hadoop FSImageFormatPBINode 源码

  • 2022-10-20
  • 浏览 (173)

haddop FSImageFormatPBINode 代码

文件路径:/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormatPBINode.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;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.HadoopIllegalArgumentException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.permission.AclEntry;
import org.apache.hadoop.fs.permission.PermissionStatus;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.fs.XAttr;
import org.apache.hadoop.hdfs.protocol.Block;
import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
import org.apache.hadoop.hdfs.protocol.HdfsConstants;
import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
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.BlockInfoStriped;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockManager;
import org.apache.hadoop.hdfs.protocol.BlockType;
import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf.LoaderContext;
import org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf.SaverContext;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.FileSummary;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.FilesUnderConstructionSection.FileUnderConstructionEntry;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeDirectorySection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.AclFeatureProto;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.XAttrCompactProto;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.XAttrFeatureProto;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.QuotaByStorageTypeEntryProto;
import org.apache.hadoop.hdfs.server.namenode.FsImageProto.INodeSection.QuotaByStorageTypeFeatureProto;
import org.apache.hadoop.hdfs.server.namenode.INodeWithAdditionalFields.PermissionStatusFormat;
import org.apache.hadoop.hdfs.server.namenode.SerialNumberManager.StringTable;
import org.apache.hadoop.hdfs.server.namenode.snapshot.Snapshot;
import org.apache.hadoop.hdfs.server.namenode.startupprogress.Phase;
import org.apache.hadoop.hdfs.server.namenode.startupprogress.StartupProgress;
import org.apache.hadoop.hdfs.server.namenode.startupprogress.StartupProgress.Counter;
import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step;
import org.apache.hadoop.hdfs.util.EnumCounters;
import org.apache.hadoop.hdfs.util.ReadOnlyList;

import org.apache.hadoop.util.Preconditions;
import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;
import org.apache.hadoop.thirdparty.protobuf.ByteString;

@InterfaceAudience.Private
public final class FSImageFormatPBINode {
  public static final int ACL_ENTRY_NAME_MASK = (1 << 24) - 1;
  public static final int ACL_ENTRY_NAME_OFFSET = 6;
  public static final int ACL_ENTRY_TYPE_OFFSET = 3;
  public static final int ACL_ENTRY_SCOPE_OFFSET = 5;
  public static final int ACL_ENTRY_PERM_MASK = 7;
  
  public static final int XATTR_NAMESPACE_MASK = 3;
  public static final int XATTR_NAMESPACE_OFFSET = 30;
  public static final int XATTR_NAME_MASK = (1 << 24) - 1;
  public static final int XATTR_NAME_OFFSET = 6;

  /* See the comments in fsimage.proto for an explanation of the following. */
  public static final int XATTR_NAMESPACE_EXT_OFFSET = 5;
  public static final int XATTR_NAMESPACE_EXT_MASK = 1;

  private static final Logger LOG =
      LoggerFactory.getLogger(FSImageFormatPBINode.class);

  private static final int DIRECTORY_ENTRY_BATCH_SIZE = 1000;

  // the loader must decode all fields referencing serial number based fields
  // via to<Item> methods with the string table.
  public final static class Loader {
    public static PermissionStatus loadPermission(long id,
        final StringTable stringTable) {
      return PermissionStatusFormat.toPermissionStatus(id, stringTable);
    }

    public static ImmutableList<AclEntry> loadAclEntries(
        AclFeatureProto proto, final StringTable stringTable) {
      ImmutableList.Builder<AclEntry> b = ImmutableList.builder();
      for (int v : proto.getEntriesList()) {
        b.add(AclEntryStatusFormat.toAclEntry(v, stringTable));
      }
      return b.build();
    }
    
    public static List<XAttr> loadXAttrs(
        XAttrFeatureProto proto, final StringTable stringTable) {
      List<XAttr> b = new ArrayList<>();
      for (XAttrCompactProto xAttrCompactProto : proto.getXAttrsList()) {
        int v = xAttrCompactProto.getName();
        byte[] value = null;
        if (xAttrCompactProto.getValue() != null) {
          value = xAttrCompactProto.getValue().toByteArray();
        }
        b.add(XAttrFormat.toXAttr(v, value, stringTable));
      }
      
