HADOOP-6646. Move HarfileSystem out of Hadoop Common. (mahadev)
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@927193 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Mahadev Konar
parent
e381af1e1e
commit
980f819047
@ -202,6 +202,8 @@ Trunk (unreleased changes)
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HADOOP-6471. StringBuffer -> StringBuilder - conversion of references
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as necessary. (Kay Kay via tomwhite)
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HADOOP-6646. Move HarfileSystem out of Hadoop Common. (mahadev)
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OPTIMIZATIONS
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HADOOP-6467. Improve the performance on HarFileSystem.listStatus(..).
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@ -1,956 +0,0 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.fs;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URLDecoder;
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import java.util.ArrayList;
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import java.util.EnumSet;
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import java.util.List;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.permission.FsPermission;
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import org.apache.hadoop.io.Text;
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import org.apache.hadoop.util.LineReader;
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import org.apache.hadoop.util.Progressable;
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/**
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* This is an implementation of the Hadoop Archive
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* Filesystem. This archive Filesystem has index files
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* of the form _index* and has contents of the form
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* part-*. The index files store the indexes of the
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* real files. The index files are of the form _masterindex
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* and _index. The master index is a level of indirection
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* in to the index file to make the look ups faster. the index
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* file is sorted with hash code of the paths that it contains
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* and the master index contains pointers to the positions in
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* index for ranges of hashcodes.
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*/
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public class HarFileSystem extends FilterFileSystem {
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public static final int VERSION = 2;
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// uri representation of this Har filesystem
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private URI uri;
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// the version of this har filesystem
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private int version;
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// underlying uri
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private URI underLyingURI;
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// the top level path of the archive
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// in the underlying file system
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private Path archivePath;
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// the masterIndex of the archive
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private Path masterIndex;
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// the index file
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private Path archiveIndex;
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// the har auth
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private String harAuth;
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/**
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* public construction of harfilesystem
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*
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*/
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public HarFileSystem() {
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}
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/**
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* Constructor to create a HarFileSystem with an
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* underlying filesystem.
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* @param fs
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*/
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public HarFileSystem(FileSystem fs) {
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super(fs);
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}
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/**
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* Initialize a Har filesystem per har archive. The
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* archive home directory is the top level directory
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* in the filesystem that contains the HAR archive.
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* Be careful with this method, you do not want to go
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* on creating new Filesystem instances per call to
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* path.getFileSystem().
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* the uri of Har is
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* har://underlyingfsscheme-host:port/archivepath.
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* or
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* har:///archivepath. This assumes the underlying filesystem
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* to be used in case not specified.
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*/
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public void initialize(URI name, Configuration conf) throws IOException {
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//decode the name
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underLyingURI = decodeHarURI(name, conf);
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// we got the right har Path- now check if this is
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//truly a har filesystem
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Path harPath = archivePath(new Path(name.toString()));
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if (harPath == null) {
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throw new IOException("Invalid path for the Har Filesystem. " +
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name.toString());
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}
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if (fs == null) {
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fs = FileSystem.get(underLyingURI, conf);
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}
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this.uri = harPath.toUri();
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this.archivePath = new Path(this.uri.getPath());
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this.harAuth = getHarAuth(this.underLyingURI);
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//check for the underlying fs containing
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// the index file
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this.masterIndex = new Path(archivePath, "_masterindex");
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this.archiveIndex = new Path(archivePath, "_index");
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if (!fs.exists(masterIndex) || !fs.exists(archiveIndex)) {
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throw new IOException("Invalid path for the Har Filesystem. " +
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"No index file in " + harPath);
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}
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try{
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this.version = getHarVersion();
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} catch(IOException io) {
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throw new IOException("Unable to " +
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"read the version of the Har file system: " + this.archivePath);
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}
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// make it always backwards-compatible
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if (this.version > HarFileSystem.VERSION) {
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throw new IOException("Invalid version " +
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this.version + " expected " + HarFileSystem.VERSION);
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}
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}
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// get the version of the filesystem from the masterindex file
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// the version is currently not useful since its the first version
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// of archives
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public int getHarVersion() throws IOException {
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FSDataInputStream masterIn = fs.open(masterIndex);
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LineReader lmaster = new LineReader(masterIn, getConf());
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Text line = new Text();
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lmaster.readLine(line);
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try {
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masterIn.close();
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} catch(IOException e){
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//disregard it.
