hadoop PBImageTextWriter 源码
haddop PBImageTextWriter 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/PBImageTextWriter.java
/**
* 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.BufferedInputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.XAttr;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockStoragePolicySuite;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf.SectionName;
import org.apache.hadoop.hdfs.server.namenode.FSImageUtil;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.FileSummary;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeId;
import org.apache.hadoop.hdfs.server.namenode.SerialNumberManager;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.io.WritableUtils;
import org.apache.hadoop.util.LimitInputStream;
import org.apache.hadoop.util.Lists;
import org.apache.hadoop.util.Time;
import org.fusesource.leveldbjni.JniDBFactory;
import org.iq80.leveldb.DB;
import org.iq80.leveldb.Options;
import org.iq80.leveldb.WriteBatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
import static org.apache.hadoop.hdfs.server.common.HdfsServerConstants.XATTR_ERASURECODING_POLICY;
/**
* This class reads the protobuf-based fsimage and generates text output
* for each inode to {@link PBImageTextWriter#out}. The sub-class can override
* {@link getEntry()} to generate formatted string for each inode.
*
* Since protobuf-based fsimage does not guarantee the order of inodes and
* directories, PBImageTextWriter runs two-phase scans:
*
* <ol>
* <li>The first phase, PBImageTextWriter scans the INode sections to reads the
* filename of each directory. It also scans the INode_Dir sections to loads
* the relationships between a directory and its children. It uses these metadata
* to build FS namespace and stored in {@link MetadataMap}</li>
* <li>The second phase, PBImageTextWriter re-scans the INode sections. For each
* inode, it looks up the path of the parent directory in the {@link MetadataMap},
* and generate output.</li>
* </ol>
*
* Two various of {@link MetadataMap} are provided. {@link InMemoryMetadataDB}
* stores all metadata in memory (O(n) memory) while
* {@link LevelDBMetadataMap} stores metadata in LevelDB on disk (O(1) memory).
* User can choose between them based on the time/space tradeoffs.
*/
abstract class PBImageTextWriter implements Closeable {
private static final Logger LOG =
LoggerFactory.getLogger(PBImageTextWriter.class);
static final String DEFAULT_DELIMITER = "\t";
static final String CRLF = StringUtils.CR + StringUtils.LF;
/**
* This metadata map is used to construct the namespace before generating
* text outputs.
*
* It contains two mapping relationships:
* <p>
* <li>It maps each inode (inode Id) to its parent directory (inode Id).</li>
* <li>It maps each directory from its inode Id.</li>
* </p>
*/
private static interface MetadataMap extends Closeable {
/**
* Associate an inode with its parent directory.
*/
public void putDirChild(long parentId, long childId) throws IOException;
/**
* Associate a directory with its inode Id.
*/
public void putDir(INode dir) throws IOException;
/** Get the full path of the parent directory for the given inode. */
public String getParentPath(long inode) throws IOException;
/** Synchronize metadata to persistent storage, if possible */
public void sync() throws IOException;
/** Returns the name of inode. */
String getName(long id) throws IOException;
/**
* Returns the id of the parent's inode, if mentioned in
* INodeDirectorySection, throws IgnoreSnapshotException otherwise.
*/
long getParentId(long id) throws IOException;
}
/**
* Maintain all the metadata in memory.
*/
private static class InMemoryMetadataDB implements MetadataMap {
/**
* Represent a directory in memory.
*/
private static class Dir {
private final long inode;
private Dir parent = null;
private String name;
private String path = null; // cached full path of the directory.
Dir(long inode, String name) {
this.inode = inode;
this.name = name;
}
private void setParent(Dir parent) {
Preconditions.checkState(this.parent == null);
this.parent = parent;
}
/**
* Returns the full path of this directory.
*/
String getPath() throws IgnoreSnapshotException {
if (this.parent == null) {
if (this.inode == INodeId.ROOT_INODE_ID) {
return "/";
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("Not root inode with id {} having no parent.", inode);
}
throw PBImageTextWriter.createIgnoredSnapshotException(inode);
}
}
if (this.path == null) {
this.path = new Path(parent.getPath(), name.isEmpty() ? "/" : name).
toString();
}
return this.path;
}
String getName() throws IgnoreSnapshotException {
return name;
}
long getId() {
return inode;
}
@Override
public boolean equals(Object o) {
return o instanceof Dir && inode == ((Dir) o).inode;
}
@Override
public int hashCode() {
return Long.valueOf(inode).hashCode();
}
}
/**
* If the Dir entry does not exist (i.e. the inode was not contained in
* INodeSection) we still create a Dir entry which throws exceptions
* for calls other than getId().