      return b;
    }

    public static ImmutableList<QuotaByStorageTypeEntry> loadQuotaByStorageTypeEntries(
      QuotaByStorageTypeFeatureProto proto) {
      ImmutableList.Builder<QuotaByStorageTypeEntry> b = ImmutableList.builder();
      for (QuotaByStorageTypeEntryProto quotaEntry : proto.getQuotasList()) {
        StorageType type = PBHelperClient.convertStorageType(quotaEntry.getStorageType());
        long quota = quotaEntry.getQuota();
        b.add(new QuotaByStorageTypeEntry.Builder().setStorageType(type)
            .setQuota(quota).build());
      }
      return b.build();
    }

    public static INodeDirectory loadINodeDirectory(INodeSection.INode n,
        LoaderContext state) {
      assert n.getType() == INodeSection.INode.Type.DIRECTORY;
      INodeSection.INodeDirectory d = n.getDirectory();

      final PermissionStatus permissions = loadPermission(d.getPermission(),
          state.getStringTable());
      final INodeDirectory dir = new INodeDirectory(n.getId(), n.getName()
          .toByteArray(), permissions, d.getModificationTime());
      final long nsQuota = d.getNsQuota(), dsQuota = d.getDsQuota();
      if (nsQuota >= 0 || dsQuota >= 0) {
        dir.addDirectoryWithQuotaFeature(new DirectoryWithQuotaFeature.Builder().
            nameSpaceQuota(nsQuota).storageSpaceQuota(dsQuota).build());
      }
      EnumCounters<StorageType> typeQuotas = null;
      if (d.hasTypeQuotas()) {
        ImmutableList<QuotaByStorageTypeEntry> qes =
            loadQuotaByStorageTypeEntries(d.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());
          }
        }

        if (typeQuotas.anyGreaterOrEqual(0)) {
          DirectoryWithQuotaFeature q = dir.getDirectoryWithQuotaFeature();
          if (q == null) {
            dir.addDirectoryWithQuotaFeature(new DirectoryWithQuotaFeature.
                Builder().typeQuotas(typeQuotas).build());
          } else {
            q.setQuota(typeQuotas);
          }
        }
      }

      if (d.hasAcl()) {
        int[] entries = AclEntryStatusFormat.toInt(loadAclEntries(
            d.getAcl(), state.getStringTable()));
        dir.addAclFeature(new AclFeature(entries));
      }
      if (d.hasXAttrs()) {
        dir.addXAttrFeature(new XAttrFeature(
            loadXAttrs(d.getXAttrs(), state.getStringTable())));
      }
      return dir;
    }

    public static void updateBlocksMap(INodeFile file, BlockManager bm) {
      // Add file->block mapping
      final BlockInfo[] blocks = file.getBlocks();
      if (blocks != null) {
        for (int i = 0; i < blocks.length; i++) {
          file.setBlock(i, bm.addBlockCollectionWithCheck(blocks[i], file));
        }
      }
    }

    private final FSDirectory dir;
    private final FSNamesystem fsn;
    private final FSImageFormatProtobuf.Loader parent;

    // Update blocks map by single thread asynchronously
    private ExecutorService blocksMapUpdateExecutor;
    // update name cache by single thread asynchronously.
    private ExecutorService nameCacheUpdateExecutor;

    Loader(FSNamesystem fsn, final FSImageFormatProtobuf.Loader parent) {
      this.fsn = fsn;
      this.dir = fsn.dir;
      this.parent = parent;
      // Note: these executors must be SingleThreadExecutor, as they
      // are used to modify structures which are not thread safe.
      blocksMapUpdateExecutor = Executors.newSingleThreadExecutor();
      nameCacheUpdateExecutor = Executors.newSingleThreadExecutor();
    }