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// its a read.
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}
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String versionLine = line.toString();
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String[] arr = versionLine.split(" ");
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int version = Integer.parseInt(arr[0]);
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return version;
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}
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/*
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* find the parent path that is the
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* archive path in the path. The last
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* path segment that ends with .har is
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* the path that will be returned.
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*/
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private Path archivePath(Path p) {
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Path retPath = null;
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Path tmp = p;
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for (int i=0; i< p.depth(); i++) {
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if (tmp.toString().endsWith(".har")) {
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retPath = tmp;
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break;
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}
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tmp = tmp.getParent();
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}
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return retPath;
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}
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/**
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* decode the raw URI to get the underlying URI
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* @param rawURI raw Har URI
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* @return filtered URI of the underlying fileSystem
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*/
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private URI decodeHarURI(URI rawURI, Configuration conf) throws IOException {
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String tmpAuth = rawURI.getAuthority();
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//we are using the default file
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//system in the config
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//so create a underlying uri and
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//return it
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if (tmpAuth == null) {
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//create a path
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return FileSystem.getDefaultUri(conf);
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}
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String host = rawURI.getHost();
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if (host == null) {
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throw new IOException("URI: " + rawURI
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+ " is an invalid Har URI since host==null."
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+ " Expecting har://<scheme>-<host>/<path>.");
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}
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int i = host.indexOf('-');
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if (i < 0) {
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throw new IOException("URI: " + rawURI
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+ " is an invalid Har URI since '-' not found."
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+ " Expecting har://<scheme>-<host>/<path>.");
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}
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final String underLyingScheme = host.substring(0, i);
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i++;
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final String underLyingHost = i == host.length()? null: host.substring(i);
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int underLyingPort = rawURI.getPort();
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String auth = (underLyingHost == null && underLyingPort == -1)?
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null:(underLyingHost+":"+underLyingPort);
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URI tmp = null;
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if (rawURI.getQuery() != null) {
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// query component not allowed
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throw new IOException("query component in Path not supported " + rawURI);
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}
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try {
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tmp = new URI(underLyingScheme, auth, rawURI.getPath(),
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rawURI.getQuery(), rawURI.getFragment());
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} catch (URISyntaxException e) {
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// do nothing should not happen
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}
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return tmp;
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}
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private String decodeFileName(String fname)
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throws UnsupportedEncodingException {
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if (version == 2){
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return URLDecoder.decode(fname, "UTF-8");
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}
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return fname;
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}
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/**
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* return the top level archive.
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*/
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public Path getWorkingDirectory() {
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return new Path(uri.toString());
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}
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/**
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* Create a har specific auth
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* har-underlyingfs:port
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* @param underLyingURI the uri of underlying
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* filesystem
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* @return har specific auth
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*/
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private String getHarAuth(URI underLyingUri) {
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String auth = underLyingUri.getScheme() + "-";
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if (underLyingUri.getHost() != null) {
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auth += underLyingUri.getHost() + ":";
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if (underLyingUri.getPort() != -1) {
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auth += underLyingUri.getPort();
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}
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}
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else {
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auth += ":";
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}
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return auth;
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}
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/**
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* Returns the uri of this filesystem.
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* The uri is of the form
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* har://underlyingfsschema-host:port/pathintheunderlyingfs
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*/
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@Override
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public URI getUri() {
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return this.uri;
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}
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/**
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* this method returns the path
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* inside the har filesystem.
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* this is relative path inside
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* the har filesystem.
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* @param path the fully qualified path in the har filesystem.
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* @return relative path in the filesystem.
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*/
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private Path getPathInHar(Path path) {
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Path harPath = new Path(path.toUri().getPath());
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if (archivePath.compareTo(harPath) == 0)
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return new Path(Path.SEPARATOR);
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Path tmp = new Path(harPath.getName());
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Path parent = harPath.getParent();
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while (!(parent.compareTo(archivePath) == 0)) {
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if (parent.toString().equals(Path.SEPARATOR)) {
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tmp = null;
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break;
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}
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tmp = new Path(parent.getName(), tmp);
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parent = parent.getParent();
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}
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if (tmp != null)
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tmp = new Path(Path.SEPARATOR, tmp);
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return tmp;
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}
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//the relative path of p. basically
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// getting rid of /. Parsing and doing
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// string manipulation is not good - so
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// just use the path api to do it.
