In theory ,it could do some help.
On Sat, Jun 5, 2010 at 9:10 PM, Jonathan Ellis <jbel...@gmail.com> wrote:
> From what I have read, allowing the reference to be GC'd itself is
> equivalent to calling clear. Does adding clear() make an observable
> difference?
>
> On Sat, Jun 5, 2010 at 1:31 AM, Anty <anty....@gmail.com> wrote:
> > ---------- Forwarded message ----------
> > From: Anty <anty....@gmail.com>
> > Date: Sat, Jun 5, 2010 at 4:30 PM
> > Subject: PhantomReference in Cassandra
> > To: u...@cassandra.apache.org, chukwa-dev <chukwa-...@hadoop.apache.org>
> >
> >
> > Hi:All
> > in the code of SSTableReader.java
> > private static final ReferenceQueue<SSTableReader> finalizerQueue = new
> > ReferenceQueue<SSTableReader>()
> > {{
> > Runnable runnable = new Runnable()
> > {
> > public void run()
> > {
> > while (true)
> > {
> > SSTableDeletingReference r = null;
> > try
> > {
> > r = (SSTableDeletingReference)
> > finalizerQueue.remove();
> > finalizers.remove(r);
> > }
> > catch (InterruptedException e)
> > {
> > throw new RuntimeException(e);
> > }
> > try
> > {
> > r.cleanup();
> > }
> > catch (IOException e)
> > {
> > logger.error("Error deleting " + r.path, e);
> > }
> > }
> > }
> > };
> > new Thread(runnable, "SSTABLE-DELETER").start();
> > }};
> >
> >
> > the PhantomReference SSTableDeletingReference's cleanup() method doesn't
> > invoked clear() method inherited from Reference, whichi clear the phantom
> > reference to the referent.
> > but,the GC enqueues the PhantomReference onto ReferenceQueue before the
> > phantom reference clears. Is it necessary to invoke the clear() method
> after
> > r.clearup() or add clear() method in cleanup() method to accelerate the
> GC
> > process.
> > try
> > {
> > r.cleanup();
> > r.clear();
> >
> > }
> > catch (IOException e)
> > {
> > logger.error("Error deleting " + r.path, e);
> > }
> > --
> > Best Regards
> > Anty Rao
> >
> >
> >
> > --
> > Best Regards
> > Anty Rao
> >
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>
--
Best Regards
Anty Rao