* We can make sure this way, the getId and getParentId calls will
* always succeed if we have the information.
*/
private static class CorruptedDir extends Dir {
CorruptedDir(long inode) {
super(inode, null);
}
@Override
String getPath() throws IgnoreSnapshotException {
throw PBImageTextWriter.createIgnoredSnapshotException(getId());
}
@Override
String getName() throws IgnoreSnapshotException {
throw PBImageTextWriter.createIgnoredSnapshotException(getId());
}
}
/** INode Id to Dir object mapping */
private Map<Long, Dir> dirMap = new HashMap<>();
/** Children to parent directory INode ID mapping. */
private Map<Long, Dir> dirChildMap = new HashMap<>();
InMemoryMetadataDB() {
}
@Override
public void close() throws IOException {
}
private Dir getOrCreateCorrupted(long id) {
Dir dir = dirMap.get(id);
if (dir == null) {
dir = new CorruptedDir(id);
dirMap.put(id, dir);
}
return dir;
}
@Override
public void putDirChild(long parentId, long childId) {
Dir parent = getOrCreateCorrupted(parentId);
Dir child = getOrCreateCorrupted(childId);
child.setParent(parent);
Preconditions.checkState(!dirChildMap.containsKey(childId));
dirChildMap.put(childId, parent);
}
@Override
public void putDir(INode p) {
Preconditions.checkState(!dirMap.containsKey(p.getId()));
Dir dir = new Dir(p.getId(), p.getName().toStringUtf8());
dirMap.put(p.getId(), dir);
}
@Override
public String getParentPath(long inode) throws IOException {
if (inode == INodeId.ROOT_INODE_ID) {
return "/";
}
Dir parent = dirChildMap.get(inode);
if (parent == null) {
// The inode is an INodeReference, which is generated from snapshot.
// For delimited oiv tool, no need to print out metadata in snapshots.
throw PBImageTextWriter.createIgnoredSnapshotException(inode);
}
return parent.getPath();
}
@Override
public void sync() {
}
@Override
public String getName(long id) throws IgnoreSnapshotException {
Dir dir = dirMap.get(id);
if (dir != null) {
return dir.getName();
}
throw PBImageTextWriter.createIgnoredSnapshotException(id);
}
@Override
public long getParentId(long id) throws IgnoreSnapshotException {
Dir parentDir = dirChildMap.get(id);
if (parentDir != null) {
return parentDir.getId();
}
throw PBImageTextWriter.createIgnoredSnapshotException(id);
}
}
/**
* A MetadataMap that stores metadata in LevelDB.
*/
private static class LevelDBMetadataMap implements MetadataMap {
/**
* Store metadata in LevelDB.
*/
private static class LevelDBStore implements Closeable {
private DB db = null;
private WriteBatch batch = null;
private int writeCount = 0;
private static final int BATCH_SIZE = 1024;
LevelDBStore(final File dbPath) throws IOException {
Options options = new Options();
options.createIfMissing(true);
options.errorIfExists(true);
db = JniDBFactory.factory.open(dbPath, options);
batch = db.createWriteBatch();
}
@Override
public void close() throws IOException {
if (batch != null) {
IOUtils.cleanupWithLogger(null, batch);
batch = null;
}
IOUtils.cleanupWithLogger(null, db);
db = null;
}
public void put(byte[] key, byte[] value) throws IOException {
batch.put(key, value);
writeCount++;
if (writeCount >= BATCH_SIZE) {
sync();
}
}
public byte[] get(byte[] key) throws IOException {
return db.get(key);
}
public void sync() throws IOException {
try {
db.write(batch);
} finally {
batch.close();
batch = null;
}
batch = db.createWriteBatch();
writeCount = 0;
}
}
/**
* A LRU cache for directory path strings.
*
* The key of this LRU cache is the inode of a directory.