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private Path makeRelative(String initial, Path p) {
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Path root = new Path(Path.SEPARATOR);
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if (root.compareTo(p) == 0)
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return new Path(initial);
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Path retPath = new Path(p.getName());
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Path parent = p.getParent();
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for (int i=0; i < p.depth()-1; i++) {
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retPath = new Path(parent.getName(), retPath);
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parent = parent.getParent();
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}
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return new Path(initial, retPath.toString());
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}
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/* this makes a path qualified in the har filesystem
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* (non-Javadoc)
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* @see org.apache.hadoop.fs.FilterFileSystem#makeQualified(
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* org.apache.hadoop.fs.Path)
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*/
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@Override
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public Path makeQualified(Path path) {
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// make sure that we just get the
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// path component
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Path fsPath = path;
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if (!path.isAbsolute()) {
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fsPath = new Path(archivePath, path);
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}
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URI tmpURI = fsPath.toUri();
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//change this to Har uri
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return new Path(uri.getScheme(), harAuth, tmpURI.getPath());
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}
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/**
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* get block locations from the underlying fs
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* @param file the input filestatus to get block locations
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* @param start the start in the file
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* @param len the length in the file
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* @return block locations for this segment of file
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* @throws IOException
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*/
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@Override
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public BlockLocation[] getFileBlockLocations(FileStatus file, long start,
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long len) throws IOException {
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// just fake block locations
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// its fast and simpler
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// doing various block location manipulation
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// with part files adds a lot of overhead because
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// of the look ups of filestatus in index files
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return new BlockLocation[]{ new BlockLocation() };
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}
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/**
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* fake the rawblocks since map reduce uses the block offsets to
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* fo some computations regarding the blocks
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* @param rawBlocks the raw blocks returned by the filesystem
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* @return faked blocks with changed offsets.
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*/
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private BlockLocation[] fakeBlockLocations(BlockLocation[] rawBlocks,
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long startIndex) {
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for (BlockLocation block : rawBlocks) {
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long rawOffset = block.getOffset();
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block.setOffset(rawOffset - startIndex);
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}
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return rawBlocks;
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}
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/**
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* the hash of the path p inside iniside
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* the filesystem
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* @param p the path in the harfilesystem
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* @return the hash code of the path.
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*/
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public static int getHarHash(Path p) {
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return (p.toString().hashCode() & 0x7fffffff);
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}
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static class Store {
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public Store() {
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begin = end = startHash = endHash = 0;
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}
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public Store(long begin, long end, int startHash, int endHash) {
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this.begin = begin;
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this.end = end;
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this.startHash = startHash;
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this.endHash = endHash;
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}
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public long begin;
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public long end;
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public int startHash;
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public int endHash;
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}
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/**
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* Get filestatuses of all the children of a given directory. This just reads
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* through index file and reads line by line to get all statuses for children
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* of a directory. Its a brute force way of getting all such filestatuses
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*
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* @param parent
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* the parent path directory
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* @param statuses
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* the list to add the children filestatuses to
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* @param children
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* the string list of children for this parent
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* @param archiveIndexStat
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* the archive index filestatus
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*/
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private void fileStatusesInIndex(HarStatus parent, List<FileStatus> statuses,
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List<String> children, FileStatus archiveIndexStat) throws IOException {
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// read the index file
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FSDataInputStream aIn = null;
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try {
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aIn = fs.open(archiveIndex);
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LineReader aLin;
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long read = 0;
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aLin = new LineReader(aIn, getConf());
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String parentString = parent.getName();
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if (!parentString.endsWith(Path.SEPARATOR)){
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parentString += Path.SEPARATOR;
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}
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Path harPath = new Path(parentString);
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int harlen = harPath.depth();
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Text line = new Text();
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while (read < archiveIndexStat.getLen()) {
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int tmp = aLin.readLine(line);
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read += tmp;
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String lineFeed = line.toString();
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String child = decodeFileName(lineFeed.substring(0, lineFeed.indexOf(" ")));
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if ((child.startsWith(parentString))) {
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Path thisPath = new Path(child);
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if (thisPath.depth() == harlen + 1) {
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// bingo!
