So, I haven't figured out why yet, but this keeps happening on my
hosts *even though* I'm not running "BackupPC_serverMesg
BackupPC_nightly run".
As far as I know, other than "BackupPC_serverMesg server reload"
running from a script every once in a while, and having an extremely
large configuration, I'm doing nothing abnormal.
I am now running 3.2.1, so it's not an old bug; this happened to me
on two different hosts within the last couple of days.
What seems to be happening is that after a while I get:
2011-08-19 10:21:34 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:40 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:40 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:40 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:40 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:40 Botch on admin job for [host1]: already in use!!
2011-08-19 10:21:43 Botch on admin job for [host1]: already in use!!
and then after that, the nightly jobs only run one at a time until I
completely restart the server. Which I really don't want to do on
one of the servers because I'm in the middle of a 5 day backup.
This is really bad for my systems, and really frustrating. -_-
-Robin
On Wed, Nov 24, 2010 at 06:11:20PM -0800, Robin Lee Powell wrote:
>
> Figured it out. The problem was that I have BackupPC set to run 8
> nightlies at once (which usually takes 12 or more hours), but it was
> ending up in a state where only one was running at a time.
>
> This may be the longest, most detailed debugging writeup I've ever
> done in 15 years of being a computer professional; I hope y'all
> appreciate it. :) I had to do this to hold all the relevant state
> in my head.
>
> It turns out that the issue occurs when the 24-hour-ly nightlies job
> is already running, and you do
>
> sudo -u backuppc BackupPC_serverMesg BackupPC_nightly run
>
> which I've been doing a lot.
>
> Deciding to queue new nightly jobs goes like this:
>
> while ( $CmdJob eq "" && @CmdQueue > 0 && $RunNightlyWhenIdle != 1
> || @CmdQueue > 0 && $RunNightlyWhenIdle == 2
> && $bpc->isAdminJob($CmdQueue[0]->{host}) ) {
>
> We'll be coming back to this a lot. "isAdminJob" matches nightly
> jobs only AFAICT.
>
> CmdQueue State: Empty
> CmdJob: Empty
> RunNightlyWhenIdle: 0
> While State: False, since @CmdQueue <= 0
> Running Job State: Empty
> Event:
>
> Normal nightly run occurs. RunNightlyWhenIdle is set to 1, which
> triggers all the nightly jobs getting added to the queue, and
> RunNightlyWhenIdle getting set to 0
>
> CmdQueue State: 8 nightly jobs
> CmdJob: Empty
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> While State: True, via Branch 2
> Running Job State: Empty
> Event:
>
> Nightly jobs get kicked off, all 8 of them.
>
>
> CmdQueue State: Empty
> CmdJob: non-empty; "admin7" or similar
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: False
> While State: False, since @CmdQueue <= 0
> Running Job State: 8 nightly jobs
> Event:
>
> A backup finishes, and queues up a BackupPC_link job. This
> happens several times, since the nightly jobs take 8+ hours, even
> split into 8 parts, on my machine (4+TiB of backups per backup
> machine).
>
> CmdQueue State: Several link jobs
> CmdJob: non-empty; "admin7" or similar
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: False; link jobs don't match
> While State: False
> Running Job State: 8 nightly jobs
> Event:
>
> User runs "sudo -u backuppc BackupPC_serverMesg BackupPC_nightly
> run". This causes RunNightlyWhenIdle to be set to 1, but before
> that hits the while, the jobs are actually queued, *USING
> unshift*, which puts them at the front of the queue. This is
> where things start to go horribly wrong.
>
> CmdQueue State: 8 nightly jobs, *THEN* Several link jobs
> CmdJob: non-empty; "admin7" or similar
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *TRUE*
> While State: True, branch 2
> Running Job State: 8 nightly jobs
> Event:
>
> *Pop* a job from the queue. This means that even though the
> *test* is for the job from the *front* of the queue, the job that
> actually gets handled is the job at the *end* of the queue.
>
> So, the last job on the queue, a link job, gets run. THIS SHOULD
> NEVER HAPPEN, as I understand it, because nightly jobs (the first
> set) are still running. The link job sets CmdJob, but that
> doesn't matter because we're going through the *second* branch of
> the while, which doesn't care about CmdJob. So, it happily
> launches another link job:
>
> CmdQueue State: 8 nightly jobs, then N-1 link jobs
> CmdJob: hostname non-empty from the last link job
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> While State: True, branch 2
> Running Job State: 8 nightly jobs, 1 link job
> Event:
>
> Runs the next link job. And all the others. We end up with *all*
> link jobs running at once. THIS SHOULD NEVER HAPPEN; CmdQueue is
> supposed to be one at a time.
