Java MD5Hash.equals方法代码示例

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * Load in the filesystem image from file. It's a big list of
 * filenames and blocks.
 */
private void loadFSImage(File curFile, MD5Hash expectedMd5,
    FSNamesystem target, MetaRecoveryContext recovery,
    boolean requireSameLayoutVersion) throws IOException {
  // BlockPoolId is required when the FsImageLoader loads the rolling upgrade
  // information. Make sure the ID is properly set.
  target.setBlockPoolId(this.getBlockPoolID());

  FSImageFormat.LoaderDelegator loader = FSImageFormat.newLoader(conf, target);
  loader.load(curFile, requireSameLayoutVersion);

  // Check that the image digest we loaded matches up with what
  // we expected
  MD5Hash readImageMd5 = loader.getLoadedImageMd5();
  if (expectedMd5 != null &&
      !expectedMd5.equals(readImageMd5)) {
    throw new IOException("Image file " + curFile +
        " is corrupt with MD5 checksum of " + readImageMd5 +
        " but expecting " + expectedMd5);
  }

  long txId = loader.getLoadedImageTxId();
  LOG.info("Loaded image for txid " + txId + " from " + curFile);
  lastAppliedTxId = txId;
  storage.setMostRecentCheckpointInfo(txId, curFile.lastModified());
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * This is called by the 2NN after having downloaded an image, and by
 * the NN after having received a new image from the 2NN. It
 * renames the image from fsimage_N.ckpt to fsimage_N and also
 * saves the related .md5 file into place.
 */
synchronized void saveDigestAndRenameCheckpointImage(
    long txid, MD5Hash digest) throws IOException {
  if (!digest.equals(storage.getCheckpointImageDigest(txid))) {
    throw new IOException(
        "Checkpoint image is corrupt: expecting an MD5 checksum of" +
            digest + " but is " + storage.getCheckpointImageDigest(txid));
  }
     
  imageSet.saveDigestAndRenameCheckpointImage(txid, digest);
  
  // So long as this is the newest image available,
  // advertise it as such to other checkpointers
  // from now on
  storage.setMostRecentCheckpointTxId(txid);
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * Load in the filesystem image from file. It's a big list of
 * filenames and blocks.
 */
private void loadFSImage(File curFile, MD5Hash expectedMd5,
    FSNamesystem target, MetaRecoveryContext recovery) throws IOException {
  FSImageFormat.Loader loader = new FSImageFormat.Loader(
      conf, target);
  loader.load(curFile);
  target.setBlockPoolId(this.getBlockPoolID());

  // Check that the image digest we loaded matches up with what
  // we expected
  MD5Hash readImageMd5 = loader.getLoadedImageMd5();
  if (expectedMd5 != null &&
      !expectedMd5.equals(readImageMd5)) {
    throw new IOException("Image file " + curFile +
        " is corrupt with MD5 checksum of " + readImageMd5 +
        " but expecting " + expectedMd5);
  }

  long txId = loader.getLoadedImageTxId();
  LOG.info("Loaded image for txid " + txId + " from " + curFile);
  lastAppliedTxId = txId;
  storage.setMostRecentCheckpointInfo(txId, curFile.lastModified());
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * Verify that the previously saved md5 for the given file matches
 * expectedMd5.
 * @throws IOException 
 */
public static void verifySavedMD5(File dataFile, MD5Hash expectedMD5)
    throws IOException {
  MD5Hash storedHash = readStoredMd5ForFile(dataFile);
  // Check the hash itself
  if (!expectedMD5.equals(storedHash)) {
    throw new IOException(
        "File " + dataFile + " did not match stored MD5 checksum " +
        " (stored: " + storedHash + ", computed: " + expectedMD5);
  }
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
synchronized void setCheckpointImageDigest(long txid, MD5Hash imageDigest) 
    throws IOException{
  if(checkpointImageDigests.containsKey(txid)) {
    MD5Hash existing = checkpointImageDigests.get(txid);
    if (!existing.equals(imageDigest)) {
      throw new IOException(
          "Trying to set checkpoint image digest for txid: " + txid + "="
              + imageDigest + " existing " + existing);
    }
  } else {
    checkpointImageDigests.put(txid, imageDigest);
  }
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * Roll the image.
 */
public void saveDigestAndRenameCheckpointImage(long txid, MD5Hash digest)
    throws IOException {
  MD5Hash storedDigest = checkpointImageDigests.get(txid);
  if (storedDigest == null || !storedDigest.equals(digest)) {
    throw new IOException("Digest of data written: " + storedDigest
        + " does not match requested digest: " + digest + " for txid: "
        + txid + ", journal: " + journalId);
  }
  imageManager.saveDigestAndRenameCheckpointImage(txid, digest);
  checkpointImageDigests.remove(txid);
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
synchronized void setCheckpointImageDigest(long txid, MD5Hash imageDigest)
    throws IOException {
  if (checkpointImageDigests.containsKey(txid)) {
    MD5Hash existing = checkpointImageDigests.get(txid);
    if (!existing.equals(imageDigest)) {
      throw new IOException(
          "Trying to set checkpoint image digest for txid: " + txid + "="
              + imageDigest + " existing " + existing + " for txid: " + txid
              + ", journal: " + journalId);
    }
  } else {
    checkpointImageDigests.put(txid, imageDigest);
    mostRecentCheckpointTxid = Math.max(mostRecentCheckpointTxid, txid);
  }
}
 

import org.apache.hadoop.io.MD5Hash; //导入方法依赖的package包/类
/**
 * Verify that the previously saved md5 for the given file matches
 * expectedMd5.
 *
 * @throws IOException
 */
public static void verifySavedMD5(File dataFile, MD5Hash expectedMD5)
    throws IOException {
  MD5Hash storedHash = readStoredMd5ForFile(dataFile);
  // Check the hash itself
  if (!expectedMD5.equals(storedHash)) {
    throw new IOException(
        "File " + dataFile + " did not match stored MD5 checksum " +
            " (stored: " + storedHash + ", computed: " + expectedMD5);
  }
}