2011/6/24 Edward J. Yoon <[email protected]> > Yes. I thought like that too but, I need more time to test. > > I'm re-scheduling it to 0.4 version. >
Right, and we need to get rid of Thread.sleep() as it theoretically doesn't guarantee anything about lock release. Tommaso > > On Wed, Jun 22, 2011 at 6:12 PM, ChiaHung Lin <[email protected]> wrote: > > From the code I observed, it seems that znodes created are consisted of > peer names only (in the form of `host:port'). Therefore, processes at > different superstep share the flat namespace. During iteration of each > supersteps, the newer superstep process can not be distinguished from the > older one, resulting in process hanging. Adding superstep value to created > znode and filtering out znode of next superstep might solve the problem. > > > > But I haven't tested the code, so I may be wrong because of > misunderstanding. > > > > -----Original message----- > > From:Edward J. Yoon <[email protected]> > > To:[email protected] > > Date:Tue, 21 Jun 2011 17:20:21 +0900 > > Subject:Re: Lock and Barrier Synchronization > > > > Especially, this can be problematic when locking a large number of > BSPPeers. > > > > On Tue, Jun 21, 2011 at 5:13 PM, Edward J. Yoon <[email protected]> > wrote: > >> Hi all, > >> > >> Recently I'm looking at HAMA-387. > >> > >> There's some problem related with lock and barrier synchronization. > >> The problem is as soon as last one of lock files deleted (before > >> completely escape from while loop at leaveBarrier method), others > >> begin to create their lock file. So, sometimes, it causes hang. > >> > >> My temporary solution is 'Thread.sleep(200);'. Good but not perfect. > >> If zk.getChildren() response is slower than 200 milliseconds, process > >> will be hanged. > >> > >> Is there any other idea? > >> > >> Thanks. > >> -- > >> Best Regards, Edward J. Yoon > >> @eddieyoon > >> > > > > > > > > -- > > Best Regards, Edward J. Yoon > > @eddieyoon > > > > > > -- > > ChiaHung Lin > > Department of Information Management > > National University of Kaohsiung > > Taiwan > > > > > > -- > Best Regards, Edward J. Yoon > @eddieyoon >
