How to use

readOp

method

in

org.apache.hadoop.hdfs.server.namenode.FSEditLogOp$Reader

@Override
protected FSEditLogOp nextValidOp() {
 try {
  return reader.readOp(true);
 } catch (IOException e) {
  throw new RuntimeException("got unexpected IOException " + e, e);
 }
}

@Override
protected FSEditLogOp nextOp() throws IOException {
 Preconditions.checkState(reader != null,
   "Must call setBytes() before readOp()");
 return reader.readOp(false);
}

 private void dumpRemainingEditLogs() {
  byte[] buf = this.getData();
  byte[] remainingRawEdits = Arrays.copyOfRange(buf, 0, this.size());
  ByteArrayInputStream bis = new ByteArrayInputStream(remainingRawEdits);
  DataInputStream dis = new DataInputStream(bis);
  FSEditLogLoader.PositionTrackingInputStream tracker =
    new FSEditLogLoader.PositionTrackingInputStream(bis);
  FSEditLogOp.Reader reader = FSEditLogOp.Reader.create(dis, tracker,
    NameNodeLayoutVersion.CURRENT_LAYOUT_VERSION);
  FSEditLogOp op;
  LOG.warn("The edits buffer is " + size() + " bytes long with " + numTxns +
    " unflushed transactions. " +
    "Below is the list of unflushed transactions:");
  int numTransactions = 0;
  try {
   while ((op = reader.readOp(false)) != null) {
    LOG.warn("Unflushed op [" + numTransactions + "]: " + op);
    numTransactions++;
   }
  } catch (IOException ioe) {
   // If any exceptions, print raw bytes and stop.
   LOG.warn("Unable to dump remaining ops. Remaining raw bytes: " +
     Hex.encodeHexString(remainingRawEdits), ioe);
  }
 }
}

 return nextOpImpl(skipBrokenEdits);
case OPEN:
 op = reader.readOp(skipBrokenEdits);
 if ((op != null) && (op.hasTransactionId())) {
  long txId = op.getTransactionId();

@Override
protected FSEditLogOp nextValidOp() {
 try {
  return reader.readOp(true);
 } catch (IOException e) {
  throw new RuntimeException("got unexpected IOException " + e, e);
 }
}

@Override
protected FSEditLogOp nextOp() throws IOException {
 Preconditions.checkState(reader != null,
   "Must call setBytes() before readOp()");
 return reader.readOp(false);
}

@Override
protected FSEditLogOp nextOp() throws IOException {
 Preconditions.checkState(reader != null,
   "Must call setBytes() before readOp()");
 return reader.readOp(false);
}

@Override
protected FSEditLogOp nextOp() throws IOException {
 return reader.readOp(false);
}

@Override
public FSEditLogOp readOp() throws IOException {
 return reader.readOp();
}

 return nextOpImpl(skipBrokenEdits);
case OPEN:
 op = reader.readOp(skipBrokenEdits);
 if ((op != null) && (op.hasTransactionId())) {
  long txId = op.getTransactionId();

 return nextOpImpl(skipBrokenEdits);
case OPEN:
 op = reader.readOp(skipBrokenEdits);
 if ((op != null) && (op.hasTransactionId())) {
  long txId = op.getTransactionId();

@Override
protected FSEditLogOp nextValidOp() {
 try {
  return reader.readOp(true);
 } catch (IOException e) {
  throw new RuntimeException("got unexpected IOException " + e, e);
 }
}