import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Private helper methods to save delegation keys and tokens in fsimage
 */
private synchronized void saveCurrentTokens(DataOutputStream out,
    String sdPath) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.DELEGATION_TOKENS, sdPath);
  prog.beginStep(Phase.SAVING_CHECKPOINT, step);
  prog.setTotal(Phase.SAVING_CHECKPOINT, step, currentTokens.size());
  Counter counter = prog.getCounter(Phase.SAVING_CHECKPOINT, step);
  out.writeInt(currentTokens.size());
  Iterator<DelegationTokenIdentifier> iter = currentTokens.keySet()
      .iterator();
  while (iter.hasNext()) {
    DelegationTokenIdentifier id = iter.next();
    id.write(out);
    DelegationTokenInformation info = currentTokens.get(id);
    out.writeLong(info.getRenewDate());
    counter.increment();
  }
  prog.endStep(Phase.SAVING_CHECKPOINT, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
private synchronized void saveAllKeys(DataOutputStream out, String sdPath)
    throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.DELEGATION_KEYS, sdPath);
  prog.beginStep(Phase.SAVING_CHECKPOINT, step);
  prog.setTotal(Phase.SAVING_CHECKPOINT, step, currentTokens.size());
  Counter counter = prog.getCounter(Phase.SAVING_CHECKPOINT, step);
  out.writeInt(allKeys.size());
  Iterator<Integer> iter = allKeys.keySet().iterator();
  while (iter.hasNext()) {
    Integer key = iter.next();
    allKeys.get(key).write(out);
    counter.increment();
  }
  prog.endStep(Phase.SAVING_CHECKPOINT, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Private helper methods to load Delegation tokens from fsimage
 */
private synchronized void loadCurrentTokens(DataInput in)
    throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.DELEGATION_TOKENS);
  prog.beginStep(Phase.LOADING_FSIMAGE, step);
  int numberOfTokens = in.readInt();
  prog.setTotal(Phase.LOADING_FSIMAGE, step, numberOfTokens);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
  for (int i = 0; i < numberOfTokens; i++) {
    DelegationTokenIdentifier id = new DelegationTokenIdentifier();
    id.readFields(in);
    long expiryTime = in.readLong();
    addPersistedDelegationToken(id, expiryTime);
    counter.increment();
  }
  prog.endStep(Phase.LOADING_FSIMAGE, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Private helper method to load delegation keys from fsimage.
 * @throws IOException on error
 */
private synchronized void loadAllKeys(DataInput in) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.DELEGATION_KEYS);
  prog.beginStep(Phase.LOADING_FSIMAGE, step);
  int numberOfKeys = in.readInt();
  prog.setTotal(Phase.LOADING_FSIMAGE, step, numberOfKeys);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
  for (int i = 0; i < numberOfKeys; i++) {
    DelegationKey value = new DelegationKey();
    value.readFields(in);
    addKey(value);
    counter.increment();
  }
  prog.endStep(Phase.LOADING_FSIMAGE, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Load an edit log, and apply the changes to the in-memory structure
 * This is where we apply edits that we've been writing to disk all
 * along.
 */
long loadFSEdits(EditLogInputStream edits, long expectedStartingTxId,
    StartupOption startOpt, MetaRecoveryContext recovery) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = createStartupProgressStep(edits);
  prog.beginStep(Phase.LOADING_EDITS, step);
  fsNamesys.writeLock();
  try {
    long startTime = monotonicNow();
    FSImage.LOG.info("Start loading edits file " + edits.getName());
    long numEdits = loadEditRecords(edits, false, expectedStartingTxId,
        startOpt, recovery);
    FSImage.LOG.info("Edits file " + edits.getName() 
        + " of size " + edits.length() + " edits # " + numEdits 
        + " loaded in " + (monotonicNow()-startTime)/1000 + " seconds");
    return numEdits;
  } finally {
    edits.close();
    fsNamesys.writeUnlock();
    prog.endStep(Phase.LOADING_EDITS, step);
  }
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Load cache directives from the fsimage
 */
private void loadDirectives(DataInput in) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.CACHE_ENTRIES);
  prog.beginStep(Phase.LOADING_FSIMAGE, step);
  int numDirectives = in.readInt();
  prog.setTotal(Phase.LOADING_FSIMAGE, step, numDirectives);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
  for (int i = 0; i < numDirectives; i++) {
    CacheDirectiveInfo info = FSImageSerialization.readCacheDirectiveInfo(in);
    // Get pool reference by looking it up in the map
    final String poolName = info.getPool();
    CacheDirective directive =
        new CacheDirective(info.getId(), info.getPath().toUri().getPath(),
            info.getReplication(), info.getExpiration().getAbsoluteMillis());
    addCacheDirective(poolName, directive);
    counter.increment();
  }
  prog.endStep(Phase.LOADING_FSIMAGE, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
private void loadSecretManagerSection(InputStream in, StartupProgress prog,
    Step currentStep) throws IOException {
  SecretManagerSection s = SecretManagerSection.parseDelimitedFrom(in);
  int numKeys = s.getNumKeys(), numTokens = s.getNumTokens();
  ArrayList<SecretManagerSection.DelegationKey> keys = Lists
      .newArrayListWithCapacity(numKeys);
  ArrayList<SecretManagerSection.PersistToken> tokens = Lists
      .newArrayListWithCapacity(numTokens);

  for (int i = 0; i < numKeys; ++i)
    keys.add(SecretManagerSection.DelegationKey.parseDelimitedFrom(in));

  prog.setTotal(Phase.LOADING_FSIMAGE, currentStep, numTokens);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, currentStep);
  for (int i = 0; i < numTokens; ++i) {
    tokens.add(SecretManagerSection.PersistToken.parseDelimitedFrom(in));
    counter.increment();
  }

