add block handler to handle block files on different under file systems[Tachyon-33][SubTask 1]

resubmitted.
Ah, missed that.  Alright
On Aug 28, 2014 9:40 AM, "shimingfei" <notifications@github.com> wrote:

> In core/src/main/java/tachyon/client/BlockHandlerLocal.java:
>
> > +import java.util.Deque;
> > +
> > +import org.apache.log4j.Logger;
> > +
> > +import com.google.common.base.Preconditions;
> > +
> > +import tachyon.Constants;
> > +import tachyon.util.CommonUtils;
> > +
> > +/**
> > + * BlockHandler for files on LocalFS, such as RamDisk, SSD and HDD.
> > + */
> > +public final class BlockHandlerLocal extends BlockHandler {
> > +
> > +  private final Logger LOG = Logger.getLogger(Constants.LOGGER_TYPE);
> > +  private final RandomAccessFile mLocalFile;
>
> @dcapwell <https://github.com/dcapwell>
> no, it is used in read() to get file length.
>
> —
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> <https://github.com/amplab/tachyon/pull/395/files#r16851710>.
>