>
> But wait, it gets better!
>
> When each link job starts, it sets $CmdJob to its own host name;
> this means that at the end of the run through the queue, it's set
> to the last link job that ran, like this:
>
> CmdQueue State: 8 nightly jobs
> CmdJob: hostname from the last link job
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> While State: True, branch 2
> Running Job State: 8 nightly jobs, N link jobs
> Event:
>
> So, from here, it tries to run the last (remember, pop) nightly
> job, but it can't, because any given nightly segment can only run
> one at a time, because they are named to prevent duplicates
> (leading to the "Botch on admin job for admin7 : already in use!!"
> log messages: that means the 8th nightly job is running, so you
> can't start it again).
>
> Having failed to run the nightly job, it unshifts it onto the
> front of the CmdQueue.
>
> It runs through all the queued nightly jobs in this way.
>
> Eventually, a link job finishes.
>
> CmdQueue State: 8 nightly jobs
> CmdJob: hostname from the last link job
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> While State: True, branch 2
> Running Job State: 8 nightly jobs, N-1 link jobs
> Event:
>
> When each link job finshes, this test runs:
>
> if ( $CmdJob eq $host || $bpc->isAdminJob($host) ) {
>
> This will only match the last link job. If it doesn't match, the
> host is tested for whether it needs linking, and if so, it
> requeues the (already completed) link, *at the front of the
> queue*. This happens for all but the last link job. This means
> the thing at the front of the queue isn't a nightly job, so branch
> 2 of the while fails, which would restore some kind of order.
>
> The kicker is that the last job, the one that passes that if
> above, *clears CmdJob*, which means the first branch *passes*.
>
> CmdQueue State: N-1 link jobs, 8 nightly jobs
> CmdJob: *EMPTY*
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *FALSE*
> While State: True, *BRANCH ONE*
> Running Job State: 8 nightly jobs
> Event:
>
> It pops *the last job*, a nightly, which fails, gets requeud *at
> the front*, without setting CmdJob, and now we're back to Branch 2
> passing. This happens with all the nightly jobs, and then it's
> ready to re-run all the (already completed once) link jobs:
>
> CmdQueue State: 8 nightly jobs, N-1 link jobs
> CmdJob: Empty
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *TRUE*
> While State: True, *BRANCH TWO*
> Running Job State: 8 nightly jobs
> Event:
>
> Runs a link job.
>
> CmdQueue State: 8 nightly jobs, N-2 link jobs
> CmdJob: Empty
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *TRUE*
> While State: True, *BRANCH TWO*
> Running Job State: 8 nightly jobs, 1 link job
> Event:
>
> This keeps happening until all the link jobs have been completed
> (meaning that the last link job to finish has been run a total of
> N times):
>
> CmdQueue State: 8 nightly jobs
> CmdJob: Empty
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> Running Job State: 8 nightly jobs
> While State: True, branch 2
>
>
>
> Here's a log snippet of all this craziness:
>
> 2010-11-24 07:29:45 Running BackupPC_link host00002 (pid=26391)
> 2010-11-24 07:29:45 Running BackupPC_link host00005 (pid=26392)
> 2010-11-24 07:29:45 Running BackupPC_link hostother1 (pid=26393)
> 2010-11-24 07:29:45 Running BackupPC_link host00006 (pid=26394)
> 2010-11-24 07:29:45 Running BackupPC_link host00011 (pid=26395)
> 2010-11-24 07:29:45 Running BackupPC_link host00000 (pid=26396)
> 2010-11-24 07:29:45 Running BackupPC_link host00003 (pid=26397)
> 2010-11-24 07:29:45 Running BackupPC_link host00004 (pid=26398)
> 2010-11-24 07:29:45 Botch on admin job for admin7 : already in use!!
> 2010-11-24 07:29:45 Finished host00004 (BackupPC_link host00004)
> 2010-11-24 07:29:45 Botch on admin job for admin : already in use!!
> 2010-11-24 07:29:47 Botch on admin job for admin1 : already in use!!
> 2010-11-24 07:29:47 Botch on admin job for admin2 : already in use!!
> 2010-11-24 07:29:47 Botch on admin job for admin3 : already in use!!
> 2010-11-24 07:29:47 Botch on admin job for admin4 : already in use!!
> 2010-11-24 07:29:47 Botch on admin job for admin5 : already in use!!
> 2010-11-24 07:29:57 Botch on admin job for admin6 : already in use!!
