hadoop FSImageFormatPBSnapshot 源码
haddop FSImageFormatPBSnapshot 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FSImageFormatPBSnapshot.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.server.namenode.snapshot;
import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.Loader.loadINodeDirectory;
import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.Loader.loadPermission;
import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.Loader.updateBlocksMap;
import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.Saver.buildINodeDirectory;
import static org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode.Saver.buildINodeFile;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockTypeProto;
import org.apache.hadoop.hdfs.protocolPB.PBHelperClient;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoContiguous;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.hdfs.server.namenode.AclEntryStatusFormat;
import org.apache.hadoop.hdfs.server.namenode.AclFeature;
import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
import org.apache.hadoop.hdfs.server.namenode.FSImage;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf.LoaderContext;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf.SectionName;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.FileSummary;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeReferenceSection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.SnapshotDiffSection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.SnapshotDiffSection.CreatedListEntry;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.SnapshotDiffSection.DiffEntry.Type;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.SnapshotSection;
import org.apache.hadoop.hdfs.server.namenode.INode;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectory;
import org.apache.hadoop.hdfs.server.namenode.INodeDirectoryAttributes;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;
import org.apache.hadoop.hdfs.server.namenode.INodeFileAttributes;
import org.apache.hadoop.hdfs.server.namenode.INodeMap;
import org.apache.hadoop.hdfs.server.namenode.INodeReference;
import org.apache.hadoop.hdfs.server.namenode.INodeReference.DstReference;
import org.apache.hadoop.hdfs.server.namenode.INodeReference.WithCount;
import org.apache.hadoop.hdfs.server.namenode.INodeReference.WithName;
import org.apache.hadoop.hdfs.server.namenode.INodeWithAdditionalFields;
import org.apache.hadoop.hdfs.server.namenode.QuotaByStorageTypeEntry;
import org.apache.hadoop.hdfs.server.namenode.SaveNamespaceContext;
import org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.DirectoryDiff;
import org.apache.hadoop.hdfs.server.namenode.snapshot.DirectoryWithSnapshotFeature.DirectoryDiffList;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot.Root;
import org.apache.hadoop.hdfs.server.namenode.XAttrFeature;
import org.apache.hadoop.hdfs.util.EnumCounters;
import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.thirdparty.protobuf.ByteString;
@InterfaceAudience.Private
public class FSImageFormatPBSnapshot {
/**
* Loading snapshot related information from protobuf based FSImage
*/
public final static class Loader {
private final FSNamesystem fsn;
private final FSDirectory fsDir;
private final FSImageFormatProtobuf.Loader parent;
private final Map<Integer, Snapshot> snapshotMap;
public Loader(FSNamesystem fsn, FSImageFormatProtobuf.Loader parent) {
this.fsn = fsn;
this.fsDir = fsn.getFSDirectory();
this.snapshotMap = new HashMap<Integer, Snapshot>();
this.parent = parent;
}
/**
* The sequence of the ref node in refList must be strictly the same with
* the sequence in fsimage
*/
public void loadINodeReferenceSection(InputStream in) throws IOException {
final List<INodeReference> refList = parent.getLoaderContext()
.getRefList();
while (true) {
INodeReferenceSection.INodeReference e = INodeReferenceSection
.INodeReference.parseDelimitedFrom(in);
if (e == null) {
break;
}
INodeReference ref = loadINodeReference(e);
refList.add(ref);
}
}
private INodeReference loadINodeReference(
INodeReferenceSection.INodeReference r) {
long referredId = r.getReferredId();
INode referred = fsDir.getInode(referredId);
WithCount withCount = (WithCount) referred.getParentReference();
if (withCount == null) {
withCount = new INodeReference.WithCount(null, referred);
}
final INodeReference ref;
if (r.hasDstSnapshotId()) { // DstReference
ref = new INodeReference.DstReference(null, withCount,
r.getDstSnapshotId());
} else {
ref = new INodeReference.WithName(null, withCount, r.getName()
.toByteArray(), r.getLastSnapshotId());
}
return ref;
}
/**
* Load the snapshots section from fsimage. Also add snapshottable feature
* to snapshottable directories.