    void loadINodeDirectorySectionInParallel(ExecutorService service,
        ArrayList<FileSummary.Section> sections, String compressionCodec)
        throws IOException {
      LOG.info("Loading the INodeDirectory section in parallel with {} sub-" +
              "sections", sections.size());
      CountDownLatch latch = new CountDownLatch(sections.size());
      final CopyOnWriteArrayList<IOException> exceptions =
          new CopyOnWriteArrayList<>();
      for (FileSummary.Section s : sections) {
        service.submit(() -> {
          InputStream ins = null;
          try {
            ins = parent.getInputStreamForSection(s,
                compressionCodec);
            loadINodeDirectorySection(ins);
          } catch (Exception e) {
            LOG.error("An exception occurred loading INodeDirectories in " +
                "parallel", e);
            exceptions.add(new IOException(e));
          } finally {
            latch.countDown();
            try {
              if (ins != null) {
                ins.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);
      }
      if (exceptions.size() != 0) {
        LOG.error("{} exceptions occurred loading INodeDirectories",
            exceptions.size());
        throw exceptions.get(0);
      }
      LOG.info("Completed loading all INodeDirectory sub-sections");
    }

    void loadINodeDirectorySection(InputStream in) throws IOException {
      final List<INodeReference> refList = parent.getLoaderContext()
          .getRefList();
      while (true) {
        INodeDirectorySection.DirEntry e = INodeDirectorySection.DirEntry
            .parseDelimitedFrom(in);
        // note that in is a LimitedInputStream
        if (e == null) {
          break;
        }
        INodeDirectory p = dir.getInode(e.getParent()).asDirectory();
        for (long id : e.getChildrenList()) {
          INode child = dir.getInode(id);
          if (!addToParent(p, child)) {
            LOG.warn("Failed to add the inode {} to the directory {}",
                child.getId(), p.getId());
          }
        }

        for (int refId : e.getRefChildrenList()) {
          INodeReference ref = refList.get(refId);
          if (!addToParent(p, ref)) {
            LOG.warn("Failed to add the inode reference {} to the directory {}",
                ref.getId(), p.getId());
          }
        }
      }
    }

    private void fillUpInodeList(ArrayList<INode> inodeList, INode inode) {
      if (inode.isFile()) {
        inodeList.add(inode);
      }
      if (inodeList.size() >= DIRECTORY_ENTRY_BATCH_SIZE) {
        addToCacheAndBlockMap(inodeList);
        inodeList.clear();
      }
    }

    private void addToCacheAndBlockMap(final ArrayList<INode> inodeList) {
      final ArrayList<INode> inodes = new ArrayList<>(inodeList);
      nameCacheUpdateExecutor.submit(
          new Runnable() {
            @Override
            public void run() {
              addToCacheInternal(inodes);
            }
          });
      blocksMapUpdateExecutor.submit(
          new Runnable() {
            @Override
            public void run() {
              updateBlockMapInternal(inodes);
            }
          });
    }

    // update name cache with non-thread safe
    private void addToCacheInternal(ArrayList<INode> inodeList) {
      for (INode i : inodeList) {
        dir.cacheName(i);
      }
    }

     // update blocks map with non-thread safe
    private void updateBlockMapInternal(ArrayList<INode> inodeList) {
      for (INode i : inodeList) {
        updateBlocksMap(i.asFile(), fsn.getBlockManager());
      }
    }

    void waitBlocksMapAndNameCacheUpdateFinished() throws IOException {
      long start = System.currentTimeMillis();
      waitExecutorTerminated(blocksMapUpdateExecutor);
      waitExecutorTerminated(nameCacheUpdateExecutor);
      LOG.info("Completed update blocks map and name cache, total waiting "
          + "duration {}ms.", (System.currentTimeMillis() - start));
    }

    private void waitExecutorTerminated(ExecutorService executorService)
        throws IOException {
      executorService.shutdown();
      long start = System.currentTimeMillis();
      while (!executorService.isTerminated()) {
        try {
          executorService.awaitTermination(1, TimeUnit.SECONDS);
          if (LOG.isDebugEnabled()) {
            LOG.debug("Waiting to executor service terminated duration {}ms.",
                (System.currentTimeMillis() - start));
          }
        } catch (InterruptedException e) {
          LOG.error("Interrupted waiting for executor terminated.", e);
          throw new IOException(e);
        }
      }
    }

    void loadINodeSection(InputStream in, StartupProgress prog,
        Step currentStep) throws IOException {
      loadINodeSectionHeader(in, prog, currentStep);
      Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, currentStep);
      int totalLoaded = loadINodesInSection(in, counter);
      LOG.info("Successfully loaded {} inodes", totalLoaded);
    }