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HarStatus hstatus = new HarStatus(lineFeed);
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FileStatus childStatus = new FileStatus(hstatus.isDir() ? 0
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: hstatus.getLength(), hstatus.isDir(), (int) archiveIndexStat
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.getReplication(), archiveIndexStat.getBlockSize(),
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archiveIndexStat.getModificationTime(), archiveIndexStat
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.getAccessTime(), new FsPermission(archiveIndexStat
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.getPermission()), archiveIndexStat.getOwner(),
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archiveIndexStat.getGroup(), makeRelative(this.uri.toString(),
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new Path(hstatus.name)));
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statuses.add(childStatus);
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}
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line.clear();
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}
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}
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} finally {
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if (aIn != null) {
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aIn.close();
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}
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}
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}
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// make sure that this harPath is relative to the har filesystem
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// this only works for relative paths. This returns the line matching
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// the file in the index. Returns a null if there is not matching
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// filename in the index file.
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private String fileStatusInIndex(Path harPath) throws IOException {
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// read the index file
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int hashCode = getHarHash(harPath);
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// get the master index to find the pos
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// in the index file
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FSDataInputStream in = fs.open(masterIndex);
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FileStatus masterStat = fs.getFileStatus(masterIndex);
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LineReader lin = new LineReader(in, getConf());
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Text line = new Text();
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long read = lin.readLine(line);
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//ignore the first line. this is the header of the index files
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String[] readStr = null;
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List<Store> stores = new ArrayList<Store>();
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while(read < masterStat.getLen()) {
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int b = lin.readLine(line);
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read += b;
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readStr = line.toString().split(" ");
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int startHash = Integer.parseInt(readStr[0]);
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int endHash = Integer.parseInt(readStr[1]);
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if (startHash <= hashCode && hashCode <= endHash) {
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stores.add(new Store(Long.parseLong(readStr[2]),
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Long.parseLong(readStr[3]), startHash,
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endHash));
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}
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line.clear();
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}
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try {
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lin.close();
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} catch(IOException io){
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// do nothing just a read.
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}
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FSDataInputStream aIn = fs.open(archiveIndex);
|
||||
LineReader aLin;
|
||||
String retStr = null;
|
||||
// now start reading the real index file
|
||||
for (Store s: stores) {
|
||||
read = 0;
|
||||
aIn.seek(s.begin);
|
||||
aLin = new LineReader(aIn, getConf());
|
||||
while (read + s.begin < s.end) {
|
||||
int tmp = aLin.readLine(line);
|
||||
read += tmp;
|
||||
String lineFeed = line.toString();
|
||||
String[] parsed = lineFeed.split(" ");
|
||||
parsed[0] = decodeFileName(parsed[0]);
|
||||
if (harPath.compareTo(new Path(parsed[0])) == 0) {
|
||||
// bingo!
