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Summary: This tool is for decompressing compressed image files, so we can check corruptions. For as long as we can get through the header: -layout -namespace id -numFiles -genstamp -txid (optional) syntactically, we should be able to decompress the rest. Also this tool is good for fixing image corruptions, better than customizing loading and saving code. Test Plan: manually, tested dfsdev image, decompressed and parsed with oiv Reviewers: hkuang, pritam, weiyan Reviewed By: hkuang
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tomasz
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Alex Feinberg
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Nov 8, 2012
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src/hdfs/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageDecompressor.java
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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.hadoop.hdfs.tools.offlineImageViewer; | ||
|
|
||
| import java.io.BufferedOutputStream; | ||
| import java.io.DataInputStream; | ||
| import java.io.DataOutputStream; | ||
| import java.io.EOFException; | ||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.FileOutputStream; | ||
| import java.io.IOException; | ||
|
|
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| import org.apache.commons.cli.CommandLine; | ||
| import org.apache.commons.cli.CommandLineParser; | ||
| import org.apache.commons.cli.OptionBuilder; | ||
| import org.apache.commons.cli.Options; | ||
| import org.apache.commons.cli.ParseException; | ||
| import org.apache.commons.cli.PosixParser; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.hdfs.protocol.LayoutVersion; | ||
| import org.apache.hadoop.hdfs.protocol.LayoutVersion.Feature; | ||
| import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.PositionTrackingInputStream; | ||
| import org.apache.hadoop.hdfs.server.namenode.FSImageCompression; | ||
|
|
||
| /** | ||
| * OfflineImageViewer to dump the contents of an Hadoop image file to XML or the | ||
| * console. Main entry point into utility, either via the command line or | ||
| * programatically. | ||
| */ | ||
| public class OfflineImageDecompressor { | ||
|
|
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| private final static String usage = "Usage: bin/hdfs oid -i INPUTFILE -o OUTPUTFILE\n" | ||
| + "Offline Image Decompressor\n" | ||
| + "The oid utility will attempt to decompress image files.\n" | ||
| + "The tool works offline and does not require a running cluster in\n" | ||
| + "order to process an image file.\n" | ||
| + "Required command line arguments:\n" | ||
| + "-i,--inputFile <arg> FSImage file to process.\n" | ||
| + "-o,--outputFile <arg> Name of output file. If the specified\n" | ||
| + " file exists, it will be overwritten.\n"; | ||
|
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| private final String inputFile; | ||
| private final String outputFile; | ||
| private int lastProgress = 0; | ||
|
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| public OfflineImageDecompressor(String inputFile, String outputFile) { | ||
| this.inputFile = inputFile; | ||
| this.outputFile = outputFile; | ||
| } | ||
|
|
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| /** | ||
| * Process image file. | ||
| */ | ||
| private void go() throws IOException { | ||
| long start = System.currentTimeMillis(); | ||
| System.out.println("Decompressing image file: " + inputFile + " to " | ||
| + outputFile); | ||
| DataInputStream in = null; | ||
| DataOutputStream out = null; | ||
|
|
||
| try { | ||
| // setup in | ||
| PositionTrackingInputStream ptis = new PositionTrackingInputStream( | ||
| new FileInputStream(new File(inputFile))); | ||
| in = new DataInputStream(ptis); | ||
|
|
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| // read header information | ||
| int imgVersion = in.readInt(); | ||
| if (!LayoutVersion.supports(Feature.FSIMAGE_COMPRESSION, imgVersion)) { | ||
| System.out | ||
| .println("Image is not compressed. No output will be produced."); | ||
| return; | ||
| } | ||
| int namespaceId = in.readInt(); | ||
| long numFiles = in.readLong(); | ||
| long genstamp = in.readLong(); | ||
|
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| long imgTxId = -1; | ||
| if (LayoutVersion.supports(Feature.STORED_TXIDS, imgVersion)) { | ||
| imgTxId = in.readLong(); | ||
| } | ||
| FSImageCompression compression = FSImageCompression | ||
| .readCompressionHeader(new Configuration(), in); | ||
| if (compression.isNoOpCompression()) { | ||
| System.out | ||
| .println("Image is not compressed. No output will be produced."); | ||