*/
public void loadSnapshotSection(InputStream in) throws IOException {
SnapshotManager sm = fsn.getSnapshotManager();
SnapshotSection section = SnapshotSection.parseDelimitedFrom(in);
int snum = section.getNumSnapshots();
sm.setNumSnapshots(snum);
sm.setSnapshotCounter(section.getSnapshotCounter());
for (long sdirId : section.getSnapshottableDirList()) {
INodeDirectory dir = fsDir.getInode(sdirId).asDirectory();
if (!dir.isSnapshottable()) {
dir.addSnapshottableFeature();
} else {
// dir is root, and admin set root to snapshottable before
dir.setSnapshotQuota(
DirectorySnapshottableFeature.SNAPSHOT_QUOTA_DEFAULT);
}
sm.addSnapshottable(dir);
}
loadSnapshots(in, snum);
}
private void loadSnapshots(InputStream in, int size) throws IOException {
for (int i = 0; i < size; i++) {
SnapshotSection.Snapshot pbs = SnapshotSection.Snapshot
.parseDelimitedFrom(in);
INodeDirectory root = loadINodeDirectory(pbs.getRoot(),
parent.getLoaderContext());
int sid = pbs.getSnapshotId();
INodeDirectory parent = fsDir.getInode(root.getId()).asDirectory();
Snapshot snapshot = new Snapshot(sid, root, parent);
// add the snapshot to parent, since we follow the sequence of
// snapshotsByNames when saving, we do not need to sort when loading
parent.getDirectorySnapshottableFeature().addSnapshot(snapshot);
snapshotMap.put(sid, snapshot);
}
}
/**
* Load the snapshot diff section from fsimage.
*/
public void loadSnapshotDiffSection(InputStream in) throws IOException {
final List<INodeReference> refList = parent.getLoaderContext()
.getRefList();
while (true) {
SnapshotDiffSection.DiffEntry entry = SnapshotDiffSection.DiffEntry
.parseDelimitedFrom(in);
if (entry == null) {
break;
}
long inodeId = entry.getInodeId();
INode inode = fsDir.getInode(inodeId);
SnapshotDiffSection.DiffEntry.Type type = entry.getType();
switch (type) {
case FILEDIFF:
loadFileDiffList(in, inode.asFile(), entry.getNumOfDiff());
break;
case DIRECTORYDIFF:
loadDirectoryDiffList(in, inode.asDirectory(), entry.getNumOfDiff(),
refList);
break;
}
}
}
/** Load FileDiff list for a file with snapshot feature */
private void loadFileDiffList(InputStream in, INodeFile file, int size)
throws IOException {
final FileDiffList diffs = new FileDiffList();
final LoaderContext state = parent.getLoaderContext();
final BlockManager bm = fsn.getBlockManager();
for (int i = 0; i < size; i++) {
SnapshotDiffSection.FileDiff pbf = SnapshotDiffSection.FileDiff
.parseDelimitedFrom(in);
INodeFileAttributes copy = null;
if (pbf.hasSnapshotCopy()) {
INodeSection.INodeFile fileInPb = pbf.getSnapshotCopy();
PermissionStatus permission = loadPermission(
fileInPb.getPermission(), state.getStringTable());
AclFeature acl = null;
if (fileInPb.hasAcl()) {
int[] entries = AclEntryStatusFormat
.toInt(FSImageFormatPBINode.Loader.loadAclEntries(
fileInPb.getAcl(), state.getStringTable()));
acl = new AclFeature(entries);
}
XAttrFeature xAttrs = null;
if (fileInPb.hasXAttrs()) {
xAttrs = new XAttrFeature(FSImageFormatPBINode.Loader.loadXAttrs(
fileInPb.getXAttrs(), state.getStringTable()));
}
boolean isStriped =
(fileInPb.getBlockType() == BlockTypeProto .STRIPED);
Short replication =
(!isStriped ? (short)fileInPb.getReplication() : null);
