[TACHYON-115] Share client threads

Use a fixed threadpool per file system for the heartbeat threads.  
When did we move these to a new line?  Or did I miss something else in the
comment?
On Sep 17, 2014 11:56 AM, "Haoyuan Li" <notifications@github.com> wrote:

> In core/src/main/java/tachyon/HeartbeatThread.java:
>
> > @@ -43,17 +40,11 @@ public void run() {
> >            Thread.sleep(mFixedExecutionIntervalMs - executionTimeMs);
> >          }
> >        }
> > -    } catch (InterruptedException e) {
> > -      if (!mIsShutdown) {
> > -        LOG.error("Heartbeat Thread was interrupted ungracefully, shutting down...", e);
> > -      }
> > +    } catch(InterruptedException e) {
>
> catch (InterruptedException e) {
>
> —
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> <https://github.com/amplab/tachyon/pull/399/files#r17685503>.
>