream(
+ new BufferedFSInputStream(
+ new DLInputStream(dlm, reader, 0L),
+ bufferSize));
+ } catch (LogNotFoundException e) {
+ throw new FileNotFoundException(path.toString());
+ }
+ }
+
+ @Override
+ public FSDataOutputStream create(Path path,
+ FsPermission fsPermission,
+ boolean overwrite,
+ int bufferSize,
+ short replication,
+ long blockSize,
+ Progressable progressable) throws IOException {
+ // for overwrite, delete the existing file first.
+ if (overwrite) {
+ delete(path, false);
+ }
+
+ DistributedLogConfiguration confLocal = new DistributedLogConfiguration();
+ confLocal.addConfiguration(dlConf);
+ confLocal.setEnsembleSize(replication);
+ confLocal.setWriteQuorumSize(replication);
+ confLocal.setAckQuorumSize(replication);
+ confLocal.setMaxLogSegmentBytes(blockSize);
+ return append(path, bufferSize, Optional.of(confLocal));
+ }
+
+ @Override
+ public FSDataOutputStream append(Path path,
+ int bufferSize,
+ Progressable progressable) throws IOException {
+ return append(path, bufferSize, Optional.empty());
+ }
+
+ private FSDataOutputStream append(Path path,
+ int bufferSize,
+ Optional<DistributedLogConfiguration> confLocal)
+ throws IOException {
+ try {
+ DistributedLogManager dlm = namespace.openLog(
+ getStreamName(path),
+ confLocal,
+ Optional.empty(),
+ Optional.empty());
+ AsyncLogWriter writer = Utils.ioResult(dlm.openAsyncLogWriter());
+ return new FSDataOutputStream(
+ new BufferedOutputStream(
+ new DLOutputStream(dlm, writer), bufferSize
+ ),
+ statistics,
+ writer.getLastTxId() < 0L ? 0L : writer.getLastTxId());
+ } catch (LogNotFoundException le) {
+ throw new FileNotFoundException(path.toString());
+ }
+ }
+
+ @Override
+ public boolean delete(Path path, boolean recursive) throws IOException {
+ try {
+ String logName = getStreamName(path);
+ if (recursive) {
+ Iterator<String> logs = namespace.getLogs(logName);
+ while (logs.hasNext()) {
+ String child = logs.next();
+ Path childPath = new Path(path, child);
+ delete(childPath, recursive);
+ }
+ }
+ namespace.deleteLog(logName);
+ return true;
+ } catch (LogNotFoundException e) {
+ return true;
+ }
+ }
+
+ //
Review comment:
Maybe we could remove this? :)
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