|
||||
retStr = lineFeed;
|
||||
break;
|
||||
}
|
||||
line.clear();
|
||||
}
|
||||
if (retStr != null)
|
||||
break;
|
||||
}
|
||||
try {
|
||||
aIn.close();
|
||||
} catch(IOException io) {
|
||||
//do nothing
|
||||
}
|
||||
return retStr;
|
||||
}
|
||||
|
||||
// a single line parser for hadoop archives status
|
||||
// stored in a single line in the index files
|
||||
// the format is of the form
|
||||
// filename "dir"/"file" partFileName startIndex length
|
||||
// <space seperated children>
|
||||
private class HarStatus {
|
||||
boolean isDir;
|
||||
String name;
|
||||
List<String> children;
|
||||
String partName;
|
||||
long startIndex;
|
||||
long length;
|
||||
public HarStatus(String harString) throws UnsupportedEncodingException {
|
||||
String[] splits = harString.split(" ");
|
||||
this.name = decodeFileName(splits[0]);
|
||||
this.isDir = "dir".equals(splits[1]) ? true: false;
|
||||
// this is equal to "none" if its a directory
|
||||
this.partName = splits[2];
|
||||
this.startIndex = Long.parseLong(splits[3]);
|
||||
this.length = Long.parseLong(splits[4]);
|
||||
if (isDir) {
|
||||
children = new ArrayList<String>();
|
||||
for (int i = 5; i < splits.length; i++) {
|
||||
children.add(decodeFileName(splits[i]));
|
||||
}
|
||||
}
|
||||
}
|
||||
public boolean isDir() {
|
||||
return isDir;
|
||||
}
|
||||
|
||||
public String getName() {
|
||||
return name;
|
||||
}
|
||||
|
||||
public List<String> getChildren() {
|
||||
return children;
|
||||
}
|
||||
public String getFileName() {
|
||||
return name;
|
||||
}
|
||||
public String getPartName() {
|
||||
return partName;
|
||||
}
|
||||
public long getStartIndex() {
|
||||
return startIndex;
|
||||
}
|
||||
public long getLength() {
|
||||
return length;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* return the filestatus of files in har archive.
|
||||
* The permission returned are that of the archive
|
||||
* index files. The permissions are not persisted
|
||||
* while creating a hadoop archive.
|
||||
* @param f the path in har filesystem
|
||||
* @return filestatus.
|
||||
* @throws IOException
|
||||
*/
|
||||
@Override
|
||||
public FileStatus getFileStatus(Path f) throws IOException {
|
||||
FileStatus archiveStatus = fs.getFileStatus(archiveIndex);
|
||||
// get the fs DataInputStream for the underlying file
|
||||
// look up the index.
|
||||
Path p = makeQualified(f);
|
||||
Path harPath = getPathInHar(p);
|
||||
if (harPath == null) {
|
||||
throw new IOException("Invalid file name: " + f + " in " + uri);
|
||||
}
|
||||
String readStr = fileStatusInIndex(harPath);
|
||||
if (readStr == null) {
|
||||
throw new FileNotFoundException("File: " + f + " does not exist in " + uri);
|
||||
}
|
||||
HarStatus hstatus = null;
|
||||
hstatus = new HarStatus(readStr);
|
||||
return new FileStatus(hstatus.isDir()?0:hstatus.getLength(), hstatus.isDir(),
|
||||
(int)archiveStatus.getReplication(), archiveStatus.getBlockSize(),
|
||||
archiveStatus.getModificationTime(), archiveStatus.getAccessTime(),
|
||||
new FsPermission(
|
||||
archiveStatus.getPermission()), archiveStatus.getOwner(),
|
||||
archiveStatus.getGroup(),
|
||||
makeRelative(this.uri.toString(), new Path(hstatus.name)));
|
||||
}
|
||||
|
||||
/**
|
||||
* @return null since no checksum algorithm is implemented.
|
||||
*/
|
||||
public FileChecksum getFileChecksum(Path f) {
|
||||
return null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a har input stream which fakes end of
|
||||
* file. It reads the index files to get the part
|
||||
* file name and the size and start of the file.
|
||||
*/
|
||||
@Override
|
||||
public FSDataInputStream open(Path f, int bufferSize) throws IOException {
|
||||
// get the fs DataInputStream for the underlying file
|
||||
// look up the index.
|
||||
Path p = makeQualified(f);
|
||||
Path harPath = getPathInHar(p);
|
||||
if (harPath == null) {
|
||||
throw new IOException("Invalid file name: " + f + " in " + uri);
|
||||
}
|
||||
String readStr = fileStatusInIndex(harPath);
|
||||
if (readStr == null) {
|
||||
throw new FileNotFoundException(f + ": not found in " + archivePath);
|
||||
}
|
||||
HarStatus hstatus = new HarStatus(readStr);
|
||||
// we got it.. woo hooo!!!
|
||||
if (hstatus.isDir()) {
|
||||
throw new FileNotFoundException(f + " : not a file in " +
|
||||
archivePath);
|
||||
}
|
||||
return new HarFSDataInputStream(fs, new Path(archivePath,
|
||||
hstatus.getPartName()),
|
||||
hstatus.getStartIndex(), hstatus.getLength(), bufferSize);
|
||||
}
|
||||
|
||||
/*
|
||||
* create throws an exception in Har filesystem.