Byte ecPolicyID =
(isStriped ? (byte)fileInPb.getErasureCodingPolicyID() : null);
copy = new INodeFileAttributes.SnapshotCopy(pbf.getName()
.toByteArray(), permission, acl, fileInPb.getModificationTime(),
fileInPb.getAccessTime(), replication, ecPolicyID,
fileInPb.getPreferredBlockSize(),
(byte)fileInPb.getStoragePolicyID(), xAttrs,
PBHelperClient.convert(fileInPb.getBlockType()));
}
FileDiff diff = new FileDiff(pbf.getSnapshotId(), copy, null,
pbf.getFileSize());
List<BlockProto> bpl = pbf.getBlocksList();
// in file diff there can only be contiguous blocks
BlockInfo[] blocks = new BlockInfo[bpl.size()];
for(int j = 0, e = bpl.size(); j < e; ++j) {
Block blk = PBHelperClient.convert(bpl.get(j));
BlockInfo storedBlock = bm.getStoredBlock(blk);
if(storedBlock == null) {
storedBlock = (BlockInfoContiguous) fsn.getBlockManager()
.addBlockCollectionWithCheck(new BlockInfoContiguous(blk,
copy.getFileReplication()), file);
}
blocks[j] = storedBlock;
}
if(blocks.length > 0) {
diff.setBlocks(blocks);
}
diffs.addFirst(diff);
}
file.addSnapshotFeature(diffs);
short repl = file.getPreferredBlockReplication();
for (BlockInfo b : file.getBlocks()) {
if (b.getReplication() < repl) {
bm.setReplication(b.getReplication(), repl, b);
}
}
}
/** Load the created list in a DirectoryDiff */
private List<INode> loadCreatedList(InputStream in, INodeDirectory dir,
int size) throws IOException {
List<INode> clist = new ArrayList<INode>(size);
for (long c = 0; c < size; c++) {
CreatedListEntry entry = CreatedListEntry.parseDelimitedFrom(in);
INode created = SnapshotFSImageFormat.loadCreated(entry.getName()
.toByteArray(), dir);
clist.add(created);
}
return clist;
}
private void addToDeletedList(INode dnode, INodeDirectory parent) {
dnode.setParent(parent);
if (dnode.isFile()) {
updateBlocksMap(dnode.asFile(), fsn.getBlockManager());
}
}
/**
* Load the deleted list in a DirectoryDiff
*/
private List<INode> loadDeletedList(final List<INodeReference> refList,
InputStream in, INodeDirectory dir, List<Long> deletedNodes,
List<Integer> deletedRefNodes)
throws IOException {
List<INode> dlist = new ArrayList<INode>(deletedRefNodes.size()
+ deletedNodes.size());
// load non-reference inodes
for (long deletedId : deletedNodes) {
INode deleted = fsDir.getInode(deletedId);
dlist.add(deleted);
addToDeletedList(deleted, dir);
}
// load reference nodes in the deleted list
for (int refId : deletedRefNodes) {
INodeReference deletedRef = refList.get(refId);
dlist.add(deletedRef);
addToDeletedList(deletedRef, dir);
}
Collections.sort(dlist, new Comparator<INode>() {
@Override
public int compare(INode n1, INode n2) {
return n1.compareTo(n2.getLocalNameBytes());
}
});
return dlist;
}
/** Load DirectoryDiff list for a directory with snapshot feature */
private void loadDirectoryDiffList(InputStream in, INodeDirectory dir,
int size, final List<INodeReference> refList) throws IOException {
if (!dir.isWithSnapshot()) {
dir.addSnapshotFeature(null);
}
DirectoryDiffList diffs = dir.getDiffs();
final LoaderContext state = parent.getLoaderContext();
for (int i = 0; i < size; i++) {
// load a directory diff
SnapshotDiffSection.DirectoryDiff diffInPb = SnapshotDiffSection.