    private int loadINodesInSection(InputStream in, Counter counter)
        throws IOException {
      // As the input stream is a LimitInputStream, the reading will stop when
      // EOF is encountered at the end of the stream.
      int cntr = 0;
      ArrayList<INode> inodeList = new ArrayList<>();
      while (true) {
        INodeSection.INode p = INodeSection.INode.parseDelimitedFrom(in);
        if (p == null) {
          break;
        }
        if (p.getId() == INodeId.ROOT_INODE_ID) {
          synchronized(this) {
            loadRootINode(p);
          }
        } else {
          INode n = loadINode(p);
          synchronized(this) {
            dir.addToInodeMap(n);
          }
          fillUpInodeList(inodeList, n);
        }
        cntr++;
        if (counter != null) {
          counter.increment();
        }
      }
      if (inodeList.size() > 0){
        addToCacheAndBlockMap(inodeList);
      }
      return cntr;
    }


    private long loadINodeSectionHeader(InputStream in, StartupProgress prog,
        Step currentStep) throws IOException {
      INodeSection s = INodeSection.parseDelimitedFrom(in);
      fsn.dir.resetLastInodeId(s.getLastInodeId());
      long numInodes = s.getNumInodes();
      LOG.info("Loading " + numInodes + " INodes.");
      prog.setTotal(Phase.LOADING_FSIMAGE, currentStep, numInodes);
      return numInodes;
    }

    void loadINodeSectionInParallel(ExecutorService service,
        ArrayList<FileSummary.Section> sections,
        String compressionCodec, StartupProgress prog,
        Step currentStep) throws IOException {
      LOG.info("Loading the INode section in parallel with {} sub-sections",
          sections.size());
      long expectedInodes = 0;
      CountDownLatch latch = new CountDownLatch(sections.size());
      AtomicInteger totalLoaded = new AtomicInteger(0);
      final CopyOnWriteArrayList<IOException> exceptions =
          new CopyOnWriteArrayList<>();

      for (int i=0; i < sections.size(); i++) {
        FileSummary.Section s = sections.get(i);
        InputStream ins = parent.getInputStreamForSection(s, compressionCodec);
        if (i == 0) {
          // The first inode section has a header which must be processed first
          expectedInodes = loadINodeSectionHeader(ins, prog, currentStep);
        }
        service.submit(() -> {
          try {
            totalLoaded.addAndGet(loadINodesInSection(ins, null));
            prog.setCount(Phase.LOADING_FSIMAGE, currentStep,
                totalLoaded.get());
          } catch (Exception e) {
            LOG.error("An exception occurred loading INodes in parallel", e);
            exceptions.add(new IOException(e));
          } finally {
            latch.countDown();
            try {
              ins.close();
            } catch (IOException ioe) {
              LOG.warn("Failed to close the input stream, ignoring", ioe);
            }
          }
        });
      }
      try {
        latch.await();
      } catch (InterruptedException e) {
        LOG.info("Interrupted waiting for countdown latch");
      }
      if (exceptions.size() != 0) {
        LOG.error("{} exceptions occurred loading INodes", exceptions.size());
        throw exceptions.get(0);
      }
      if (totalLoaded.get() != expectedInodes) {
        throw new IOException("Expected to load "+expectedInodes+" in " +
            "parallel, but loaded "+totalLoaded.get()+". The image may " +
            "be corrupt.");
      }
      LOG.info("Completed loading all INode sections. Loaded {} inodes.",
          totalLoaded.get());
    }

    /**
     * Load the under-construction files section, and update the lease map
     */
    void loadFilesUnderConstructionSection(InputStream in) throws IOException {
      // Leases are added when the inode section is loaded. This section is
      // still read in for compatibility reasons.
      while (true) {
        FileUnderConstructionEntry entry = FileUnderConstructionEntry
            .parseDelimitedFrom(in);
        if (entry == null) {
          break;
        }
      }
    }

    private boolean addToParent(INodeDirectory parentDir, INode child) {
      if (parentDir == dir.rootDir && FSDirectory.isReservedName(child)) {
        throw new HadoopIllegalArgumentException("File name \""
            + child.getLocalName() + "\" is reserved. Please "
            + " change the name of the existing file or directory to another "
            + "name before upgrading to this release.");
      }
      // NOTE: This does not update space counts for parents
      if (!parentDir.addChildAtLoading(child)) {
        return false;
      }
      return true;
    }