|
||||
* The archive once created cannot be changed.
|
||||
*/
|
||||
public FSDataOutputStream create(Path f, int bufferSize)
|
||||
throws IOException {
|
||||
throw new IOException("Har: Create not allowed");
|
||||
}
|
||||
|
||||
public FSDataOutputStream create(Path f,
|
||||
FsPermission permission,
|
||||
EnumSet<CreateFlag> flag,
|
||||
int bufferSize,
|
||||
short replication,
|
||||
long blockSize,
|
||||
Progressable progress) throws IOException {
|
||||
throw new IOException("Har: create not allowed.");
|
||||
}
|
||||
|
||||
@Override
|
||||
public void close() throws IOException {
|
||||
if (fs != null) {
|
||||
try {
|
||||
fs.close();
|
||||
} catch(IOException ie) {
|
||||
//this might already be closed
|
||||
// ignore
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Not implemented.
|
||||
*/
|
||||
@Override
|
||||
public boolean setReplication(Path src, short replication) throws IOException{
|
||||
throw new IOException("Har: setreplication not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* Not implemented.
|
||||
*/
|
||||
@Override
|
||||
public boolean delete(Path f, boolean recursive) throws IOException {
|
||||
throw new IOException("Har: delete not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* liststatus returns the children of a directory
|
||||
* after looking up the index files.
|
||||
*/
|
||||
@Override
|
||||
public FileStatus[] listStatus(Path f) throws IOException {
|
||||
//need to see if the file is an index in file
|
||||
//get the filestatus of the archive directory
|
||||
// we will create fake filestatuses to return
|
||||
// to the client
|
||||
List<FileStatus> statuses = new ArrayList<FileStatus>();
|
||||
FileStatus archiveStatus = fs.getFileStatus(archiveIndex);
|
||||
Path tmpPath = makeQualified(f);
|
||||
Path harPath = getPathInHar(tmpPath);
|
||||
String readStr = fileStatusInIndex(harPath);
|
||||
if (readStr == null) {
|
||||
throw new FileNotFoundException("File " + f + " not found in " + archivePath);
|
||||
}
|
||||
HarStatus hstatus = new HarStatus(readStr);
|
||||
if (!hstatus.isDir())
|
||||
statuses.add(new FileStatus(hstatus.getLength(),
|
||||
hstatus.isDir(),
|
||||
archiveStatus.getReplication(), archiveStatus.getBlockSize(),
|
||||
archiveStatus.getModificationTime(), archiveStatus.getAccessTime(),
|
||||
new FsPermission(archiveStatus.getPermission()),
|
||||
archiveStatus.getOwner(), archiveStatus.getGroup(),
|
||||
makeRelative(this.uri.toString(), new Path(hstatus.name))));
|
||||
else
|
||||
fileStatusesInIndex(hstatus, statuses, hstatus.children, archiveStatus);
|
||||
|
||||
return statuses.toArray(new FileStatus[statuses.size()]);
|
||||
}
|
||||
|
||||
/**
|
||||
* return the top level archive path.
|
||||
*/
|
||||
public Path getHomeDirectory() {
|
||||
return new Path(uri.toString());
|
||||
}
|
||||
|
||||
public void setWorkingDirectory(Path newDir) {
|
||||
//does nothing.
|
||||
}
|
||||
|
||||
/**
|
||||
* not implemented.
|
||||
*/
|
||||
public boolean mkdirs(Path f, FsPermission permission) throws IOException {
|
||||
throw new IOException("Har: mkdirs not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* not implemented.
|
||||
*/
|
||||
public void copyFromLocalFile(boolean delSrc, Path src, Path dst) throws
|
||||
IOException {
|
||||
throw new IOException("Har: copyfromlocalfile not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* copies the file in the har filesystem to a local file.
|
||||
*/
|
||||
public void copyToLocalFile(boolean delSrc, Path src, Path dst)
|
||||
throws IOException {
|
||||
FileUtil.copy(this, src, getLocal(getConf()), dst, false, getConf());
|
||||
}
|
||||
|
||||
/**
|
||||
* not implemented.
