How to use

countBufferedBytes

method

in

org.apache.hadoop.hdfs.server.namenode.EditsDoubleBuffer

@Override // EditLogOutputStream
public void close() throws IOException {
 // close should have been called after all pending transactions 
 // have been flushed & synced.
 int size = doubleBuf.countBufferedBytes();
 if (size != 0) {
  throw new IOException("BackupEditStream has " + size +
            " records still to be flushed and cannot be closed.");
 } 
 RPC.stopProxy(backupNode); // stop the RPC threads
 doubleBuf.close();
 doubleBuf = null;
}

/**
 * Return the size of the current edit log including buffered data.
 */
@Override
long length() throws IOException {
 // file size + size of both buffers
 return fc.size() + doubleBuf.countBufferedBytes();
}

@Override // EditLogOutputStream
public void close() throws IOException {
 // close should have been called after all pending transactions 
 // have been flushed & synced.
 int size = doubleBuf.countBufferedBytes();
 if (size != 0) {
  throw new IOException("BackupEditStream has " + size +
            " records still to be flushed and cannot be closed.");
 } 
 RPC.stopProxy(backupNode); // stop the RPC threads
 doubleBuf.close();
 doubleBuf = null;
}

@Override // EditLogOutputStream
public void close() throws IOException {
 // close should have been called after all pending transactions 
 // have been flushed & synced.
 int size = doubleBuf.countBufferedBytes();
 if (size != 0) {
  throw new IOException("BackupEditStream has " + size +
            " records still to be flushed and cannot be closed.");
 } 
 RPC.stopProxy(backupNode); // stop the RPC threads
 doubleBuf.close();
 doubleBuf = null;
}

buf.writeRaw(data, 0, data.length);
assertEquals("Should count new data correctly",
  data.length, buf.countBufferedBytes());
  data.length, buf.countBufferedBytes());
assertFalse(buf.isFlushed());
assertEquals(data.length, outBuf.getLength());
assertTrue(buf.isFlushed());
assertEquals(0, buf.countBufferedBytes());
  data.length, buf.countBufferedBytes());
buf.setReadyToFlush();
buf.flushTo(outBuf);
assertEquals(0, buf.countBufferedBytes());