*/
private static class DirPathCache extends LinkedHashMap<Long, String> {
private final static int CAPACITY = 16 * 1024;
DirPathCache() {
super(CAPACITY);
}
@Override
protected boolean removeEldestEntry(Map.Entry<Long, String> entry) {
return super.size() > CAPACITY;
}
}
/** Map the child inode to the parent directory inode. */
private LevelDBStore dirChildMap = null;
/** Directory entry map */
private LevelDBStore dirMap = null;
private DirPathCache dirPathCache = new DirPathCache();
LevelDBMetadataMap(String baseDir) throws IOException {
File dbDir = new File(baseDir);
if (dbDir.exists()) {
throw new IOException("Folder " + dbDir + " already exists! Delete " +
"manually or provide another (not existing) directory!");
}
if (!dbDir.mkdirs()) {
throw new IOException("Failed to mkdir on " + dbDir);
}
try {
dirChildMap = new LevelDBStore(new File(dbDir, "dirChildMap"));
dirMap = new LevelDBStore(new File(dbDir, "dirMap"));
} catch (IOException e) {
LOG.error("Failed to open LevelDBs", e);
IOUtils.cleanupWithLogger(null, this);
}
}
@Override
public void close() throws IOException {
IOUtils.cleanupWithLogger(null, dirChildMap, dirMap);
dirChildMap = null;
dirMap = null;
}
private static byte[] toBytes(long value) {
return ByteBuffer.allocate(8).putLong(value).array();
}
private static byte[] toBytes(String value)
throws UnsupportedEncodingException {
return value.getBytes("UTF-8");
}
private static long toLong(byte[] bytes) {
Preconditions.checkArgument(bytes.length == 8);
return ByteBuffer.wrap(bytes).getLong();
}
private static String toString(byte[] bytes) throws IOException {
try {
return new String(bytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new IOException(e);
}
}
@Override
public void putDirChild(long parentId, long childId) throws IOException {
dirChildMap.put(toBytes(childId), toBytes(parentId));
}
@Override
public void putDir(INode dir) throws IOException {
Preconditions.checkArgument(dir.hasDirectory(),
"INode %s (%s) is not a directory.", dir.getId(), dir.getName());
dirMap.put(toBytes(dir.getId()), toBytes(dir.getName().toStringUtf8()));
}
private long getFromDirChildMap(long inode) throws IOException {
byte[] bytes = dirChildMap.get(toBytes(inode));
if (bytes == null) {
// The inode is an INodeReference, which is generated from snapshot.
// For delimited oiv tool, no need to print out metadata in snapshots.
throw PBImageTextWriter.createIgnoredSnapshotException(inode);
}
if (bytes.length != 8) {
throw new IOException(
"bytes array length error. Actual length is " + bytes.length);
}
return toLong(bytes);
}
@Override
public String getParentPath(long inode) throws IOException {
if (inode == INodeId.ROOT_INODE_ID) {
return "/";
}
long parent = getFromDirChildMap(inode);
byte[] bytes = dirMap.get(toBytes(parent));
synchronized (this) {
if (!dirPathCache.containsKey(parent)) {
if (parent != INodeId.ROOT_INODE_ID && bytes == null) {
// The parent is an INodeReference, which is generated from snapshot.
// For delimited oiv tool, no need to print out metadata in snapshots.
throw PBImageTextWriter.createIgnoredSnapshotException(inode);
}
String parentName = toString(bytes);
String parentPath =
new Path(getParentPath(parent),
parentName.isEmpty() ? "/" : parentName).toString();
dirPathCache.put(parent, parentPath);
}
return dirPathCache.get(parent);
}
}
@Override
public void sync() throws IOException {
dirChildMap.sync();
dirMap.sync();
}
@Override
public String getName(long id) throws IOException {
byte[] bytes = dirMap.get(toBytes(id));
if (bytes != null) {
return toString(bytes);
}
throw PBImageTextWriter.createIgnoredSnapshotException(id);
}
@Override
public long getParentId(long id) throws IOException {
return getFromDirChildMap(id);
}
}
private SerialNumberManager.StringTable stringTable;
private final PrintStream out;
private MetadataMap metadataMap = null;
private String delimiter;
private File filename;
private int numThreads;
private String parallelOutputFile;
/**
* Construct a PB FsImage writer to generate text file.
* @param out the writer to output text information of fsimage.
* @param tempPath the path to store metadata. If it is empty, store metadata
* in memory instead.