DirectoryDiff.parseDelimitedFrom(in);
final int snapshotId = diffInPb.getSnapshotId();
final Snapshot snapshot = snapshotMap.get(snapshotId);
int childrenSize = diffInPb.getChildrenSize();
boolean useRoot = diffInPb.getIsSnapshotRoot();
INodeDirectoryAttributes copy = null;
if (useRoot) {
copy = snapshot.getRoot();
} else if (diffInPb.hasSnapshotCopy()) {
INodeSection.INodeDirectory dirCopyInPb = diffInPb.getSnapshotCopy();
final byte[] name = diffInPb.getName().toByteArray();
PermissionStatus permission = loadPermission(
dirCopyInPb.getPermission(), state.getStringTable());
AclFeature acl = null;
if (dirCopyInPb.hasAcl()) {
int[] entries = AclEntryStatusFormat
.toInt(FSImageFormatPBINode.Loader.loadAclEntries(
dirCopyInPb.getAcl(), state.getStringTable()));
acl = new AclFeature(entries);
}
XAttrFeature xAttrs = null;
if (dirCopyInPb.hasXAttrs()) {
xAttrs = new XAttrFeature(FSImageFormatPBINode.Loader.loadXAttrs(
dirCopyInPb.getXAttrs(), state.getStringTable()));
}
long modTime = dirCopyInPb.getModificationTime();
boolean noQuota = dirCopyInPb.getNsQuota() == -1
&& dirCopyInPb.getDsQuota() == -1
&& (!dirCopyInPb.hasTypeQuotas());
if (noQuota) {
copy = new INodeDirectoryAttributes.SnapshotCopy(name,
permission, acl, modTime, xAttrs);
} else {
EnumCounters<StorageType> typeQuotas = null;
if (dirCopyInPb.hasTypeQuotas()) {
ImmutableList<QuotaByStorageTypeEntry> qes =
FSImageFormatPBINode.Loader.loadQuotaByStorageTypeEntries(
dirCopyInPb.getTypeQuotas());
typeQuotas = new EnumCounters<StorageType>(StorageType.class,
HdfsConstants.QUOTA_RESET);
for (QuotaByStorageTypeEntry qe : qes) {
if (qe.getQuota() >= 0 && qe.getStorageType() != null &&
qe.getStorageType().supportTypeQuota()) {
typeQuotas.set(qe.getStorageType(), qe.getQuota());
}
}
}
copy = new INodeDirectoryAttributes.CopyWithQuota(name, permission,
acl, modTime, dirCopyInPb.getNsQuota(),
dirCopyInPb.getDsQuota(), typeQuotas, xAttrs);
}
}
// load created list
List<INode> clist = loadCreatedList(in, dir,
diffInPb.getCreatedListSize());
// load deleted list
List<INode> dlist = loadDeletedList(refList, in, dir,
diffInPb.getDeletedINodeList(), diffInPb.getDeletedINodeRefList());
// create the directory diff
DirectoryDiff diff = new DirectoryDiff(snapshotId, copy, null,
childrenSize, clist, dlist, useRoot);
diffs.addFirst(diff);
}
}
}
/**
* Saving snapshot related information to protobuf based FSImage
*/
public final static class Saver {
private final FSNamesystem fsn;
private final FileSummary.Builder headers;
private final FSImageFormatProtobuf.Saver parent;
private final SaveNamespaceContext context;
private long numImageErrors;
public Saver(FSImageFormatProtobuf.Saver parent,
FileSummary.Builder headers, SaveNamespaceContext context,
FSNamesystem fsn) {
this.parent = parent;
this.headers = headers;
this.context = context;
this.fsn = fsn;
this.numImageErrors = 0;
}
/**
* save all the snapshottable directories and snapshots to fsimage
*/
public void serializeSnapshotSection(OutputStream out) throws IOException {
SnapshotManager sm = fsn.getSnapshotManager();
SnapshotSection.Builder b = SnapshotSection.newBuilder()
.setSnapshotCounter(sm.getSnapshotCounter())
.setNumSnapshots(sm.getNumSnapshots());
final List<INodeDirectory> snapshottables = sm.getSnapshottableDirs();
for (INodeDirectory sdir : snapshottables) {
b.addSnapshottableDir(sdir.getId());
}
b.build().writeDelimitedTo(out);
int i = 0;
for(INodeDirectory sdir : snapshottables) {
