On 04/05/2012 03:19 PM, Joe Nyland wrote:
> On 5 Apr 2012, at 22:37, Stephen Thompson wrote:
>
>> On 04/05/2012 02:27 PM, Joe Nyland wrote:
>>> Hi,
>>>
>>> I've been using Bacula for a while now and I have a backup procedure in
>>> place for my MySQL databases, where I perform a full (dump) backup nightly,
>>> then incremental (bin log) backups every hour through the day to capture
>>> changes.
>>>
>>> I basically have a script which I have written which is run as a
>>> 'RunBeforeJob' from backup and runs either a mysqldump if the backup level
>>> is full, or flushes the bin logs if the level is incremental.
>>>
>>> I'm in the process of performing some test restores from these backups, as
>>> I would like to know the procedure is working correctly.
>>>
>>> I have no issue restoring the files from Bacula, however I'm having some
>>> issues restoring my catalog MySQL database from the binary logs created by
>>> MySQL. Specifically, I am getting messages like:
>>>
>>> ERROR 1146 (42S02) at line 105: Table 'bacula.batch' doesn't exist
>>>
>>> when I try to replay my log files against the database after it's been
>>> restore from the dump file. As far as I know the batch table is a temporary
>>> table created when inserting file attributes into the catalog during/after
>>> a backup job. I would have hoped, however, the creation of this table would
>>> have been included in either my database/earlier in my bin log.
>>>
>>> I believe this may be related to another thread on the list at the moment
>>> titled "Catalog backup while job running?" as this is, in effect what I am
>>> doing - a full database dump whilst other jobs are running, but my reason
>>> for creating a new thread is that I am not getting any errors in my backup
>>> jobs, as the OP of the other thread is - I'm simply having issues
>>> rebuilding my database after restoring the said full dump.
>>>
>>> I would like to know if anyone is currently backing up their catalog
>>> database in such a way, and if so how they are overcoming this issue when
>>> restoring. My reason for backing up my catalog using binary logging is so
>>> that I can perform a point-in-time recovery of the catalog, should I loose
>>> it.
>>>
>>
>>
>> I am not running a catalog backup in that way, but have thought about it.
>>
>> You're correct that the batch tables are temporary tables created so that
>> jobs can do batch inserts of the file attributes.
>>
>> I did run into a similar problem to yours when I had a MySQL slave server
>> out of sync with the master. The slave (much like your restore) was reading
>> through binlogs to catch up and ran into a line that referred to a batch
>> table, which didn't exist. In my case, it didn't exist because the slave
>> never saw an earlier line that created the temporary batch table.
>>
>> I would imagine something similar is going on with your restore, where you
>> are not actually applying all the changes since the Full dump (or did not
>> capture all the changes since the Full dump), because somewhere you should
>> have a line in your binlogs that create the batch table before other lines
>> refer to and try to use it.
>>
>> Also, keep in mind that theses temporary batch tables are owned by threads,
>> so if you start looking through your binlogs, you'll see many references to
>> bacula.batch, but they are not all referring to the same table. Each thread
>> is able to have it's own bacula.batch table.
>>
>>
>> Stephen
>>
>>
>>> Any input anyone can offer would be greatly appreciated.
>>>
>>> Thanks,
>>>
>>> Joe
>>
>>
>> --
>> Stephen Thompson Berkeley Seismological Laboratory
>> stephen AT seismo.berkeley DOT edu 215 McCone Hall # 4760
>> 404.538.7077 (phone) University of California, Berkeley
>> 510.643.5811 (fax) Berkeley, CA 94720-4760
>
> Hi Stephen,
>
> Thank you very much for your reply.
>
> I agree that it seems the creation of the batch table is not being captured,
> for some reason.
>
> As I think it may be useful, here's the line taken from my MySQL
> 'RunBeforeJob' script when the full backup is taken:
>
> mysqldump --all-databases --single-transaction --delete-master-logs
> --flush-logs --master-data --opt -u ${DBUSER} -p${DBPASS}>
> ${DST}/${HOST}_${DATE}_${TIME}.sql.dmp
>
> Can you spot anything there which could cause the creation of this/these
> temporary tables to not be included in the bin log? I've spent a while
> getting this list of options right and I'm not 100% sure I've got the correct
> combination, but it's possible I've missed something here.
>
Sorry, I don't think I can be much help here. I'm wrangling with
mysqldump myself at the moment since I moved from MyISAM tables to
InnoDB and the documentation is very poor.
Are you using InnoDB... If not, I'm not sure why --single-transaction
is there, and if so, I wonder if it shouldn't come after --opt. The
options order matter and since --opt is the default, having it at the
end of your line is only resetting anything you change earlier in the
line back to the --opt defaults.
Stephen
> Thanks,
>
> Joe
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--
Stephen Thompson Berkeley Seismological Laboratory
stephen AT seismo.berkeley DOT edu 215 McCone Hall # 4760
404.538.7077 (phone) University of California, Berkeley
510.643.5811 (fax) Berkeley, CA 94720-4760
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