*/
PBImageTextWriter(PrintStream out, String delimiter, String tempPath,
int numThreads, String parallelOutputFile) throws IOException {
this.out = out;
this.delimiter = delimiter;
if (tempPath.isEmpty()) {
metadataMap = new InMemoryMetadataDB();
} else {
metadataMap = new LevelDBMetadataMap(tempPath);
}
this.numThreads = numThreads;
this.parallelOutputFile = parallelOutputFile;
}
PBImageTextWriter(PrintStream out, String delimiter, String tempPath)
throws IOException {
this(out, delimiter, tempPath, 1, "-");
}
protected PrintStream serialOutStream() {
return out;
}
@Override
public void close() throws IOException {
out.flush();
IOUtils.cleanupWithLogger(null, metadataMap);
}
void append(StringBuffer buffer, int field) {
buffer.append(delimiter);
buffer.append(field);
}
void append(StringBuffer buffer, long field) {
buffer.append(delimiter);
buffer.append(field);
}
void append(StringBuffer buffer, String field) {
buffer.append(delimiter);
String escapedField = StringEscapeUtils.escapeCsv(field);
if (escapedField.contains(CRLF)) {
escapedField = escapedField.replace(CRLF, "%x0D%x0A");
} else if (escapedField.contains(StringUtils.LF)) {
escapedField = escapedField.replace(StringUtils.LF, "%x0A");
}
buffer.append(escapedField);
}
/**
* Get text output for the given inode.
* @param parent the path of parent directory
* @param inode the INode object to output.
*/
abstract protected String getEntry(String parent, INode inode);
/**
* Get text output for the header line.
*/
abstract protected String getHeader();
/**
* Method called at the end of output() phase after all the inodes
* with known parentPath has been printed out. Can be used to print
* additional data depending on the written inodes.
*/
abstract protected void afterOutput() throws IOException;
public void visit(String filePath) throws IOException {
filename = new File(filePath);
RandomAccessFile file = new RandomAccessFile(filePath, "r");
Configuration conf = new Configuration();
if (!FSImageUtil.checkFileFormat(file)) {
throw new IOException("Unrecognized FSImage");
}
FileSummary summary = FSImageUtil.loadSummary(file);
try (FileInputStream fin = new FileInputStream(file.getFD())) {
InputStream is;
ArrayList<FileSummary.Section> sections =
Lists.newArrayList(summary.getSectionsList());
Collections.sort(sections,
new Comparator<FileSummary.Section>() {
@Override
public int compare(FsImageProto.FileSummary.Section s1,
FsImageProto.FileSummary.Section s2) {
FSImageFormatProtobuf.SectionName n1 =
FSImageFormatProtobuf.SectionName.fromString(s1.getName());
FSImageFormatProtobuf.SectionName n2 =
FSImageFormatProtobuf.SectionName.fromString(s2.getName());
if (n1 == null) {
return n2 == null ? 0 : -1;
} else if (n2 == null) {
return -1;
} else {
return n1.ordinal() - n2.ordinal();
}
}
});
ImmutableList<Long> refIdList = null;
for (FileSummary.Section section : sections) {
fin.getChannel().position(section.getOffset());
is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(new LimitInputStream(
fin, section.getLength())));
SectionName sectionName = SectionName.fromString(section.getName());
if (sectionName == null) {
throw new IOException("Unrecognized section " + section.getName());
}
switch (sectionName) {
case STRING_TABLE:
LOG.info("Loading string table");
stringTable = FSImageLoader.loadStringTable(is);
break;
case INODE_REFERENCE:
// Load INodeReference so that all INodes can be processed.
// Snapshots are not handled and will just be ignored for now.
