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From: "ChiaHung Lin" <chl501@nuk.edu.tw>
Reply-To: chl501@nuk.edu.tw
Subject: Re: Lock and Barrier Synchronization
Message-ID: <1308733928.29538.chl501@nuk.edu.tw>
In-Reply-To: <BANLkTikQ6FWqbmuBtopaXJS+TNUtQJcqHA@mail.gmail.com>
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	<BANLkTikQ6FWqbmuBtopaXJS+TNUtQJcqHA@mail.gmail.com>
To: "hama-dev" <hama-dev@incubator.apache.org>
Date: Wed, 22 Jun 2011 17:12:08 +0800 (CST)
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From=20the=20code=20I=20observed,=20it=20seems=20that=20znodes=20created=20a=
re=20consisted=20of=20peer=20names=20only=20(in=20the=20form=20of=20`host:po=
rt').=20Therefore,=20processes=20at=20different=20superstep=20share=20the=20=
flat=20namespace.=20During=20iteration=20of=20each=20supersteps,=20the=20new=
er=20superstep=20process=20can=20not=20be=20distinguished=20from=20the=20old=
er=20one,=20resulting=20in=20process=20hanging.=20Adding=20superstep=20value=
=20to=20created=20znode=20and=20filtering=20out=20znode=20of=20next=20supers=
tep=20might=20solve=20the=20problem.=20

But=20I=20haven't=20tested=20the=20code,=20so=20I=20may=20be=20wrong=20becau=
se=20of=20misunderstanding.=20=20

-----Original=20message-----
From:Edward=20J.=20Yoon=20<edwardyoon@apache.org>
To:hama-dev@incubator.apache.org
Date:Tue,=2021=20Jun=202011=2017:20:21=20+0900
Subject:Re:=20Lock=20and=20Barrier=20Synchronization

Especially,=20this=20can=20be=20problematic=20when=20locking=20a=20large=20n=
umber=20of=20BSPPeers.

On=20Tue,=20Jun=2021,=202011=20at=205:13=20PM,=20Edward=20J.=20Yoon=20<edwar=
dyoon@apache.org>=20wrote:
>=20Hi=20all,
>
>=20Recently=20I'm=20looking=20at=20HAMA-387.
>
>=20There's=20some=20problem=20related=20with=20lock=20and=20barrier=20synch=
ronization.
>=20The=20problem=20is=20as=20soon=20as=20last=20one=20of=20lock=20files=20d=
eleted=20(before
>=20completely=20escape=20from=20while=20loop=20at=20leaveBarrier=20method),=
=20others
>=20begin=20to=20create=20their=20lock=20file.=20So,=20sometimes,=20it=20cau=
ses=20hang.
>
>=20My=20temporary=20solution=20is=20'Thread.sleep(200);'.=20Good=20but=20no=
t=20perfect.
>=20If=20zk.getChildren()=20response=20is=20slower=20than=20200=20millisecon=
ds,=20process
>=20will=20be=20hanged.
>
>=20Is=20there=20any=20other=20idea?
>
>=20Thanks.
>=20--
>=20Best=20Regards,=20Edward=20J.=20Yoon
>=20@eddieyoon
>


--=20
Best=20Regards,=20Edward=20J.=20Yoon
@eddieyoon


--
ChiaHung=20Lin
Department=20of=20Information=20Management
National=20University=20of=20Kaohsiung
Taiwan