|
||||
*/
|
||||
public Path startLocalOutput(Path fsOutputFile, Path tmpLocalFile)
|
||||
throws IOException {
|
||||
throw new IOException("Har: startLocalOutput not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* not implemented.
|
||||
*/
|
||||
public void completeLocalOutput(Path fsOutputFile, Path tmpLocalFile)
|
||||
throws IOException {
|
||||
throw new IOException("Har: completeLocalOutput not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* not implemented.
|
||||
*/
|
||||
public void setOwner(Path p, String username, String groupname)
|
||||
throws IOException {
|
||||
throw new IOException("Har: setowner not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* Not implemented.
|
||||
*/
|
||||
public void setPermission(Path p, FsPermission permisssion)
|
||||
throws IOException {
|
||||
throw new IOException("Har: setPermission not allowed");
|
||||
}
|
||||
|
||||
/**
|
||||
* Hadoop archives input stream. This input stream fakes EOF
|
||||
* since archive files are part of bigger part files.
|
||||
*/
|
||||
private static class HarFSDataInputStream extends FSDataInputStream {
|
||||
/**
|
||||
* Create an input stream that fakes all the reads/positions/seeking.
|
||||
*/
|
||||
private static class HarFsInputStream extends FSInputStream {
|
||||
private long position, start, end;
|
||||
//The underlying data input stream that the
|
||||
// underlying filesystem will return.
|
||||
private FSDataInputStream underLyingStream;
|
||||
//one byte buffer
|
||||
private byte[] oneBytebuff = new byte[1];
|
||||
HarFsInputStream(FileSystem fs, Path path, long start,
|
||||
long length, int bufferSize) throws IOException {
|
||||
underLyingStream = fs.open(path, bufferSize);
|
||||
underLyingStream.seek(start);
|
||||
// the start of this file in the part file
|
||||
this.start = start;
|
||||
// the position pointer in the part file
|
||||
this.position = start;
|
||||
// the end pointer in the part file
|
||||
this.end = start + length;
|
||||
}
|
||||
|
||||
public synchronized int available() throws IOException {
|
||||
long remaining = end - underLyingStream.getPos();
|
||||
if (remaining > (long)Integer.MAX_VALUE) {
|
||||
return Integer.MAX_VALUE;
|
||||
}
|
||||
return (int) remaining;
|
||||
}
|
||||
|
||||
public synchronized void close() throws IOException {
|
||||
underLyingStream.close();
|
||||
super.close();
|
||||
}
|
||||
|
||||
//not implemented
|
||||
@Override
|
||||
public void mark(int readLimit) {
|
||||
// do nothing
|
||||
}
|
||||
|
||||
/**
|
||||
* reset is not implemented
|
||||
*/
|
||||
public void reset() throws IOException {
|
||||
throw new IOException("reset not implemented.");
|
||||
}
|
||||
|
||||
public synchronized int read() throws IOException {
|
||||
int ret = read(oneBytebuff, 0, 1);
|
||||
return (ret <= 0) ? -1: (oneBytebuff[0] & 0xff);
|
||||
}
|
||||
|
||||
public synchronized int read(byte[] b) throws IOException {
|
||||
int ret = read(b, 0, b.length);
|
||||
if (ret != -1) {
|
||||
position += ret;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
*
|
||||
*/
|
||||
public synchronized int read(byte[] b, int offset, int len)
|
||||
throws IOException {
|
||||
int newlen = len;
|
||||
int ret = -1;
|
||||
if (position + len > end) {
|
||||
newlen = (int) (end - position);
|
||||
}
|
||||
// end case
|
||||
if (newlen == 0)
|
||||
return ret;
|
||||
ret = underLyingStream.read(b, offset, newlen);
|
||||
position += ret;
|
||||
return ret;
|
||||
}
|
||||
|
||||
public synchronized long skip(long n) throws IOException {
|
||||
long tmpN = n;
|
||||
if (tmpN > 0) {
|
||||
if (position + tmpN > end) {
|
||||
tmpN = end - position;
|
||||
}
|
||||
underLyingStream.seek(tmpN + position);
|
||||
position += tmpN;
|
||||
return tmpN;
|
||||
}
|
||||
return (tmpN < 0)? -1 : 0;
|
||||
}
|
||||
|
||||
public synchronized long getPos() throws IOException {
|
||||
return (position - start);
|
||||
}
|
||||
|
||||
public synchronized void seek(long pos) throws IOException {
|
||||
if (pos < 0 || (start + pos > end)) {
|
||||
throw new IOException("Failed to seek: EOF");
|
||||
}
|
||||
position = start + pos;
|
||||
underLyingStream.seek(position);
|
||||
}
|
||||
|
||||
public boolean seekToNewSource(long targetPos) throws IOException {
|
||||
//do not need to implement this
|
||||
// hdfs in itself does seektonewsource
|
||||
// while reading.