LOG.info("Loading inode references");
refIdList = FSImageLoader.loadINodeReferenceSection(is);
break;
default:
break;
}
}
loadDirectories(fin, sections, summary, conf);
loadINodeDirSection(fin, sections, summary, conf, refIdList);
metadataMap.sync();
output(conf, summary, fin, sections);
}
}
void putDirChildToMetadataMap(long parentId, long childId)
throws IOException {
metadataMap.putDirChild(parentId, childId);
}
String getNodeName(long id) throws IOException {
return metadataMap.getName(id);
}
long getParentId(long id) throws IOException {
return metadataMap.getParentId(id);
}
private void output(Configuration conf, FileSummary summary,
FileInputStream fin, ArrayList<FileSummary.Section> sections)
throws IOException {
ArrayList<FileSummary.Section> allINodeSubSections =
getINodeSubSections(sections);
if (numThreads > 1 && !parallelOutputFile.equals("-") &&
allINodeSubSections.size() > 1) {
outputInParallel(conf, summary, allINodeSubSections);
} else {
LOG.info("Serial output due to threads num: {}, parallel output file: {}, " +
"subSections: {}.", numThreads, parallelOutputFile, allINodeSubSections.size());
outputInSerial(conf, summary, fin, sections);
}
}
private void outputInSerial(Configuration conf, FileSummary summary,
FileInputStream fin, ArrayList<FileSummary.Section> sections)
throws IOException {
InputStream is;
long startTime = Time.monotonicNow();
serialOutStream().println(getHeader());
for (FileSummary.Section section : sections) {
if (SectionName.fromString(section.getName()) == SectionName.INODE) {
fin.getChannel().position(section.getOffset());
is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(new LimitInputStream(
fin, section.getLength())));
INodeSection s = INodeSection.parseDelimitedFrom(is);
LOG.info("Found {} INodes in the INode section", s.getNumInodes());
int count = outputINodes(is, serialOutStream());
LOG.info("Outputted {} INodes.", count);
}
}
afterOutput();
long timeTaken = Time.monotonicNow() - startTime;
LOG.debug("Time to output inodes: {} ms", timeTaken);
}
/**
* STEP1: Multi-threaded process sub-sections.
* Given n (n>1) threads to process k (k>=n) sections,
* output parsed results of each section to tmp file in order.
* STEP2: Merge tmp files.
*/
private void outputInParallel(Configuration conf, FileSummary summary,
ArrayList<FileSummary.Section> subSections)
throws IOException {
int nThreads = Integer.min(numThreads, subSections.size());
LOG.info("Outputting in parallel with {} sub-sections using {} threads",
subSections.size(), nThreads);
final CopyOnWriteArrayList<IOException> exceptions = new CopyOnWriteArrayList<>();
CountDownLatch latch = new CountDownLatch(subSections.size());
ExecutorService executorService = Executors.newFixedThreadPool(nThreads);
AtomicLong expectedINodes = new AtomicLong(0);
AtomicLong totalParsed = new AtomicLong(0);
String codec = summary.getCodec();
String[] paths = new String[subSections.size()];
for (int i = 0; i < subSections.size(); i++) {
paths[i] = parallelOutputFile + ".tmp." + i;
int index = i;
executorService.submit(() -> {
LOG.info("Output iNodes of section-{}", index);
InputStream is = null;
try (PrintStream outStream = new PrintStream(paths[index], "UTF-8")) {
long startTime = Time.monotonicNow();
is = getInputStreamForSection(subSections.get(index), codec, conf);
if (index == 0) {
// The first iNode section has a header which must be processed first
INodeSection s = INodeSection.parseDelimitedFrom(is);
expectedINodes.set(s.getNumInodes());
}
totalParsed.addAndGet(outputINodes(is, outStream));
long timeTaken = Time.monotonicNow() - startTime;
LOG.info("Time to output iNodes of section-{}: {} ms", index, timeTaken);
} catch (Exception e) {
exceptions.add(new IOException(e));
} finally {
latch.countDown();
try {
if (is != null) {
is.close();
}
} catch (IOException ioe) {
LOG.warn("Failed to close the input stream, ignoring", ioe);
}
}
});
}
try {
latch.await();
} catch (InterruptedException e) {
LOG.error("Interrupted waiting for countdown latch", e);
throw new IOException(e);
}
executorService.shutdown();
if (exceptions.size() != 0) {
LOG.error("Failed to output INode sub-sections, {} exception(s) occurred.",
exceptions.size());
throw exceptions.get(0);
}