    private INode loadINode(INodeSection.INode n) {
      switch (n.getType()) {
      case FILE:
        return loadINodeFile(n);
      case DIRECTORY:
        return loadINodeDirectory(n, parent.getLoaderContext());
      case SYMLINK:
        return loadINodeSymlink(n);
      default:
        break;
      }
      return null;
    }

    private INodeFile loadINodeFile(INodeSection.INode n) {
      assert n.getType() == INodeSection.INode.Type.FILE;
      INodeSection.INodeFile f = n.getFile();
      List<BlockProto> bp = f.getBlocksList();
      BlockType blockType = PBHelperClient.convert(f.getBlockType());
      LoaderContext state = parent.getLoaderContext();
      boolean isStriped = f.hasErasureCodingPolicyID();
      assert ((!isStriped) || (isStriped && !f.hasReplication()));
      Short replication = (!isStriped ? (short) f.getReplication() : null);
      Byte ecPolicyID = (isStriped ?
          (byte) f.getErasureCodingPolicyID() : null);
      ErasureCodingPolicy ecPolicy = isStriped ?
          fsn.getErasureCodingPolicyManager().getByID(ecPolicyID) : null;

      BlockInfo[] blocks = new BlockInfo[bp.size()];
      for (int i = 0; i < bp.size(); ++i) {
        BlockProto b = bp.get(i);
        if (isStriped) {
          Preconditions.checkState(ecPolicy.getId() > 0,
              "File with ID " + n.getId() +
              " has an invalid erasure coding policy ID " + ecPolicy.getId());
          blocks[i] = new BlockInfoStriped(PBHelperClient.convert(b), ecPolicy);
        } else {
          blocks[i] = new BlockInfoContiguous(PBHelperClient.convert(b),
              replication);
        }
      }

      final PermissionStatus permissions = loadPermission(f.getPermission(),
          parent.getLoaderContext().getStringTable());

      final INodeFile file = new INodeFile(n.getId(),
          n.getName().toByteArray(), permissions, f.getModificationTime(),
          f.getAccessTime(), blocks, replication, ecPolicyID,
          f.getPreferredBlockSize(), (byte)f.getStoragePolicyID(), blockType);

      if (f.hasAcl()) {
        int[] entries = AclEntryStatusFormat.toInt(loadAclEntries(
            f.getAcl(), state.getStringTable()));
        file.addAclFeature(new AclFeature(entries));
      }

      if (f.hasXAttrs()) {
        file.addXAttrFeature(new XAttrFeature(
            loadXAttrs(f.getXAttrs(), state.getStringTable())));
      }

      // under-construction information
      if (f.hasFileUC()) {
        INodeSection.FileUnderConstructionFeature uc = f.getFileUC();
        file.toUnderConstruction(uc.getClientName(), uc.getClientMachine());
        // update the lease manager
        fsn.leaseManager.addLease(uc.getClientName(), file.getId());
        if (blocks.length > 0) {
          BlockInfo lastBlk = file.getLastBlock();
          // replace the last block of file
          final BlockInfo ucBlk;
          if (isStriped) {
            BlockInfoStriped striped = (BlockInfoStriped) lastBlk;
            ucBlk = new BlockInfoStriped(striped, ecPolicy);
          } else {
            ucBlk = new BlockInfoContiguous(lastBlk,
                replication);
          }
          ucBlk.convertToBlockUnderConstruction(
              HdfsServerConstants.BlockUCState.UNDER_CONSTRUCTION, null);
          file.setBlock(file.numBlocks() - 1, ucBlk);
        }
      }
      return file;
    }


    private INodeSymlink loadINodeSymlink(INodeSection.INode n) {
      assert n.getType() == INodeSection.INode.Type.SYMLINK;
      INodeSection.INodeSymlink s = n.getSymlink();
      final PermissionStatus permissions = loadPermission(s.getPermission(),
          parent.getLoaderContext().getStringTable());