> 2010-11-24 07:29:57 Botch on admin job for admin7 : already in use!!
> 2010-11-24 07:29:57 Running BackupPC_link host00002 (pid=26411)
> 2010-11-24 07:29:57 Running BackupPC_link host00005 (pid=26412)
> 2010-11-24 07:29:57 Running BackupPC_link hostother1 (pid=26413)
> 2010-11-24 07:29:57 Running BackupPC_link host00006 (pid=26414)
> 2010-11-24 07:29:57 Running BackupPC_link host00011 (pid=26415)
> 2010-11-24 07:29:57 Running BackupPC_link host00003 (pid=26416)
> 2010-11-24 07:29:57 Running BackupPC_link host00000 (pid=26417)
> 2010-11-24 07:29:57 Botch on admin job for admin : already in use!!
> 2010-11-24 07:29:57 Finished host00000 (BackupPC_link host00000)
> 2010-11-24 07:29:57 Botch on admin job for admin1 : already in use!!
> 2010-11-24 07:29:57 Botch on admin job for admin2 : already in use!!
> 2010-11-24 07:29:59 Botch on admin job for admin3 : already in use!!
> 2010-11-24 07:29:59 Botch on admin job for admin4 : already in use!!
> 2010-11-24 07:29:59 Botch on admin job for admin5 : already in use!!
> 2010-11-24 07:29:59 Botch on admin job for admin6 : already in use!!
> 2010-11-24 07:29:59 Botch on admin job for admin7 : already in use!!
> 2010-11-24 07:30:18 Botch on admin job for admin : already in use!!
> 2010-11-24 07:30:18 Running BackupPC_link host00002 (pid=26453)
> 2010-11-24 07:30:18 Running BackupPC_link host00005 (pid=26454)
> 2010-11-24 07:30:18 Running BackupPC_link hostother1 (pid=26455)
> 2010-11-24 07:30:18 Running BackupPC_link host00006 (pid=26456)
> 2010-11-24 07:30:18 Running BackupPC_link host00011 (pid=26457)
> 2010-11-24 07:30:18 Botch on admin job for admin1 : already in use!!
> 2010-11-24 07:30:18 Running BackupPC_link host00003 (pid=26459)
> 2010-11-24 07:30:18 Botch on admin job for admin2 : already in use!!
> 2010-11-24 07:30:18 Botch on admin job for admin3 : already in use!!
> 2010-11-24 07:30:18 Finished host00003 (BackupPC_link host00003)
>
> None of this explains why we end up with only one nightly job
> running at a time, but it's background on how very badly messed up
> things can get if you do "BackupPC_nightly run".
>
> Here's a repeat of the while, to save you some scrolling:
>
> while ( $CmdJob eq "" && @CmdQueue > 0 && $RunNightlyWhenIdle != 1
> || @CmdQueue > 0 && $RunNightlyWhenIdle == 2
> && $bpc->isAdminJob($CmdQueue[0]->{host}) ) {
>
> Ok, so, the current state is this:
>
> CmdQueue State: 8 nightly jobs
> CmdJob: Empty
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> Running Job State: 8 nightly jobs
> While State: True, branch 2
>
> So it keep running through the queue and spewing "Botch" messages
> to the logs. Then one of the nightlies *actually finishes*. This
> means one of the *other* nightlies can actually run, which sets
> CmdJob, which is our prelude to disaster.
>
> CmdQueue State: *SEVEN* nightly jobs
> CmdJob: *NON-EMPTY*; "adminN", for some N
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: True
> Running Job State: 8 nightly jobs
> While State: True, branch 2
>
> And it goes back to cycling through the nightlies and "Botch"ing.
>
> But eventually an actual backup finishes, and a link job gets
> queued *to the front*. The while is now false:
>
> CmdQueue State: 1 link job, 7 nightly jobs
> CmdJob: "adminN"
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *FALSE*
> Running Job State: 8 nightly jobs
> While State: *FALSE*, since isAdminJob is false and $CmdJob is not ""
>
> At this point, the CmdQueue will not get run until something
> changes, which is the correct behaviour when nightlies are
> running.
>
> Note that the link job that cause the while to go false does not,
> itself, actually get run.
>
> The nightlies continue to complete. Finishing a nightly DOES NOT
> chang CmdJob, so this state continues until every nightly job
> currently running has completed. Note that what's currently
> running is 7 of the original nightly jobs, and one from the second
> round.