if (totalParsed.get() != expectedINodes.get()) {
throw new IOException("Expected to parse " + expectedINodes + " in parallel, " +
"but parsed " + totalParsed.get() + ". The image may be corrupt.");
}
LOG.info("Completed outputting all INode sub-sections to {} tmp files.",
subSections.size());
try (PrintStream ps = new PrintStream(parallelOutputFile, "UTF-8")) {
ps.println(getHeader());
}
// merge tmp files
long startTime = Time.monotonicNow();
mergeFiles(paths, parallelOutputFile);
long timeTaken = Time.monotonicNow() - startTime;
LOG.info("Completed all stages. Time to merge files: {} ms", timeTaken);
}
protected PermissionStatus getPermission(long perm) {
return FSImageFormatPBINode.Loader.loadPermission(perm, stringTable);
}
/** Load the directories in the INode section. */
private void loadDirectories(
FileInputStream fin, List<FileSummary.Section> sections,
FileSummary summary, Configuration conf)
throws IOException {
LOG.info("Loading directories");
long startTime = Time.monotonicNow();
for (FileSummary.Section section : sections) {
if (SectionName.fromString(section.getName())
== SectionName.INODE) {
fin.getChannel().position(section.getOffset());
InputStream is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(new LimitInputStream(
fin, section.getLength())));
loadDirectoriesInINodeSection(is);
}
}
long timeTaken = Time.monotonicNow() - startTime;
LOG.info("Finished loading directories in {}ms", timeTaken);
}
private void loadINodeDirSection(
FileInputStream fin, List<FileSummary.Section> sections,
FileSummary summary, Configuration conf, List<Long> refIdList)
throws IOException {
LOG.info("Loading INode directory section.");
long startTime = Time.monotonicNow();
for (FileSummary.Section section : sections) {
if (SectionName.fromString(section.getName())
== SectionName.INODE_DIR) {
fin.getChannel().position(section.getOffset());
InputStream is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(
new LimitInputStream(fin, section.getLength())));
buildNamespace(is, refIdList);
}
}
long timeTaken = Time.monotonicNow() - startTime;
LOG.info("Finished loading INode directory section in {}ms", timeTaken);
}
/**
* Checks the inode (saves if directory), and counts them. Can be overridden
* if additional steps are taken when iterating through INodeSection.
*/
protected void checkNode(INode p, AtomicInteger numDirs) throws IOException {
if (p.hasDirectory()) {
metadataMap.putDir(p);
numDirs.incrementAndGet();
}
}
/**
* Load the filenames of the directories from the INode section.
*/
private void loadDirectoriesInINodeSection(InputStream in)
throws IOException {
INodeSection s = INodeSection.parseDelimitedFrom(in);
LOG.info("Loading directories in INode section.");
AtomicInteger numDirs = new AtomicInteger(0);
for (int i = 0; i < s.getNumInodes(); ++i) {
INode p = INode.parseDelimitedFrom(in);
if (LOG.isDebugEnabled() && i % 10000 == 0) {
LOG.debug("Scanned {} inodes.", i);
}
checkNode(p, numDirs);
}
LOG.info("Found {} directories in INode section.", numDirs);
}
/**
* Scan the INodeDirectory section to construct the namespace.
*/
protected void buildNamespace(InputStream in, List<Long> refIdList)
throws IOException {
int count = 0;
while (true) {
FsImageProto.INodeDirectorySection.DirEntry e =
FsImageProto.INodeDirectorySection.DirEntry.parseDelimitedFrom(in);
if (e == null) {
break;
}
count++;
if (LOG.isDebugEnabled() && count % 10000 == 0) {
LOG.debug("Scanned {} directories.", count);
}
long parentId = e.getParent();
for (int i = 0; i < e.getChildrenCount(); i++) {
long childId = e.getChildren(i);
metadataMap.putDirChild(parentId, childId);
}
for (int i = e.getChildrenCount();
i < e.getChildrenCount() + e.getRefChildrenCount(); i++) {
int refId = e.getRefChildren(i - e.getChildrenCount());
metadataMap.putDirChild(parentId, refIdList.get(refId));
}
}
LOG.info("Scanned {} INode directories to build namespace.", count);
}
void printIfNotEmpty(PrintStream outStream, String line) {
if (!line.isEmpty()) {
outStream.println(line);
}
}
private int outputINodes(InputStream in, PrintStream outStream)
throws IOException {
long ignored = 0;
long ignoredSnapshots = 0;
// As the input stream is a LimitInputStream, the reading will stop when
// EOF is encountered at the end of the stream.