for (Snapshot s : sdir.getDirectorySnapshottableFeature()
.getSnapshotList()) {
Root sroot = s.getRoot();
SnapshotSection.Snapshot.Builder sb = SnapshotSection.Snapshot
.newBuilder().setSnapshotId(s.getId());
INodeSection.INodeDirectory.Builder db = buildINodeDirectory(sroot,
parent.getSaverContext());
INodeSection.INode r = INodeSection.INode.newBuilder()
.setId(sroot.getId())
.setType(INodeSection.INode.Type.DIRECTORY)
.setName(ByteString.copyFrom(sroot.getLocalNameBytes()))
.setDirectory(db).build();
sb.setRoot(r).build().writeDelimitedTo(out);
i++;
if (i % FSImageFormatProtobuf.Saver.CHECK_CANCEL_INTERVAL == 0) {
context.checkCancelled();
}
}
}
Preconditions.checkState(i == sm.getNumSnapshots());
parent.commitSection(headers, FSImageFormatProtobuf.SectionName.SNAPSHOT);
}
/**
* This can only be called after serializing both INode_Dir and SnapshotDiff
*/
public void serializeINodeReferenceSection(OutputStream out)
throws IOException {
final List<INodeReference> refList = parent.getSaverContext()
.getRefList();
long i = 0;
for (INodeReference ref : refList) {
INodeReferenceSection.INodeReference.Builder rb =
buildINodeReference(ref, i++);
rb.build().writeDelimitedTo(out);
}
parent.commitSection(headers, SectionName.INODE_REFERENCE);
}
private INodeReferenceSection.INodeReference.Builder buildINodeReference(
final INodeReference ref, final long refIndex) throws IOException {
INodeReferenceSection.INodeReference.Builder rb =
INodeReferenceSection.INodeReference.newBuilder().
setReferredId(ref.getId());
if (ref instanceof WithName) {
rb.setLastSnapshotId(((WithName) ref).getLastSnapshotId()).setName(
ByteString.copyFrom(ref.getLocalNameBytes()));
} else if (ref instanceof DstReference) {
rb.setDstSnapshotId(ref.getDstSnapshotId());
}
if (fsn.getFSDirectory().getInode(ref.getId()) == null) {
FSImage.LOG.error(
"FSImageFormatPBSnapshot: Missing referred INodeId " +
ref.getId() + " for INodeReference index " + refIndex +
"; path=" + ref.getFullPathName() +
"; parent=" + (ref.getParent() == null ? "null" :
ref.getParent().getFullPathName()));
++numImageErrors;
}
return rb;
}
/**
* save all the snapshot diff to fsimage
*/
public void serializeSnapshotDiffSection(OutputStream out)
throws IOException {
INodeMap inodesMap = fsn.getFSDirectory().getINodeMap();
final List<INodeReference> refList = parent.getSaverContext()
.getRefList();
int i = 0;
Iterator<INodeWithAdditionalFields> iter = inodesMap.getMapIterator();
while (iter.hasNext()) {
INodeWithAdditionalFields inode = iter.next();
if (inode.isFile()) {
serializeFileDiffList(inode.asFile(), out);
} else if (inode.isDirectory()) {
serializeDirDiffList(inode.asDirectory(), refList, out);
}
++i;
if (i % FSImageFormatProtobuf.Saver.CHECK_CANCEL_INTERVAL == 0) {
context.checkCancelled();
}
if (i % parent.getInodesPerSubSection() == 0) {
parent.commitSubSection(headers,
FSImageFormatProtobuf.SectionName.SNAPSHOT_DIFF_SUB);
}
}
parent.commitSectionAndSubSection(headers,
FSImageFormatProtobuf.SectionName.SNAPSHOT_DIFF,
FSImageFormatProtobuf.SectionName.SNAPSHOT_DIFF_SUB);
}
private void serializeFileDiffList(INodeFile file, OutputStream out)
throws IOException {
FileWithSnapshotFeature sf = file.getFileWithSnapshotFeature();
if (sf != null) {
DiffList<FileDiff> diffList = sf.getDiffs().asList();
SnapshotDiffSection.DiffEntry entry = SnapshotDiffSection.DiffEntry
.newBuilder().setInodeId(file.getId()).setType(Type.FILEDIFF)
.setNumOfDiff(diffList.size()).build();
entry.writeDelimitedTo(out);