  fsn.loadSecretManagerState(s, keys, tokens);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
private void loadCacheManagerSection(InputStream in, StartupProgress prog,
    Step currentStep) throws IOException {
  CacheManagerSection s = CacheManagerSection.parseDelimitedFrom(in);
  int numPools = s.getNumPools();
  ArrayList<CachePoolInfoProto> pools = Lists
      .newArrayListWithCapacity(numPools);
  ArrayList<CacheDirectiveInfoProto> directives = Lists
      .newArrayListWithCapacity(s.getNumDirectives());
  prog.setTotal(Phase.LOADING_FSIMAGE, currentStep, numPools);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, currentStep);
  for (int i = 0; i < numPools; ++i) {
    pools.add(CachePoolInfoProto.parseDelimitedFrom(in));
    counter.increment();
  }
  for (int i = 0; i < s.getNumDirectives(); ++i)
    directives.add(CacheDirectiveInfoProto.parseDelimitedFrom(in));
  fsn.getCacheManager().loadState(
      new CacheManager.PersistState(s, pools, directives));
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
void loadINodeSection(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);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, currentStep);
  for (int i = 0; i < numInodes; ++i) {
    INodeSection.INode p = INodeSection.INode.parseDelimitedFrom(in);
    if (p.getId() == INodeId.ROOT_INODE_ID) {
      loadRootINode(p);
    } else {
      INode n = loadINode(p);
      dir.addToInodeMap(n);
    }
    counter.increment();
  }
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Load an edit log, and apply the changes to the in-memory structure
 * This is where we apply edits that we've been writing to disk all
 * along.
 */
long loadFSEdits(EditLogInputStream edits, long expectedStartingTxId,
    StartupOption startOpt, MetaRecoveryContext recovery) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = createStartupProgressStep(edits);
  prog.beginStep(Phase.LOADING_EDITS, step);
  fsNamesys.writeLock();
  try {
    long startTime = now();
    FSImage.LOG.info("Start loading edits file " + edits.getName());
    long numEdits = loadEditRecords(edits, false, expectedStartingTxId,
        startOpt, recovery);
    FSImage.LOG.info("Edits file " + edits.getName() 
        + " of size " + edits.length() + " edits # " + numEdits 
        + " loaded in " + (now()-startTime)/1000 + " seconds");
    return numEdits;
  } finally {
    edits.close();
    fsNamesys.writeUnlock();
    prog.endStep(Phase.LOADING_EDITS, step);
  }
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Prints one line of content for a step in the Startup Progress report.
 * 
 * @param fout FormattedWriter to receive output
 * @param view StartupProgressView containing information to print
 * @param phase Phase to print
 * @param step Step to print
 * @throws IOException thrown if there is an I/O error
 */
private void printStep(FormattedWriter fout, StartupProgressView view,
    Phase phase, Step step) throws IOException {
  StringBuilder stepLine = new StringBuilder();
  String file = step.getFile();
  if (file != null) {
    stepLine.append(file);
  }
  long size = step.getSize();
  if (size != Long.MIN_VALUE) {
    stepLine.append(" (").append(StringUtils.byteDesc(size)).append(")");
  }
  StepType type = step.getType();
  if (type != null) {
    stepLine.append(" ").append(type.getDescription());
  }

  fout.println("<td class=\"startupdesc\">%s (%d/%d)</td>",
    stepLine.toString(), view.getCount(phase, step),
    view.getTotal(phase, step));
  fout.println("<td>%s</td>", StringUtils.formatPercent(
    view.getPercentComplete(phase), 2));
  fout.println("<td>%s</td>", view.getStatus(phase) == Status.PENDING ? "" :
    StringUtils.formatTime(view.getElapsedTime(phase)));
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Private helper method to load delegation keys from fsimage.
 * @param in
 * @throws IOException
 */
private synchronized void loadAllKeys(DataInput in) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = new Step(StepType.DELEGATION_KEYS);
  prog.beginStep(Phase.LOADING_FSIMAGE, step);
  int numberOfKeys = in.readInt();
  prog.setTotal(Phase.LOADING_FSIMAGE, step, numberOfKeys);
  Counter counter = prog.getCounter(Phase.LOADING_FSIMAGE, step);
  for (int i = 0; i < numberOfKeys; i++) {
    DelegationKey value = new DelegationKey();
    value.readFields(in);
    addKey(value);
    counter.increment();
  }
  prog.endStep(Phase.LOADING_FSIMAGE, step);
}
 

import org.apache.hadoop.hdfs.server.namenode.startupprogress.Step; //导入依赖的package包/类
/**
 * Load an edit log, and apply the changes to the in-memory structure
 * This is where we apply edits that we've been writing to disk all
 * along.
 */
long loadFSEdits(EditLogInputStream edits, long expectedStartingTxId,
    MetaRecoveryContext recovery) throws IOException {
  StartupProgress prog = NameNode.getStartupProgress();
  Step step = createStartupProgressStep(edits);
  prog.beginStep(Phase.LOADING_EDITS, step);
  fsNamesys.writeLock();
  try {
    long startTime = now();
    FSImage.LOG.info("Start loading edits file " + edits.getName());
    long numEdits = loadEditRecords(edits, false, 
                               expectedStartingTxId, recovery);
    FSImage.LOG.info("Edits file " + edits.getName() 
        + " of size " + edits.length() + " edits # " + numEdits 
        + " loaded in " + (now()-startTime)/1000 + " seconds");
    return numEdits;
  } finally {
    edits.close();
    fsNamesys.writeUnlock();
    prog.endStep(Phase.LOADING_EDITS, step);
  }
}