int count = 0;
while (true) {
INode p = INode.parseDelimitedFrom(in);
if (p == null) {
break;
}
try {
String parentPath = metadataMap.getParentPath(p.getId());
printIfNotEmpty(outStream, getEntry(parentPath, p));
} catch (IOException ioe) {
ignored++;
if (!(ioe instanceof IgnoreSnapshotException)) {
LOG.warn("Exception caught, ignoring node:{}", p.getId(), ioe);
} else {
ignoredSnapshots++;
if (LOG.isDebugEnabled()) {
LOG.debug("Exception caught, ignoring node:{}.", p.getId(), ioe);
}
}
}
count++;
if (LOG.isDebugEnabled() && count % 100000 == 0) {
LOG.debug("Outputted {} INodes.", count);
}
}
if (ignored > 0) {
LOG.warn("Ignored {} nodes, including {} in snapshots. Please turn on"
+ " debug log for details", ignored, ignoredSnapshots);
}
return count;
}
private static IgnoreSnapshotException createIgnoredSnapshotException(
long inode) {
// Ignore snapshots - we want the output similar to -ls -R.
if (LOG.isDebugEnabled()) {
LOG.debug("No snapshot name found for inode {}", inode);
}
return new IgnoreSnapshotException();
}
public int getStoragePolicy(
INodeSection.XAttrFeatureProto xattrFeatureProto) {
List<XAttr> xattrs =
FSImageFormatPBINode.Loader.loadXAttrs(xattrFeatureProto, stringTable);
for (XAttr xattr : xattrs) {
if (BlockStoragePolicySuite.isStoragePolicyXAttr(xattr)) {
return xattr.getValue()[0];
}
}
return HdfsConstants.BLOCK_STORAGE_POLICY_ID_UNSPECIFIED;
}
private ArrayList<FileSummary.Section> getINodeSubSections(
ArrayList<FileSummary.Section> sections) {
ArrayList<FileSummary.Section> subSections = new ArrayList<>();
Iterator<FileSummary.Section> iter = sections.iterator();
while (iter.hasNext()) {
FileSummary.Section s = iter.next();
if (SectionName.fromString(s.getName()) == SectionName.INODE_SUB) {
subSections.add(s);
}
}
return subSections;
}
/**
* Given a FSImage FileSummary.section, return a LimitInput stream set to
* the starting position of the section and limited to the section length.
* @param section The FileSummary.Section containing the offset and length
* @param compressionCodec The compression codec in use, if any
* @return An InputStream for the given section
* @throws IOException
*/
private InputStream getInputStreamForSection(FileSummary.Section section,
String compressionCodec, Configuration conf)
throws IOException {
// channel of RandomAccessFile is not thread safe, use File
FileInputStream fin = new FileInputStream(filename);
try {
FileChannel channel = fin.getChannel();
channel.position(section.getOffset());
InputStream in = new BufferedInputStream(new LimitInputStream(fin,
section.getLength()));
in = FSImageUtil.wrapInputStreamForCompression(conf,
compressionCodec, in);
return in;
} catch (IOException e) {
fin.close();
throw e;
}
}
/**
* @param srcPaths Source files of contents to be merged
* @param resultPath Merged file path
* @throws IOException
*/
public static void mergeFiles(String[] srcPaths, String resultPath)
throws IOException {
if (srcPaths == null || srcPaths.length < 1) {
LOG.warn("no source files to merge.");
return;
}
File[] files = new File[srcPaths.length];
for (int i = 0; i < srcPaths.length; i++) {
files[i] = new File(srcPaths[i]);
}
File resultFile = new File(resultPath);
try (FileChannel resultChannel =
new FileOutputStream(resultFile, true).getChannel()) {
for (File file : files) {
try (FileChannel src = new FileInputStream(file).getChannel()) {
resultChannel.transferFrom(src, resultChannel.size(), src.size());
}
}
}
for (File file : files) {
if (!file.delete() && file.exists()) {
LOG.warn("delete tmp file: {} returned false", file);
}
}
}
public String getErasureCodingPolicyName
(INodeSection.XAttrFeatureProto xattrFeatureProto) {
List<XAttr> xattrs =
FSImageFormatPBINode.Loader.loadXAttrs(xattrFeatureProto, stringTable);
for (XAttr xattr : xattrs) {
if (XATTR_ERASURECODING_POLICY.contains(xattr.getName())){
try{
ByteArrayInputStream bIn = new ByteArrayInputStream(xattr.getValue());
DataInputStream dIn = new DataInputStream(bIn);
return WritableUtils.readString(dIn);
} catch (IOException ioException){
return null;
}
}
}
return null;
}
}
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