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Subject: RE: Peer replication
Date: Mon, 29 Sep 2008 17:38:30 +0100
Message-ID: 
 <54BE2EE90AE6264986152AD195CE57A1A485DC@ibnlon02.ad.london.inspiredbroadcast.net>
Thread-Topic: Peer replication
Thread-Index: AckiSIJ6JSq3VHndRT+m4q0ERkJMtQABNqew
References: <5627810d0809290638l1c01856bg650b1d5b322580f1@mail.gmail.com>
 <48E0F4BB.7070708@sun.com>
From: "Maris Orbidans" <marios.orbidans@ingg.com>
To: "Derby Discussion" <derby-user@db.apache.org>


The=20problem=20with=20Sequoia=20is=20that=20it=20doesn't=20support=20auto=
matic=20recovery
of=20cluster=20nodes.=20=20Let's=20say=20if=20you=20reboot=20one=20of=20cl=
uster=20databases=20then
it=20won't=20join=20cluster=20when=20it's=20back.=20Then=20you=20need=20to=
=20use=20Sequoia
console=20to=20synchronize=20it=20with=20cluster.=20=20And=20it=20works=20=
only=20if=20you=20start
your=20databases=20in=20the=20reverse=20order=20they=20were=20stopped.=20O=
therwise=20it
complains=20about=20"not=20last=20down"=20and=20refuses=20to=20start.=20=20=
Even=20more=20-
sometimes=20all=20nodes=20refuses=20to=20start=20(complaining=20about=20wr=
ong=20order)=20and
there=20is=20no=20way=20to=20start=20your=20cluster.=20

But=20HA-JDBC=20supports=20automatic=20recovery=20and=20synchronization.=20=
=20I=20did=20many
tests=20trying=20to=20break=20it.=20I=20had=20a=20small=20program=20insert=
ing=20new=20records=20in
4=20Derby=20databases=20and=20at=20the=20same=20time=20I=20powered=20off/r=
ebooted=20some=20of
cluster=20nodes.=20=20HA-JDBC=20always=20synchronized=20database=20correct=
ly=20after
reboot.

I'd=20recommend=20using=20HA-JDBC.

Maris

-----Original=20Message-----
From:=20V.Narayanan@Sun.COM=20[mailto:V.Narayanan@Sun.COM]=20
Sent:=2029=20September=202008=2016:31
To:=20Derby=20Discussion
Subject:=20Re:=20Peer=20replication

Donald=20McLean=20wrote:
>=20We're=20working=20on=20an=20application=20where=20we=20have=20multiple=
=20servers=20and=20we
>=20need=20to=20replicate=20transactions=20between=20the=20servers=20to=20=
allow=20failover
>=20and=20load=20balancing.=20I=20think=20that=20this=20is=20different=20f=
rom=20the
>=20replication=20that=20Derby=20supports=20because=20it=20is=20peer-to-pe=
er=20rather=20than
>=20master/slave.=20Has=20anyone=20worked=20with=20this=20sort=20of=20repl=
ication=20before?
>
>=20Donald
>=20=20=20
Not=20sure,=20but=20would=20Sequoia=20be=20a=20good=20fit=20for=20you?

Some=20references,

http://sequoia.continuent.org/HomePage

The=20example=20in=20this=20blog=20uses=20Derby

http://blogs.sun.com/JagadishPrasath/entry/using_sequoia_with_glassfish

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