[TACHYON-123] throw exceptions rather than close connection

There may be more cases that should be fixed, and this doesn't solve the problem if there are network issues, but I rather move those to a different PR.
I'll clean up
On Aug 30, 2014 12:53 AM, "Haoyuan Li" <notifications@github.com> wrote:

> In core/src/test/java/tachyon/master/MasterClientTest.java:
>
> >  import tachyon.thrift.InvalidPathException;
> > +import tachyon.thrift.MasterService;
>
> where is this used?
>
> —
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> <https://github.com/amplab/tachyon/pull/404/files#r16928636>.
>