/** Sets the offset in the block to which the the next write will write data to. */
public void setChannelPosition(Block b, BlockWriteStreams streams, long dataOffset, long ckOffset)
throws IOException {
long size = 0;
synchronized (this) {
FSVolume vol = volumeMap.get(b).getVolume();
size = vol.getTmpFile(b).length();
}
if (size < dataOffset) {
String msg =
"Trying to change block file offset of block "
+ b
+ " to "
+ dataOffset
+ " but actual size of file is "
+ size;
throw new IOException(msg);
}
FileOutputStream file = (FileOutputStream) streams.dataOut;
file.getChannel().position(dataOffset);
file = (FileOutputStream) streams.checksumOut;
file.getChannel().position(ckOffset);
}
/** Retrieves the offset in the block to which the the next write will write data to. */
public long getChannelPosition(Block b, BlockWriteStreams streams) throws IOException {
FileOutputStream file = (FileOutputStream) streams.dataOut;
return file.getChannel().position();
}
