I think NSR is good candidate here. It has leadership election for
writing data, if that can be enhanced to give more priority to SSD
bricks during leadership election.
regards
Aravinda
On 08/12/2015 06:06 PM, Ravishankar N wrote:
On 08/12/2015 05:56 PM, Anoop Nair wrote:
Hmm, that's kind of risky. What if you good leg fails before the sync
happens to the secondary leg?
Oh, the writes would still need to happen as a part of the AFR
transaction; so if the writes (which are wound to all bricks
immediately, its just that we don't wait for all responses before
unwinding to DHT ) failed on some bricks, the self-heal would take
care of it..
Thanks,
Ravi
Replay cache may serve as a lifeline in such a scenario.
Thanks
-Anoop
----- Original Message -----
From: "Ravishankar N" <ravishankar@xxxxxxxxxx>
To: "Anoop Nair" <annair@xxxxxxxxxx>, gluster-devel@xxxxxxxxxxx
Sent: Wednesday, August 12, 2015 5:46:04 PM
Subject: Re: semi-sync replication
On 08/12/2015 12:50 PM, Anoop Nair wrote:
Hi,
Do we have plans to support "semi-synchronous" type replication in
the future? By semi-sync I mean writing to one leg the replica,
securing the write on a faster stable storage (capacitor backed SSD
or NVRAM) and then acknowledge the client. The write on other
replica leg may happen at later point in time.
Not exactly in the way you describe, but there are plans to achieve
"near-synchronous" replication wherein we wind the write to all replica
legs, but acknowledge success as soon as we hear a success from one of
the bricks (instead of waiting for responses from all bricks as we do
today).
-Ravi
Thanks
-Anoop
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