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From Emmanuel L├ęcharny <elecha...@gmail.com>
Subject Fwd: Fwd: Replica duplicates detection...
Date Mon, 14 Jan 2013 06:49:08 GMT
Forwarded, as Kiran seems not to be able to send this mail to the ML


---------- Forwarded message ----------
From: Kiran Ayyagari <kayyagari@apache.org>
Date: Mon, Jan 14, 2013 at 9:58 AM
Subject: Re: Replica duplicates detection...
To: Apache Directory Developers List <dev@directory.apache.org>




On Sun, Jan 13, 2013 at 7:33 PM, Emmanuel L├ęcharny <elecharny@gmail.com>wrote:

> Hi !
>
> what should we do if we get a replication request from a host we already
> know, with the same search filter, but an empty cookie ?
>
> We have two cases here :
>
> 1) We already have a connected consumer from this host with the given
> search filter
> It's very likely the consumer has been disconnected, but we haven't yet
> noticed the disconnection. However, it may also be another consumer on
> the same host...
>
> Should we consider it's a new consumer ? I bet so...

yes

> 2) We don't have a connected consumer from this host
> Most certainly, the consumer is trying to reconnect. ATM, we create a
> new ReplicaEventLog, and we consider that's a new consumer. We keep the
> old journal and create a new journal.
>
> Won't it be better to consider that it's the same consumer ? Should'nt
> we reset the old journal?

there is no way to detect if it is the same consumer or not, so we must
create a new journal/event log

> OTOH we *may* have ore than once consumer on the same host, so e may
> want to have more than one journal... In any case, we will eventually
> detect that the disconnected consumer is dead, and we will remove the
> old journal.

yup

> I do think that in this case, keeping the journal is probably necessary,
> assuming we have a mechanism that get rd of it after a period of
> inactivity, and without a reconnection from the consumer (ie, a
> connection with a valid cookie).

yes


-- 
Kiran Ayyagari
http://keydap.com




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