      INodeSymlink sym = new INodeSymlink(n.getId(), n.getName().toByteArray(),
          permissions, s.getModificationTime(), s.getAccessTime(),
          s.getTarget().toStringUtf8());

      return sym;
    }

    private void loadRootINode(INodeSection.INode p) {
      INodeDirectory root = loadINodeDirectory(p, parent.getLoaderContext());
      final QuotaCounts q = root.getQuotaCounts();
      final long nsQuota = q.getNameSpace();
      final long dsQuota = q.getStorageSpace();
      if (nsQuota != -1 || dsQuota != -1) {
        dir.rootDir.getDirectoryWithQuotaFeature().setQuota(nsQuota, dsQuota);
      }
      final EnumCounters<StorageType> typeQuotas = q.getTypeSpaces();
      if (typeQuotas.anyGreaterOrEqual(0)) {
        dir.rootDir.getDirectoryWithQuotaFeature().setQuota(typeQuotas);
      }
      dir.rootDir.cloneModificationTime(root);
      dir.rootDir.clonePermissionStatus(root);
      final AclFeature af = root.getFeature(AclFeature.class);
      if (af != null) {
        dir.rootDir.addAclFeature(af);
      }
      // root dir supports having extended attributes according to POSIX
      final XAttrFeature f = root.getXAttrFeature();
      if (f != null) {
        dir.rootDir.addXAttrFeature(f);
      }
      dir.addRootDirToEncryptionZone(f);
    }
  }

  // the saver can directly write out fields referencing serial numbers.
  // the serial number maps will be compacted when loading.
  public final static class Saver {
    private long numImageErrors;

    private static long buildPermissionStatus(INodeAttributes n) {
      return n.getPermissionLong();
    }

    private static AclFeatureProto.Builder buildAclEntries(AclFeature f) {
      AclFeatureProto.Builder b = AclFeatureProto.newBuilder();
      for (int pos = 0, e; pos < f.getEntriesSize(); pos++) {
        e = f.getEntryAt(pos);
        b.addEntries(e);
      }
      return b;
    }

    private static XAttrFeatureProto.Builder buildXAttrs(XAttrFeature f) {
      XAttrFeatureProto.Builder b = XAttrFeatureProto.newBuilder();
      for (XAttr a : f.getXAttrs()) {
        XAttrCompactProto.Builder xAttrCompactBuilder = XAttrCompactProto.
            newBuilder();
        int v = XAttrFormat.toInt(a);
        xAttrCompactBuilder.setName(v);
        if (a.getValue() != null) {
          xAttrCompactBuilder.setValue(PBHelperClient.getByteString(a.getValue()));
        }
        b.addXAttrs(xAttrCompactBuilder.build());
      }
      
      return b;
    }

    private static QuotaByStorageTypeFeatureProto.Builder
        buildQuotaByStorageTypeEntries(QuotaCounts q) {
      QuotaByStorageTypeFeatureProto.Builder b =
          QuotaByStorageTypeFeatureProto.newBuilder();
      for (StorageType t: StorageType.getTypesSupportingQuota()) {
        if (q.getTypeSpace(t) >= 0) {
          QuotaByStorageTypeEntryProto.Builder eb =
              QuotaByStorageTypeEntryProto.newBuilder().
              setStorageType(PBHelperClient.convertStorageType(t)).
              setQuota(q.getTypeSpace(t));
          b.addQuotas(eb);
        }
      }
      return b;
    }

    public static INodeSection.INodeFile.Builder buildINodeFile(
        INodeFileAttributes file, final SaverContext state) {
      INodeSection.INodeFile.Builder b = INodeSection.INodeFile.newBuilder()
          .setAccessTime(file.getAccessTime())
          .setModificationTime(file.getModificationTime())
          .setPermission(buildPermissionStatus(file))
          .setPreferredBlockSize(file.getPreferredBlockSize())
          .setStoragePolicyID(file.getLocalStoragePolicyID())
          .setBlockType(PBHelperClient.convert(file.getBlockType()));

      if (file.isStriped()) {
        b.setErasureCodingPolicyID(file.getErasureCodingPolicyID());
      } else {
        b.setReplication(file.getFileReplication());
      }

