Thanks Kern!  I'll bring in a DBA on our side to have a look.

Would you have any thoughts on this question posed earlier?

3. Why is Bacula spinning off a new job right away after it detects the deadlock for each affected job instead of waiting until the rescheduled job runs?  I verified that there were no duplicate jobs in the queue before the backups started running, no jobs were running before the start of the backups, and I did not start any of these backups manually to cause a second job to appear.

This happened on both nights I ran with Accurate turned On on the hosts that had failed backups because of the deadlock.

Regards,

-craig

On Thu, Aug 6, 2015 at 9:48 AM, Kern Sibbald <kern AT sibbald DOT com> wrote:

On 06.08.2015 21:44, Craig Shiroma wrote:

Hi Kern,

Thank you for the info!  We're using MySQL 5.6 Percona Server, Release 68.0, Revision 656.

Would this setting cause the problem?

innodb_lock_wait_timeout = 100

Is it too high or too low or has no bearing on the problem?

Sorry, I am a Bacula programmer, and I do not know much about databases -- especially MySQL since I use PostgreSQL.  PostgreSQL is harder to install and a bit harder to configure than MySQL, but it performs much better.

Thanks again,

-craig

On Thu, Aug 6, 2015 at 9:26 AM, Kern Sibbald <kern AT sibbald DOT com> wrote:

On 06.08.2015 18:46, Bryn Hughes wrote:

I think what Kern is getting at is that your database is what threw the error, not Bacula.  Whatever DB you are using is what is having the issue.

Yes.  That is exactly what I was implying. 

The rest of this is directed to Craig:
If you are using MariaDB (I have no indication that you are), please be aware that it may be a very good database, maybe even better than MySQL, but Bacula is built and tested against MySQL, and if you use binaries that were built for MySQL, you could run into problems by using MariaDB.  Even if your binaries were explicitly built with MariaDB, it may not be compatible with the way Bacula works.  Bacula has a tendency to push databases to the extreme, and it works well with MySQL and PostgreSQL, but possibly not with other databases.  I bring up MariaDB because it has been mentioned in another posting to this list.

I would be very surprised if your problem has anything to do with Accurate -- the database routines know nothing about accurate and none of the data is different.  It is more likely due to the VM environment or to some build or version problem with MySQL (or MariaDB).

Best regards,
Kern

Bryn

On 2015-08-06 09:11 AM, Craig Shiroma wrote:

Hi Kern,

Thank you very much for the reply!  Would you have any suggestions on what may be causing this problem or how I can debug it?  Obviously, I'm encountering deadlocks when accurate backup runs on some of our hosts and we want to use accurate backup on all of our hosts if possible.

Warmest regards,

-craig

On Thu, Aug 6, 2015 at 12:11 AM, Kern Sibbald <kern AT sibbald DOT com> wrote:

On 06.08.2015 10:15, Craig Shiroma wrote:

Hello again,

I just thought I'd update this post with more information in hopes of getting some explanation for the deadlocks.  

I ran with Accurate backup on our test VMs (RHEL) for a couple of days and got the same errors on some VMs that were running accurate and some that were not.  These hosts were running concurrently.  I would say 90% of the hosts that were configured to use Accurate finished successfully.  However, there were a few that failed with the deadlock error -- some that were configured to use accurate and some that were not configured to use accurate.  Also, on all of these, a second job started for each of the affected hosts right after Bacula detected the deadlock even though it said a reschedule would happen 3600 seconds later (the 3600 seconds is correct).

Tonight, I disabled accurate on all hosts and the deadlocks did not happen.  No errors were detected and all the backups finished successfully.

Some questions...

1.  Can I back up multiple hosts concurrently with some hosts configured to use accurate and some configured not to use accurate?  Or, is it an all or none thing, meaning all hosts that run concurrently must either be using accurate backup or not using accurate backup (cannot mix the two)?

2. It seems like the hosts that get out of the starting gate first are the ones affected.  I am configured to run 50 jobs concurrently.  Again, no problems with accurate turned off on all hosts for months now.

3. Why is Bacula spinning off a new job right away after it detects the deadlock for each affected job instead of waiting until the rescheduled job runs?  I verified that there were no duplicate jobs in the queue before the backups started running, no jobs were running before the start of the backups, and I did not start any of these backups manually to cause a second job to appear.

Bacula is not aware of any SQL internal deadlocks.

From the INNODB Monitor output:

TRANSACTION:

TRANSACTION 208788977, ACTIVE 1 sec setting auto-inc lock

mysql tables in use 4, locked 4

9 lock struct(s), heap size 1184, 5 row lock(s)

MySQL thread id 50808, OS thread handle 0x7f8f2c3b4700, query id 29558637 <host> 192.168.10.99 bacula Sending data

INSERT INTO File (FileIndex, JobId, PathId, FilenameId, LStat, MD5, DeltaSeq) SELECT batch.FileIndex, batch.JobId, Path.PathId, Filename.FilenameId,batch.LStat, batch.MD5, batch.DeltaSeq FROM batch JOIN Path ON (batch.Path = Path.Path) JOIN Filename ON (batch.Name = Filename.Name)

WAITING FOR THIS LOCK TO BE GRANTED:

TABLE LOCK table `bacula`.`File` trx id 208788977 lock mode AUTO-INC waiting

WE ROLL BACK TRANSACTION (2)

I am running Bacula 7.0.5 on RHEL 6.6 x64 with Director, Storage and Catalog running on separate RHEL 6.6 hosts.  Our clients are RHEL 6's, 5's and Windows Servers 2008 and 2012R2.

Any help would be much appreciated.

Warmest regards,

-craig

On Tue, Aug 4, 2015 at 1:56 PM, Craig Shiroma <shiroma.craig.2 AT gmail DOT com> wrote:

BTW, I suppose there could've been two jobs for the host(s) in scheduling queue.  If this was the case, is there a way to find out after the fact?  If this did actually happen, what could cause duplicate jobs to be scheduled on the same day at the same time?  I know no one manually ran the jobs in question.  Again, this only was a problem for a few of the jobs that ran last night, not all of them and some to do accurate backup and some not.

Regards,

-craig

On Tue, Aug 4, 2015 at 9:27 AM, Craig Shiroma <shiroma.craig.2 AT gmail DOT com> wrote:

Hello,

I had a few backups fail last night with the following error:

2015-08-03 18:02:46bacula-dir JobId 123984: b INTO File (FileIndex, JobId, PathId, FilenameId, LStat, MD5, DeltaSeq) SELECT batch.FileIndex, batch.JobId, Path.PathId, Filename.FilenameId,batch.LStat, batch.MD5, batch.DeltaSeq FROM batch JOIN Path ON (batch.Path = Path.Path) JOIN Filename ON (batch.Name = Filename.Name): ERR=Deadlock found when trying to get lock; try restarting transaction

The only thing I did yesterday was switch a bunch of backups to use Accurate backup and restart bacula-dir and bacula-sd after that.  However, the above problem also occurred on some hosts that was not set to use Accurate backup.  From the log, it seems like two jobs for this host was scheduled to run at 18:00 because the second job started and found a duplicate job (job 123984) and canceled the backup.  I know there were no jobs running before 18:00 so 123984 was not an old job still running.  Same with the other jobs that were canceled because of the above situation.

Anyway, does anyone have an idea what would cause this, especially how the second job got shot into the system.  After the deadlock error, Bacula said it would reschedule the job.  However the second job started right after the deadlock error instead of one hour later which makes me think that there were two jobs for this host scheduled to run at 18:00.

Thank you in advance,

-craig

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