Hello,
2014-05-24 18:15 GMT+02:00 Dmitri Maziuk <dmaz...@bmrb.wisc.edu>:
> On 5/24/2014 1:58 AM, Radosław Korzeniewski wrote:
> ...
> > It is the different problem. Yes, bacula could be a more robust
> > regarding network problems.
>
> I wonder how much state you'll to have keep to successfully reconnect.
> E.g. re-establishing database connection at the start of a backup job
> should be trivial, however, what if you get cut off from bacula-sd in
> the middle of a write. There are downsides to restarting the job from
> scratch.
>
There is a something like "Incomplete Job", but it is available in BEE only
(I think, could someone correct me please).
It is based on Accurete Job mechanism and allow to restart a backup job
from the last successfully written file.
To successfully implement a reconnection FD->SD (and others) you need to
design and develop a reconnection protocol which will authenticate
connection and switch it to the valid thread, which should swap a current
connection handle with a new one. Additionally this protocol should handle
a backup stream restart points, i.e. repeat the current/last file backup
(you need to know what data SD received and wrote and what data you need to
resend). Reconnecting DIR->FD connection should be simpler, because it does
not exchange any interesting data during backup (not to count
commands/status and accurate job data). For DIR->SD you need to implement
something similar to dir->fd with additional metadata information transfer
(logical sd->dir). In my opinion it is a lot of work and it was simpler for
me to implement variable block level global deduplication for Bacula then
implement above workflow. :) IMVHO.
best regards
--
Radosław Korzeniewski
rados...@korzeniewski.net
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