      AclFeature f = file.getAclFeature();
      if (f != null) {
        b.setAcl(buildAclEntries(f));
      }
      XAttrFeature xAttrFeature = file.getXAttrFeature();
      if (xAttrFeature != null) {
        b.setXAttrs(buildXAttrs(xAttrFeature));
      }
      return b;
    }

    public static INodeSection.INodeDirectory.Builder buildINodeDirectory(
        INodeDirectoryAttributes dir, final SaverContext state) {
      QuotaCounts quota = dir.getQuotaCounts();
      INodeSection.INodeDirectory.Builder b = INodeSection.INodeDirectory
          .newBuilder().setModificationTime(dir.getModificationTime())
          .setNsQuota(quota.getNameSpace())
          .setDsQuota(quota.getStorageSpace())
          .setPermission(buildPermissionStatus(dir));

      if (quota.getTypeSpaces().anyGreaterOrEqual(0)) {
        b.setTypeQuotas(buildQuotaByStorageTypeEntries(quota));
      }

      AclFeature f = dir.getAclFeature();
      if (f != null) {
        b.setAcl(buildAclEntries(f));
      }
      XAttrFeature xAttrFeature = dir.getXAttrFeature();
      if (xAttrFeature != null) {
        b.setXAttrs(buildXAttrs(xAttrFeature));
      }
      return b;
    }

    private final FSNamesystem fsn;
    private final FileSummary.Builder summary;
    private final SaveNamespaceContext context;
    private final FSImageFormatProtobuf.Saver parent;

    Saver(FSImageFormatProtobuf.Saver parent, FileSummary.Builder summary) {
      this.parent = parent;
      this.summary = summary;
      this.context = parent.getContext();
      this.fsn = context.getSourceNamesystem();
      this.numImageErrors = 0;
    }

    void serializeINodeDirectorySection(OutputStream out) throws IOException {
      FSDirectory dir = fsn.getFSDirectory();
      Iterator<INodeWithAdditionalFields> iter = dir.getINodeMap()
          .getMapIterator();
      final ArrayList<INodeReference> refList = parent.getSaverContext()
          .getRefList();
      int i = 0;
      int outputInodes = 0;
      while (iter.hasNext()) {
        INodeWithAdditionalFields n = iter.next();
        if (!n.isDirectory()) {
          continue;
        }

        ReadOnlyList<INode> children = n.asDirectory().getChildrenList(
            Snapshot.CURRENT_STATE_ID);
        if (children.size() > 0) {
          INodeDirectorySection.DirEntry.Builder b = INodeDirectorySection.
              DirEntry.newBuilder().setParent(n.getId());
          for (INode inode : children) {
            // Error if the child inode doesn't exist in inodeMap
            if (dir.getInode(inode.getId()) == null) {
              FSImage.LOG.error(
                  "FSImageFormatPBINode#serializeINodeDirectorySection: " +
                      "Dangling child pointer found. Missing INode in " +
                      "inodeMap: id=" + inode.getId() +
                      "; path=" + inode.getFullPathName() +
                      "; parent=" + (inode.getParent() == null ? "null" :
                      inode.getParent().getFullPathName()));
              ++numImageErrors;
            }
            if (!inode.isReference()) {
              // Serialization must ensure that children are in order, related
              // to HDFS-13693
              b.addChildren(inode.getId());
            } else {
              refList.add(inode.asReference());
              b.addRefChildren(refList.size() - 1);
            }
            outputInodes++;
          }
          INodeDirectorySection.DirEntry e = b.build();
          e.writeDelimitedTo(out);
        }

        ++i;
        if (i % FSImageFormatProtobuf.Saver.CHECK_CANCEL_INTERVAL == 0) {
          context.checkCancelled();
        }
        if (outputInodes >= parent.getInodesPerSubSection()) {
          outputInodes = 0;
          parent.commitSubSection(summary,
              FSImageFormatProtobuf.SectionName.INODE_DIR_SUB);
        }
      }
      parent.commitSectionAndSubSection(summary,
          FSImageFormatProtobuf.SectionName.INODE_DIR,
          FSImageFormatProtobuf.SectionName.INODE_DIR_SUB);
    }

    void serializeINodeSection(OutputStream out) throws IOException {
      INodeMap inodesMap = fsn.dir.getINodeMap();