>
> When there are 0 nightly jobs running, BackupPC considers the run
> of nightlies to be complete. At this point, it sets
> RunNightlyWhenIdle to 0 (i.e. "run normally") and sets CmdJob to
> "", so we have this:
>
> CmdQueue State: 7 nightly jobs
> CmdJob: ""
> RunNightlyWhenIdle: 0
> isAdminJob Matches First Job: *TRUE*
> Running Job State: *EMPTY*
> While State: *TRUE*, *BRANCH ONE* (CmdJob empty, and suddenly
> RunNightlyWhenIdle isn't 2 anymore)
>
> Since the while is true, it launches the last job on the queue, a
> nightly job, which leads to this state:
>
> CmdQueue State: 6 nightly jobs
> CmdJob: "adminN"
> RunNightlyWhenIdle: 0
> isAdminJob Matches First Job: True
> Running Job State: 1 nightly job
> While State: *FALSE*; RunNightlyWhenIdle isn't 2, so branch 2 can't
> be true, and CmdJob isn't "", so branch 1 can't be true
>
> No more CmdQueue checking, until the current nightly job ends. At
> that point, there are 0 nightly jobs running, which makes BackupPC
> thing everything is done, so it reports like everything is done,
> and sets CmdJob to "", which puts us back to one state above.
> Repeat until all nightly jobs are *actually* done, which leaves us
> in a proper state.
>
> The really bad part: *NO LINK JOBS RUN IN THIS STATE*.
>
> On my large hosts, each nightly job, run by itself, takes *ten or
> more hours*.
>
> This means that once we've entered this state, we've got *at least*
> 70 hours with no link jobs. A host will not run a new backup until
> the link from the last backup finishes. This means that it's very
> easy for hosts to become 2 or 3 days out of date.
>
> The daily nightlies run tries to fix it, but it doesn't actually
> work. When the daily nightly run kicks off, we end up with
> nightlies running, nightlies in the queue, and RunNightlyWhenIdle
> set to 2, which is the state we basically started in way above; it's
> only a matter of time before it gets stuck again. In my experience,
> in that case, it actually gets stuck again within a matter of
> seconds:
>
> 2010-11-25 01:00:00 Running BackupPC_nightly 224 255 (pid=25383)
> 2010-11-25 01:00:00 New BackupPCNightlyJobs counter: 2 ; new
> BackupPCNightlyLock counter: 2
> 2010-11-25 01:00:00 Running BackupPC_nightly -m 0 31 (pid=25384)
> 2010-11-25 01:00:00 New BackupPCNightlyJobs counter: 3 ; new
> BackupPCNightlyLock counter: 3
> 2010-11-25 01:00:00 Running BackupPC_nightly 32 63 (pid=25385)
> 2010-11-25 01:00:00 New BackupPCNightlyJobs counter: 4 ; new
> BackupPCNightlyLock counter: 4
> 2010-11-25 01:00:00 Running BackupPC_nightly 64 95 (pid=25386)
> 2010-11-25 01:00:00 New BackupPCNightlyJobs counter: 5 ; new
> BackupPCNightlyLock counter: 5
> 2010-11-25 01:00:00 Running BackupPC_nightly 96 127 (pid=25387)
> 2010-11-25 01:00:00 New BackupPCNightlyJobs counter: 6 ; new
> BackupPCNightlyLock counter: 6
> 2010-11-25 01:00:00 Running BackupPC_link mc00-s00106 (pid=25388)
> 2010-11-25 01:00:00 Running BackupPC_link mc00-s00009-prod-shared-redbubble
> (pid=25389)
> 2010-11-25 01:00:00 Running BackupPC_link
> mavenlink--tm25-e00053--tm25-s00106---db-backup (pid=25390)
> 2010-11-25 01:00:00 Running BackupPC_link
> provolvesolutions--tm25-e00080--tm25-s00157---data (pid=25391)
> 2010-11-25 01:00:00 Running BackupPC_link tm25-s00090__nfs (pid=25392)
> 2010-11-25 01:00:00 Running BackupPC_link
> provolvesolutions--tm25-e00079--tm25-s00155---db-backup (pid=25393)
> 2010-11-25 01:00:00 Running BackupPC_link
> mavenlink--tm25-e00054--tm25-s00107---data (pid=25394)
> 2010-11-25 01:00:00 Running BackupPC_link
> howcast--tm25-e00076--tm25-s00149---db-backup (pid=25395)
> 2010-11-25 01:00:00 Running BackupPC_link
> brighthouse--tm25-e00039--tm25-s00083---db-backup (pid=25396)
> 2010-11-25 01:00:00 Running BackupPC_link
> howcast--tm25-e00071--tm25-s00134---db-backup (pid=25397)
> 2010-11-25 01:00:00 Botch on admin job for admin : already in use!!