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* implementing position readable.
|
||||
*/
|
||||
public int read(long pos, byte[] b, int offset, int length)
|
||||
throws IOException {
|
||||
int nlength = length;
|
||||
if (start + nlength + pos > end) {
|
||||
nlength = (int) (end - (start + pos));
|
||||
}
|
||||
return underLyingStream.read(pos + start , b, offset, nlength);
|
||||
}
|
||||
|
||||
/**
|
||||
* position readable again.
|
||||
*/
|
||||
public void readFully(long pos, byte[] b, int offset, int length)
|
||||
throws IOException {
|
||||
if (start + length + pos > end) {
|
||||
throw new IOException("Not enough bytes to read.");
|
||||
}
|
||||
underLyingStream.readFully(pos + start, b, offset, length);
|
||||
}
|
||||
|
||||
public void readFully(long pos, byte[] b) throws IOException {
|
||||
readFully(pos, b, 0, b.length);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* constructors for har input stream.
|
||||
* @param fs the underlying filesystem
|
||||
* @param p The path in the underlying filesystem
|
||||
* @param start the start position in the part file
|
||||
* @param length the length of valid data in the part file
|
||||
* @param bufsize the buffer size
|
||||
* @throws IOException
|
||||
*/
|
||||
public HarFSDataInputStream(FileSystem fs, Path p, long start,
|
||||
long length, int bufsize) throws IOException {
|
||||
super(new HarFsInputStream(fs, p, start, length, bufsize));
|
||||
}
|
||||
|
||||
/**
|
||||
* constructor for har input stream.
|
||||
* @param fs the underlying filesystem
|
||||
* @param p the path in the underlying file system
|
||||
* @param start the start position in the part file
|
||||
* @param length the length of valid data in the part file.
|
||||
* @throws IOException
|
||||
*/
|
||||
public HarFSDataInputStream(FileSystem fs, Path p, long start, long length)
|
||||
throws IOException {
|
||||
super(new HarFsInputStream(fs, p, start, length, 0));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1,55 +0,0 @@
|
||||
/**
|
||||
* 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.fs;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.hadoop.conf.Configuration;
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
public class TestHarFileSystem {
|
||||
@Test
|
||||
public void testHarUri() {
|
||||
final Configuration conf = new Configuration();
|
||||
checkInvalidPath("har://hdfs-/foo.har", conf);
|
||||
checkInvalidPath("har://hdfs/foo.har", conf);
|
||||
checkInvalidPath("har://-hdfs/foo.har", conf);
|
||||
checkInvalidPath("har://-/foo.har", conf);
|
||||
}
|
||||
|
||||
static void checkInvalidPath(String s, Configuration conf) {
|
||||
System.out.println("\ncheckInvalidPath: " + s);
|
||||
final Path p = new Path(s);
|
||||
try {
|
||||
p.getFileSystem(conf);
|
||||
Assert.fail(p + " is an invalid path.");
|
||||
} catch (IOException e) {
|
||||
System.out.println("GOOD: Got an exception.");
|
||||
e.printStackTrace(System.out);
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testFileChecksum() {
|
||||
final Path p = new Path("har://file-localhost/foo.har/file1");
|
||||
final HarFileSystem harfs = new HarFileSystem();
|
||||
Assert.assertEquals(null, harfs.getFileChecksum(p));
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user