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Re: [Bacula-devel] Copy jobs in Bacula version 3.0.0


Hello,

On Tue, 2008-12-16 at 12:41 +0200, Pasi Kärkkäinen wrote:
> On Mon, Dec 15, 2008 at 09:52:39PM +0100, Kern Sibbald wrote:
> > Hello,
> > 
> > I've been discussing with Eric how we might handle Copy jobs in our 
> > development version.  Currently, Copy jobs are implemented, and they work 
> > much like Migration jobs (share 99% of the code).  The difference is that 
> > Migration jobs purge the original backup job and keep only the Migrated data.  
> > With a Copy Job, the original backup job remains and there is a 
> > second "identical" job that contains the copied data.  The only difference 
> > between the original and the Copy job is that they will be in different 
> > Pools.
> > 
> > Now this poses a few problems for doing restores such as:
> > 
> > 1. It is possible that a simple restore will choose JobIds from both the 
> > original and the Copy Job.
> > 
> > 2. There is no easy mechanism for the user to select whether he/she wants to 
> > restore from the original backup or the Copy (or Copies).
> > 
> > So for the moment, the situation is not really satisfactory (one of the 
> > reasons the code is not yet released).
> > 
> > We have a number of ideas for different ways to solve the above problems, many 
> > have already been discussed on the mailing lists, and we will probably 
> > implement a number of the ideas put forward, either before or after the 
> > release (depending on the time we have and the complexity of the proposal -- 
> > e.g. using the Location table and Costs ...).
> > 

first solution should be simple (seen from the users side)
media selection for restore
 5: Select the most recent backup for a client
should not require job selections.

i thought about sql order by based on PriorJobId,  currently
there is no order in uar_last_full and uar_last_diff.
selection is a bit more complicated for the incr jobs.

const char *uar_last_full =
   "INSERT INTO temp1 SELECT Job.JobId,JobTdate "
   "FROM Client,Job,JobMedia,Media,FileSet WHERE Client.ClientId=%s "
   "AND Job.ClientId=%s "
   "AND Job.StartTime<'%s' "
   "AND Level='F' AND JobStatus='T' AND Type IN ('B','C') "
   "AND JobMedia.JobId=Job.JobId "
   "AND Media.Enabled=1 "
   "AND JobMedia.MediaId=Media.MediaId "
   "AND Job.FileSetId=FileSet.FileSetId "
   "AND FileSet.FileSet='%s' "
   "%s"
   "ORDER BY Job.JobTDate DESC,Job.PriorJobId ASC LIMIT 1";

assumptions:
  JobId's are incremented over time.
  only original backup jobs have PriorJobId=0

> > A few things seem obvious:
> > 
> > 1. Any restore where Bacula automatically selects the jobs to be restored 
> > (e.g. a restore to the current state -- #5 on the restore prompt menu) should 
> > be done by default using the original backups.
> >
> 
> .. if they're still available. 
> 
> I'm using Bacula to backup to disk, and then after the backup-to-disk job I copy from disk
> volumes to tapes. 
> 
> Backups are stored on disk volumes for X days, and after that disk volumes are recycled/reused.
> Backups are stored on tapes for much longer time before they're recycled.
> 

same way i am using it

one question about that:

what happens to Job.PriorJobId when the original job is recycled and
completely removed from Catalog?


> > 2. If a job has been copied, Bacula should probably display an information 
> > message during the restore that indicates that the JobIds to be used have 
> > Copies.
> >
> 
> Yep.
>  
> > 3. The restore command should allow the user to select any Copy job or jobs.
> > 
> 
> Definitely.
> 
> > 
> > I propose that we modify the Jobs to look like the following:
> > 
> > +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
> > | JobId | Name         | StartTime           | Type | Level | JobFiles | 
> > +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
> > | 1     | CopyJobSave  | 2008-12-15 20:38:28 | B    | F     | 7020     | 
> > | 5     | CopyJobSave  | 2008-12-15 20:38:28 | C    | F     | 7020     | 
> > | 2     | CopyJobSave  | 2008-12-15 20:38:32 | B    | I      | 999     | 
> > | 6     | CopyJobSave  | 2008-12-15 20:38:32 | C    | I      | 999     | 
> > | 3     | copy-job     | 2008-12-15 20:41:05 | c    | F     | 0        | 
> > | 4     | copy-job     | 2008-12-15 20:41:50 | c    | F     | 0        | 
> > | 8     | RestoreFiles | 2008-12-15 20:42:39 | R    | F     | 7020     | 
> > +-------+--------------+---------------------+------+-------+----------+-----------+-----------+
> > 
> > Now here, JobIds 5 and 6 no longer appear to Bacula like they are Backup jobs, 
> > rather they are marked as Type=C (i.e. a Copy job), and so they will never be 
> > considered for restoration by default.  I've give the Copy control jobs the 
> > Type 'c' to distinguish them from the real copy -- they exist just to record 
> > the actual time the copy was made.
> > 
> 
> Looks good.
> 
> > Now by modifying the restore code in Bacula, we should be able to provide 
> > features that allow the user to know that there is a Copy of JobId 1 (i.e. 5) 
> > and a copy of JobId 2 (i.e. 6) and allow him/her to choose which copy to use.
> > 
> > In my opinion, this would simplify future handling of Copy jobs allowing a lot 
> > more flexibility and avoiding confusion.  However, it will cause some minor 
> > changes (nothing serious, I believe) for users already using the new code.
> > 
> 
> That's not a problem.. something we need to deal with.. being beta-testers:)
> 
> > 
> > Note, instead of selecting pairs (original Job, Copy), since all the jobids 
> > are unique, you could simply just type in the desired jobids.  For the above 
> > example: 7,6,3,4. 
> > 
> > Any comments?
> > 
> 
> Thanks for working with this!
> 

I agree!

Ulrich

> -- Pasi
> 
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-- 
Ulrich Leodolter <ulrich.leodolter@xxxxxxxx>
OBVSG


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