> 2010-11-25 01:00:00 Next wakeup is 2010-11-25 02:00:00
> 2010-11-25 01:00:00 Botch on admin job for admin1 : already in use!!
> 2010-11-25 01:00:01 Botch on admin job for admin2 : already in use!!
> 2010-11-25 01:00:02 Finished howcast--tm25-e00071--tm25-s00134---db-backup
> (BackupPC_link howcast--tm25-e00071--tm25-s00134---db-backup)
> 2010-11-25 01:00:02 Botch on admin job for admin3 : already in use!!
> 2010-11-25 01:00:07 Running BackupPC_nightly 128 159 (pid=25414)
> 2010-11-25 01:00:07 New BackupPCNightlyJobs counter: 7 ; new
> BackupPCNightlyLock counter: 7
>
> So *some of* the nightlies ran, and set RunNightlyWhenIdle to 2,
> which caused all the links to kick off for reasons explained above,
> leaving the queue with just the nightly jobs.
>
> The non-last links finish, leaving a link job at the front of the
> queue.
>
> Then a link finishes, leaving CmdJob empty.
>
> Then another nightly job runs, setting CmdJob, so we end up with:
>
> CmdQueue State: some number of nightly jobs
> CmdJob: "adminN"
> RunNightlyWhenIdle: 2
> isAdminJob Matches First Job: *FALSE*
> Running Job State: some number of nightly job
> While State: *FALSE*
>
> And round and round she goes. Total progress in 24 hours from
> BackupPC's point of view: *one link job*.
>
> It can keep doing this *forever*, as each 24-hour-ly run of
> nightlies restarts the problem, unless all the sequential nightlies
> can finish within 24 hours, which is *most definitely* not the case
> here.
>
> SOLUTION(S). TOTALLY UNTESTED.
>
> 1. Don't run a non-nightly job from the CmdQueue when there are
> nightly job running, *EVER*. (my copy is locally modified with
> debugging stuff to try to figure out these issues, so if this diff
> doesn't patch, that's why, sorry).
>
> --- /var/tmp/BackupPC 2010-11-25 01:52:30.000000000 +0000
> +++ /usr/local/bin/BackupPC 2010-11-25 02:00:03.000000000 +0000
> @@ -522,6 +522,15 @@
> $req = pop(@CmdQueue);
>
> $host = $req->{host};
> +
> + if( $BackupPCNightlyJobs > 0 && ! $bpc->isAdminJob($host) )
> + {
> + print(LOG $bpc->timeStamp, "Tried to run ".$req->{cmd}." on
> $host when there are nightlies running. That's bad.\n");
> +
> + unshift(@CmdQueue, $req);
> + return;
> + }
> +
> if ( defined($Jobs{$host}) ) {
> print(LOG $bpc->timeStamp,
> "Botch on admin job for $host: already in use!!\n");
>
>
> 2. That means that if nightlies are running, and you do a
> "BackupPC_nightly run", it'll queue them, 8 at a time total, behind
> the previous ones, which means the whole run will take about twice
> as long as it would have otherwise. I don't know about you, but
> that's certainly not what *I* expect when I launch a nightly run; I
> expect all the old ones to die in favour of new ones:
>
> @@ -1362,7 +1371,19 @@
> } elsif ( $cmd =~ /^backup all$/ ) {
> QueueAllPCs();
> } elsif ( $cmd =~ /^BackupPC_nightly run$/ ) {
> + print(LOG $bpc->timeStamp,
> + "Running nightlies at user request.\n" );
> + foreach my $host (keys %Jobs) {
> + if( $bpc->isAdminJob( $host ) ) {
> + my $pid = $Jobs{$host}{pid};
> + kill($bpc->sigName2num("INT"), $pid);
> + print(LOG $bpc->timeStamp,
> + "Killing nightly job $host with PID $pid to make way
> for manual run.\n");
> + }
> + }
> $RunNightlyWhenIdle = 1;
> + $BackupPCNightlyJobs = 0;
> + $BackupPCNightlyLock = 0;
> } elsif ( $cmd =~ /^backup (\S+)\s+(\S+)\s+(\S+)\s+(\S+)/ ) {
> my $hostIP = $1;
> $host = $2;
>
> -Robin
>
> --
> http://singinst.org/ : Our last, best hope for a fantastic future.
> Lojban (http://www.lojban.org/): The language in which "this parrot
> is dead" is "ti poi spitaki cu morsi", but "this sentence is false"
> is "na nei". My personal page: http://www.digitalkingdom.org/rlp/
>
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