no full syncs after upgrading to dovecot 2.3.18
Arnaud Abélard
arnaud.abelard at univ-nantes.fr
Mon Apr 25 13:13:13 UTC 2022
Hello,
On my side we are running Linux (Debian Buster).
I'm not sure my problem is actually the same as Paul or you Sebastian
since I have a lot of boxes but those are actually small (quota of
110MB) so I doubt any of them have more than a dozen imap folders.
The main symptom is that I have tons of full sync requests awaiting but
even though no other sync is pending the replicator just waits for
something to trigger those syncs.
Today, with users back I can see that normal and incremental syncs are
being done on the 15 connections, with an occasional full sync here or
there and lots of "Waiting 'failed' requests":
Queued 'sync' requests 0
Queued 'high' requests 0
Queued 'low' requests 0
Queued 'failed' requests 122
Queued 'full resync' requests 28785
Waiting 'failed' requests 4294
Total number of known users 42512
So, why didn't the replicator take advantage of the weekend to replicate
the mailboxes while no user were using them?
Arnaud
On 25/04/2022 13:54, Sebastian Marske wrote:
> Hi there,
>
> thanks for your insights and for diving deeper into this Paul!
>
> For me, the users ending up in 'Waiting for dsync to finish' all have
> more than 256 Imap folders as well (ranging from 288 up to >5500; as per
> 'doveadm mailbox list -u <username> | wc -l'). For more details on my
> setup please see my post from February [1].
>
> @Arnaud: What OS are you running on?
>
>
> Best
> Sebastian
>
>
> [1] https://dovecot.org/pipermail/dovecot/2022-February/124168.html
>
>
> On 4/24/22 19:36, Paul Kudla (SCOM.CA Internet Services Inc.) wrote:
>>
>> Question having similiar replication issues
>>
>> pls read everything below and advise the folder counts on the
>> non-replicated users?
>>
>> i find the total number of folders / account seems to be a factor and
>> NOT the size of the mail box
>>
>> ie i have customers with 40G of emails no problem over 40 or so folders
>> and it works ok
>>
>> 300+ folders seems to be the issue
>>
>> i have been going through the replication code
>>
>> no errors being logged
>>
>> i am assuming that the replication --> dhclient --> other server is
>> timing out or not reading the folder lists correctly (ie dies after X
>> folders read)
>>
>> thus i am going through the code patching for log entries etc to find
>> the issues.
>>
>> see
>>
>> [13:33:57] mail18.scom.ca [root:0] /usr/local/var/lib/dovecot
>> # ll
>> total 86
>> drwxr-xr-x 2 root wheel uarch 4B Apr 24 11:11 .
>> drwxr-xr-x 4 root wheel uarch 4B Mar 8 2021 ..
>> -rw-r--r-- 1 root wheel uarch 73B Apr 24 11:11 instances
>> -rw-r--r-- 1 root wheel uarch 160K Apr 24 13:33 replicator.db
>>
>> [13:33:58] mail18.scom.ca [root:0] /usr/local/var/lib/dovecot
>> #
>>
>> replicator.db seems to get updated ok but never processed properly.
>>
>> # sync.users
>> nick at elirpa.com high 00:09:41 463:47:01 - y
>> keith at elirpa.com high 00:09:23 463:45:43 - y
>> paul at scom.ca high 00:09:41 463:46:51 - y
>> ed at scom.ca high 00:09:43 463:47:01 - y
>> ed.hanna at dssmgmt.com high 00:09:42 463:46:58 - y
>> paul at paulkudla.net high 00:09:44 463:47:03 580:35:07
>> y
>>
>>
>>
>>
>> so ....
>>
>>
>>
>> two things :
>>
>> first to get the production stuff to work i had to write a script that
>> whould find the bad sync's and the force a dsync between the servers
>>
>> i run this every five minutes or each server.
>>
>> in crontab
>>
>> */10 * * * * root /usr/bin/nohup
>> /programs/common/sync.recover > /dev/null
>>
>>
>> python script to sort things out
>>
>> # cat /programs/common/sync.recover
>> #!/usr/local/bin/python3
>>
>> #Force sync between servers that are reporting bad?