      INodeSection.Builder b = INodeSection.newBuilder()
          .setLastInodeId(fsn.dir.getLastInodeId()).setNumInodes(inodesMap.size());
      INodeSection s = b.build();
      s.writeDelimitedTo(out);

      int i = 0;
      Iterator<INodeWithAdditionalFields> iter = inodesMap.getMapIterator();
      while (iter.hasNext()) {
        INodeWithAdditionalFields n = iter.next();
        save(out, n);
        ++i;
        if (i % FSImageFormatProtobuf.Saver.CHECK_CANCEL_INTERVAL == 0) {
          context.checkCancelled();
        }
        if (i % parent.getInodesPerSubSection() == 0) {
          parent.commitSubSection(summary,
              FSImageFormatProtobuf.SectionName.INODE_SUB);
        }
      }
      parent.commitSectionAndSubSection(summary,
          FSImageFormatProtobuf.SectionName.INODE,
          FSImageFormatProtobuf.SectionName.INODE_SUB);
    }

    void serializeFilesUCSection(OutputStream out) throws IOException {
      Collection<Long> filesWithUC = fsn.getLeaseManager()
              .getINodeIdWithLeases();
      for (Long id : filesWithUC) {
        INode inode = fsn.getFSDirectory().getInode(id);
        if (inode == null) {
          LOG.warn("Fail to find inode " + id + " when saving the leases.");
          continue;
        }
        INodeFile file = inode.asFile();
        if (!file.isUnderConstruction()) {
          LOG.warn("Fail to save the lease for inode id " + id
                       + " as the file is not under construction");
          continue;
        }
        String path = file.getFullPathName();
        FileUnderConstructionEntry.Builder b = FileUnderConstructionEntry
            .newBuilder().setInodeId(file.getId()).setFullPath(path);
        FileUnderConstructionEntry e = b.build();
        e.writeDelimitedTo(out);
      }
      parent.commitSection(summary,
          FSImageFormatProtobuf.SectionName.FILES_UNDERCONSTRUCTION);
    }

    private void save(OutputStream out, INode n) throws IOException {
      if (n.isDirectory()) {
        save(out, n.asDirectory());
      } else if (n.isFile()) {
        save(out, n.asFile());
      } else if (n.isSymlink()) {
        save(out, n.asSymlink());
      }
    }

    private void save(OutputStream out, INodeDirectory n) throws IOException {
      INodeSection.INodeDirectory.Builder b = buildINodeDirectory(n,
          parent.getSaverContext());
      INodeSection.INode r = buildINodeCommon(n)
          .setType(INodeSection.INode.Type.DIRECTORY).setDirectory(b).build();
      r.writeDelimitedTo(out);
    }

    private void save(OutputStream out, INodeFile n) throws IOException {
      INodeSection.INodeFile.Builder b = buildINodeFile(n,
          parent.getSaverContext());
      BlockInfo[] blocks = n.getBlocks();

      if (blocks != null) {
        for (Block block : n.getBlocks()) {
          b.addBlocks(PBHelperClient.convert(block));
        }
      }

      FileUnderConstructionFeature uc = n.getFileUnderConstructionFeature();
      if (uc != null) {
        INodeSection.FileUnderConstructionFeature f =
            INodeSection.FileUnderConstructionFeature
            .newBuilder().setClientName(uc.getClientName())
            .setClientMachine(uc.getClientMachine()).build();
        b.setFileUC(f);
      }

      INodeSection.INode r = buildINodeCommon(n)
          .setType(INodeSection.INode.Type.FILE).setFile(b).build();
      r.writeDelimitedTo(out);
    }

    private void save(OutputStream out, INodeSymlink n) throws IOException {
      INodeSection.INodeSymlink.Builder b = INodeSection.INodeSymlink
          .newBuilder()
          .setPermission(buildPermissionStatus(n))
          .setTarget(ByteString.copyFrom(n.getSymlink()))
          .setModificationTime(n.getModificationTime())
          .setAccessTime(n.getAccessTime());

      INodeSection.INode r = buildINodeCommon(n)
          .setType(INodeSection.INode.Type.SYMLINK).setSymlink(b).build();
      r.writeDelimitedTo(out);
    }

    private INodeSection.INode.Builder buildINodeCommon(INode n) {
      return INodeSection.INode.newBuilder()
          .setId(n.getId())
          .setName(ByteString.copyFrom(n.getLocalNameBytes()));
    }

    /**
     * Number of non-fatal errors detected while writing the
     * INodeSection and INodeDirectorySection sections.
     * @return the number of non-fatal errors detected.
     */
    public long getNumImageErrors() {
      return numImageErrors;
    }
  }

  private FSImageFormatPBINode() {
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码

0  赞