| return; | ||
| } | ||
| in = compression.unwrapInputStream(in); | ||
| System.out.println("Starting decompression."); | ||
|
|
||
| // setup output | ||
| out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream( | ||
| outputFile))); | ||
|
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| // write back the uncompressed information | ||
| out.writeInt(imgVersion); | ||
| out.writeInt(namespaceId); | ||
| out.writeLong(numFiles); | ||
| out.writeLong(genstamp); | ||
| if (LayoutVersion.supports(Feature.STORED_TXIDS, imgVersion)) { | ||
| out.writeLong(imgTxId); | ||
| } | ||
| // no compression | ||
| out.writeBoolean(false); | ||
|
|
||
| // copy the data | ||
| long size = new File(inputFile).length(); | ||
| // read in 1MB chunks | ||
| byte[] block = new byte[1024 * 1024]; | ||
| while (true) { | ||
| int bytesRead = in.read(block); | ||
| if (bytesRead <= 0) | ||
| break; | ||
| out.write(block, 0, bytesRead); | ||
| printProgress(ptis.getPos(), size); | ||
| } | ||
|
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| out.close(); | ||
|
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| long stop = System.currentTimeMillis(); | ||
| System.out.println("Input file : " + inputFile + " size: " + size); | ||
| System.out.println("Output file: " + outputFile + " size: " | ||
| + new File(outputFile).length()); | ||
| System.out.println("Decompression completed in " + (stop - start) | ||
| + " ms."); | ||
| } finally { | ||
| if (in != null) | ||
| in.close(); | ||
| if (out != null) | ||
| out.close(); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Print the progress. | ||
| */ | ||
| private void printProgress(long read, long size) { | ||
| int progress = Math.min(100, (int) ((100 * read) / size)); | ||
| if (progress > lastProgress) { | ||
| lastProgress = progress; | ||
| System.out.println("Completed " + lastProgress + " % "); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Build command-line options and descriptions | ||
| */ | ||
| public static Options buildOptions() { | ||
| Options options = new Options(); | ||
|
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| // Build in/output file arguments, which are required, but there is no | ||
| // addOption method that can specify this | ||
| OptionBuilder.isRequired(); | ||
| OptionBuilder.hasArgs(); | ||
| OptionBuilder.withLongOpt("outputFile"); | ||
| options.addOption(OptionBuilder.create("o")); | ||
|
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| OptionBuilder.isRequired(); | ||
| OptionBuilder.hasArgs(); | ||
| OptionBuilder.withLongOpt("inputFile"); | ||
| options.addOption(OptionBuilder.create("i")); | ||
|
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| options.addOption("h", "help", false, ""); | ||
| return options; | ||
| } | ||
|
|
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| /** | ||
| * Entry point to command-line-driven operation. User may specify options and | ||
| * start fsimage viewer from the command line. Program will process image file | ||
| * and exit cleanly or, if an error is encountered, inform user and exit. | ||
| * | ||
| * @param args | ||
| * Command line options | ||
| * @throws IOException | ||
| */ | ||
| public static void main(String[] args) throws IOException { | ||
| Options options = buildOptions(); | ||
| if (args.length == 0) { | ||
| printUsage(); | ||
| return; | ||
| } | ||
|
|
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| CommandLineParser parser = new PosixParser(); | ||
| CommandLine cmd; | ||
|
|
||
| try { | ||
| cmd = parser.parse(options, args); | ||
| } catch (ParseException e) { | ||
| System.out.println("Error parsing command-line options: "); | ||
| printUsage(); | ||
| return; | ||
| } | ||
|
|
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| if (cmd.hasOption("h")) { // print help and exit | ||
| printUsage(); | ||
| return; | ||
| } | ||
|
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| String inputFile = cmd.getOptionValue("i"); | ||
| String outputFile = cmd.getOptionValue("o"); | ||
|
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| try { | ||
| OfflineImageDecompressor d = new OfflineImageDecompressor(inputFile, | ||
| outputFile); | ||
| d.go(); | ||
| } catch (EOFException e) { | ||
| System.err.println("Input file ended unexpectedly. Exiting"); | ||
| } catch (IOException e) { | ||
| System.err.println("Encountered exception. Exiting: " + e.getMessage()); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Print application usage instructions. | ||
| */ | ||
| private static void printUsage() { | ||
| System.out.println(usage); | ||
| } | ||
| } |