>>
>> import os,sys,django,socket
>> from optparse import OptionParser
>>
>>
>> from lib import *
>>
>> #Sample Re-Index MB
>> #doveadm -D force-resync -u paul at scom.ca -f INBOX*
>>
>>
>>
>> USAGE_TEXT = '''\
>> usage: %%prog %s[options]
>> '''
>>
>> parser = OptionParser(usage=USAGE_TEXT % '', version='0.4')
>>
>> parser.add_option("-m", "--send_to", dest="send_to", help="Send Email To")
>> parser.add_option("-e", "--email", dest="email_box", help="Box to Index")
>> parser.add_option("-d", "--detail",action='store_true',
>> dest="detail",default =False, help="Detailed report")
>> parser.add_option("-i", "--index",action='store_true',
>> dest="index",default =False, help="Index")
>>
>> options, args = parser.parse_args()
>>
>> print (options.email_box)
>> print (options.send_to)
>> print (options.detail)
>>
>> #sys.exit()
>>
>>
>>
>> print ('Getting Current User Sync Status')
>> command = commands("/usr/local/bin/doveadm replicator status '*'")
>>
>>
>> #print command
>>
>> sync_user_status = command.output.split('\n')
>>
>> #print sync_user_status
>>
>> synced = []
>>
>> for n in range(1,len(sync_user_status)) :
>> user = sync_user_status[n]
>> print ('Processing User : %s' %user.split(' ')[0])
>> if user.split(' ')[0] != options.email_box :
>> if options.email_box != None :
>> continue
>>
>> if options.index == True :
>> command = '/usr/local/bin/doveadm -D force-resync -u %s
>> -f INBOX*' %user.split(' ')[0]
>> command = commands(command)
>> command = command.output
>>
>> #print user
>> for nn in range (len(user)-1,0,-1) :
>> #print nn
>> #print user[nn]
>>
>> if user[nn] == '-' :
>> #print 'skipping ... %s' %user.split(' ')[0]
>>
>> break
>>
>>
>>
>> if user[nn] == 'y': #Found a Bad Mailbox
>> print ('syncing ... %s' %user.split(' ')[0])
>>
>>
>> if options.detail == True :
>> command = '/usr/local/bin/doveadm -D
>> sync -u %s -d -N -l 30 -U' %user.split(' ')[0]
>> print (command)
>> command = commands(command)
>> command = command.output.split('\n')
>> print (command)
>> print ('Processed Mailbox for ... %s'
>> %user.split(' ')[0] )
>> synced.append('Processed Mailbox for ...
>> %s' %user.split(' ')[0])
>> for nnn in range(len(command)):
>> synced.append(command[nnn] + '\n')
>> break
>>
>>
>> if options.detail == False :
>> #command = '/usr/local/bin/doveadm -D
>> sync -u %s -d -N -l 30 -U' %user.split(' ')[0]
>> #print (command)
>> #command = os.system(command)
>> command = subprocess.Popen(
>> ["/usr/local/bin/doveadm sync -u %s -d -N -l 30 -U" %user.split(' ')[0]
>> ], \
>> shell = True, stdin=None, stdout=None,
>> stderr=None, close_fds=True)
>>
>> print ( 'Processed Mailbox for ... %s'
>> %user.split(' ')[0] )
>> synced.append('Processed Mailbox for ...
>> %s' %user.split(' ')[0])
>> #sys.exit()
>> break
>>
>> if len(synced) != 0 :
>> #send email showing bad synced boxes ?
>>
>> if options.send_to != None :
>> send_from = 'monitor at scom.ca'
>> send_to = ['%s' %options.send_to]
>> send_subject = 'Dovecot Bad Sync Report for : %s'
>> %(socket.gethostname())
>> send_text = '\n\n'
>> for n in range (len(synced)) :
>> send_text = send_text + synced[n] + '\n'
>>
>> send_files = []
>> sendmail (send_from, send_to, send_subject, send_text,
>> send_files)
>>
>>
>>
>> sys.exit()
>>
>> second :
>>
>> i posted this a month ago - no response
>>
>> please appreciate that i am trying to help ....
>>
>> after much testing i can now reporduce the replication issues at hand
>>
>> I am running on freebsd 12 & 13 stable (both test and production servers)
>>
>> sdram drives etc ...
>>
>> Basically replication works fine until reaching a folder quantity of ~
>> 256 or more
>>
>> to reproduce using doveadm i created folders like
>>
>> INBOX/folder-0
>> INBOX/folder-1
>> INBOX/folder-2
>> INBOX/folder-3
>> and so forth ......
>>
>> I created 200 folders and they replicated ok on both servers
>>
>> I created another 200 (400 total) and the replicator got stuck and would
>> not update the mbox on the alternate server anymore and is still
>> updating 4 days later ?