for (int i = diffList.size() - 1; i >= 0; i--) {
FileDiff diff = diffList.get(i);
SnapshotDiffSection.FileDiff.Builder fb = SnapshotDiffSection.FileDiff
.newBuilder().setSnapshotId(diff.getSnapshotId())
.setFileSize(diff.getFileSize());
if(diff.getBlocks() != null) {
for(Block block : diff.getBlocks()) {
fb.addBlocks(PBHelperClient.convert(block));
}
}
INodeFileAttributes copy = diff.snapshotINode;
if (copy != null) {
fb.setName(ByteString.copyFrom(copy.getLocalNameBytes()))
.setSnapshotCopy(buildINodeFile(copy, parent.getSaverContext()));
}
fb.build().writeDelimitedTo(out);
}
}
}
private void saveCreatedList(List<INode> created, OutputStream out)
throws IOException {
// local names of the created list member
for (INode c : created) {
SnapshotDiffSection.CreatedListEntry.newBuilder()
.setName(ByteString.copyFrom(c.getLocalNameBytes())).build()
.writeDelimitedTo(out);
}
}
private void serializeDirDiffList(INodeDirectory dir,
final List<INodeReference> refList, OutputStream out)
throws IOException {
DirectoryWithSnapshotFeature sf = dir.getDirectoryWithSnapshotFeature();
if (sf != null) {
DiffList<DirectoryDiff> diffList = sf.getDiffs().asList();
SnapshotDiffSection.DiffEntry entry = SnapshotDiffSection.DiffEntry
.newBuilder().setInodeId(dir.getId()).setType(Type.DIRECTORYDIFF)
.setNumOfDiff(diffList.size()).build();
entry.writeDelimitedTo(out);
for (int i = diffList.size() - 1; i >= 0; i--) { // reverse order!
DirectoryDiff diff = diffList.get(i);
SnapshotDiffSection.DirectoryDiff.Builder db = SnapshotDiffSection.
DirectoryDiff.newBuilder().setSnapshotId(diff.getSnapshotId())
.setChildrenSize(diff.getChildrenSize())
.setIsSnapshotRoot(diff.isSnapshotRoot());
INodeDirectoryAttributes copy = diff.snapshotINode;
if (!diff.isSnapshotRoot() && copy != null) {
db.setName(ByteString.copyFrom(copy.getLocalNameBytes()))
.setSnapshotCopy(
buildINodeDirectory(copy, parent.getSaverContext()));
}
// process created list and deleted list
List<INode> created = diff.getChildrenDiff().getCreatedUnmodifiable();
db.setCreatedListSize(created.size());
List<INode> deleted = diff.getChildrenDiff().getDeletedUnmodifiable();
INode previousNode = null;
boolean misordered = false;
for (INode d : deleted) {
// getBytes() may return null below, and that is okay.
final int result = previousNode == null ? -1 :
previousNode.compareTo(d.getLocalNameBytes());
if (result == 0) {
FSImage.LOG.error(
"Name '" + d.getLocalName() + "' is repeated in the " +
"'deleted' difflist of directory " +
dir.getFullPathName() + ", INodeId=" + dir.getId());
++numImageErrors;
} else if (result > 0 && !misordered) {
misordered = true;
++numImageErrors;
}
previousNode = d;
if (d.isReference()) {
refList.add(d.asReference());
db.addDeletedINodeRef(refList.size() - 1);
} else {
db.addDeletedINode(d.getId());
}
}
if (misordered) {
FSImage.LOG.error(
"Misordered entries in the 'deleted' difflist of directory " +
dir.getFullPathName() + ", INodeId=" + dir.getId() +
". The full list is " +
Arrays.toString(deleted.toArray()));
}
db.build().writeDelimitedTo(out);
saveCreatedList(created, out);
}
}
}
/**
* Number of non-fatal errors detected while writing the
* SnapshotDiff and INodeReference sections.
* @return the number of non-fatal errors detected.
*/
public long getNumImageErrors() {
return numImageErrors;
}
}
private FSImageFormatPBSnapshot(){}
}
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hadoop AbstractINodeDiffList 源码
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