>>
>> basically replicator goes so far and either hangs or more likely bails
>> on an error that is not reported to the debug reporting ?
>>
>> however dsync will sync the two servers but only when run manually (ie
>> all the folders will sync)
>>
>> I have two test servers avaliable if you need any kind of access - again
>> here to help.
>>
>> [07:28:42] mail18.scom.ca [root:0] ~
>> # sync.status
>> Queued 'sync' requests 0
>> Queued 'high' requests 6
>> Queued 'low' requests 0
>> Queued 'failed' requests 0
>> Queued 'full resync' requests 0
>> Waiting 'failed' requests 0
>> Total number of known users 255
>>
>> username type status
>> paul at scom.ca normal Waiting for dsync to finish
>> keith at elirpa.com incremental Waiting for dsync to finish
>> ed.hanna at dssmgmt.com incremental Waiting for dsync to finish
>> ed at scom.ca incremental Waiting for dsync to finish
>> nick at elirpa.com incremental Waiting for dsync to finish
>> paul at paulkudla.net incremental Waiting for dsync to finish
>>
>>
>> i have been going through the c code and it seems the replication gets
>> requested ok
>>
>> replicator.db does get updated ok with the replicated request for the
>> mbox in question.
>>
>> however i am still looking for the actual replicator function in the
>> lib's that do the actual replication requests
>>
>> the number of folders & subfolders is defanately the issue - not the
>> mbox pyhsical size as thought origionally.
>>
>> if someone can point me in the right direction, it seems either the
>> replicator is not picking up on the number of folders to replicat
>> properly or it has a hard set limit like 256 / 512 / 65535 etc and stops
>> the replication request thereafter.
>>
>> I am mainly a machine code programmer from the 80's and have
>> concentrated on python as of late, 'c' i am starting to go through just
>> to give you a background on my talents.
>>
>> It took 2 months to finger this out.
>>
>> this issue also seems to be indirectly causing the duplicate messages
>> supression not to work as well.
>>
>> python programming to reproduce issue (loops are for last run started @
>> 200 - fyi) :
>>
>> # cat mbox.gen
>> #!/usr/local/bin/python2
>>
>> import os,sys
>>
>> from lib import *
>>
>>
>> user = 'paul at paulkudla.net'
>>
>> """
>> for count in range (0,600) :
>> box = 'INBOX/folder-%s' %count
>> print count
>> command = '/usr/local/bin/doveadm mailbox create -s -u %s %s'
>> %(user,box)
>> print command
>> a = commands.getoutput(command)
>> print a
>> """
>>
>> for count in range (0,600) :
>> box = 'INBOX/folder-0/sub-%' %count
>> print count
>> command = '/usr/local/bin/doveadm mailbox create -s -u %s %s'
>> %(user,box)
>> print command
>> a = commands.getoutput(command)
>> print a
>>
>>
>>
>> #sys.exit()
>>
>>
>>
>>
>>
>> Happy Sunday !!!
>> Thanks - paul
>>
>> Paul Kudla
>>
>>
>> Scom.ca Internet Services <http://www.scom.ca>
>> 004-1009 Byron Street South
>> Whitby, Ontario - Canada
>> L1N 4S3
>>
>> Toronto 416.642.7266
>> Main 1.866.411.7266
>> Fax 1.888.892.7266
>>
>> On 4/24/2022 10:22 AM, Arnaud Abélard wrote:
>>> Hello,
>>>
>>> I am working on replicating a server (and adding compression on the
>>> other side) and since I had "Error: dsync I/O has stalled, no activity
>>> for 600 seconds (version not received)" errors I upgraded both source
>>> and destination server with the latest 2.3 version (2.3.18). While
>>> before the upgrade all the 15 replication connections were busy after
>>> upgrading dovecot replicator dsync-status shows that most of the time
>>> nothing is being replicated at all. I can see some brief replications
>>> that last, but 99,9% of the time nothing is happening at all.
>>>
>>> I have a replication_full_sync_interval of 12 hours but I have
>>> thousands of users with their last full sync over 90 hours ago.
>>>
>>> "doveadm replicator status" also shows that i have over 35,000 queued
>>> full resync requests, but no sync, high or low queued requests so why
>>> aren't the full requests occuring?
>>>
>>> There are no errors in the logs.
>>>
>>> Thanks,
>>>
>>> Arnaud
>>>
>>>
>>>
>>>
>>>
--
Arnaud Abélard
Responsable pôle Système et Stockage
Service Infrastructures
DSIN Université de Nantes
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