fts_solr: Indexing failed (fails on particular messages/mailboxes by timeout)

Fri Jan 15 12:10:45 EET 2021

I could find messages causing problems as solr log indeed shows the IMAP UID. 

Reducing batch_size to a single message I could identify one of those messages causing the problem. 

Now I can confirm the following behaviour: there are some SINGLE messages where 60 seconds is NOT ENOUGH to index. The message I am looking at now is 20MB big (compressed 17MB) and has a lot of inline pasted screenshots. I guess that dovecot might send those pasted images as a part of the message body to solr?

Here are some logs for better understanding:

Folder contents (single message):

> doveadm search -u u at d mailbox KS2
> e836ff1d20640160340b0000532cee39 2

Force indexing:

> doveadm index -u u at d KS2
> doveadm(u at d): Error: fts_solr: Indexing failed: Request timed out (Request queued 61.105 secs ago, 1 send attempts in 61.089 secs, 60.071 in http ioloop, 0.000 in other ioloops, connected 61.089 secs ago)
> doveadm(u at d): Error: Mailbox KS2: Transaction commit failed: FTS transaction commit failed: backend deinit

Corresponding solr logs:

> solr-mailcow_1       | 2021-01-15 10:02:34.901 INFO  (qtp524223214-2127) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[2/e836ff1d20640160340b0000532cee39/u at d (1688946475272241152)]} 0 80683

I would greatly appreciate any help. My users using pasted images heavily (designers exchanging mockups etc) and if this truly is a problem then I am screwed :) 

> On 14. Jan 2021, at 23:46, Alexey Panov <programmierus at icloud.com> wrote:
> 
> Hello, 
> 
> I am running recent dovecot 2.3.13 (89f716dc2) within dockerized mailcow setup. 
> 
> During just another update routine I decided to reindex all mailboxes and some of them fail (timeout) on exactly SAME messages in SAME mailboxes:
> 
>> doveadm(u at d): Error: fts_solr: Indexing failed: Request timed out (Request queued 73.213 secs ago, 1 send attempts in 73.098 secs, 60.597 in http ioloop, 0.000 in other ioloops, connected 127.875 secs ago)
>> doveadm(u at d): Error: Mailbox Sent: Mail search failed: Internal error occurred. Refer to server log for more information. [2021-01-14 11:23:46]
>> doveadm(u at d): Error: Mailbox Sent: Transaction commit failed: FTS transaction commit failed: backend deinit
> 
> This error is persistent and affects only some, but always same folders of same mailboxes (i mean solr can't finish indexing them at all). 
> 
> I/O is in perfect condition and has no corruptions. I also tried to do fts rescan which made no change. RAM is fine, I haven't seen OOM conditions.
> 
> During my research I found this discussion <https://www.mail-archive.com/dovecot@dovecot.org/msg76944.html> which lead me idea of reducing the batch_size to as low as 10 (for testing purposes). Observing SOLR logs during reindexing on the mailbox/folder causing the error I noticed the following strange behaviour. 
> 
> Firstly, it goes very fast but then always kinda freezes on these messages:
> 
>> solr-mailcow_1       | 2021-01-14 16:05:09.615 INFO  (qtp524223214-1151) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[6883/78a0ec27b091da5e4054000013681708/u at d (1688878773188952064), 6884/78a0ec27b091da5e4054000013681708/u at d (1688878773203632128), 6885/78a0ec27b091da5e4054000013681708/u at d (1688878773218312192), 6886/78a0ec27b091da5e4054000013681708/u at d (1688878773227749376), 6887/78a0ec27b091da5e4054000013681708/u at d (1688878773237186560), 6888/78a0ec27b091da5e4054000013681708/u at d (1688878773244526592), 6889/78a0ec27b091da5e4054000013681708/u at d (1688878773250818048), 6890/78a0ec27b091da5e4054000013681708/u at d (1688878773259206656), 6891/78a0ec27b091da5e4054000013681708/u at d (1688878773272838144), 6892/78a0ec27b091da5e4054000013681708/u at d (1688878773288566784)]} 0 101
>> solr-mailcow_1       | 2021-01-14 16:06:42.540 INFO  (qtp524223214-1143) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[6893/78a0ec27b091da5e4054000013681708/u at d (1688878773329461248), 6894/78a0ec27b091da5e4054000013681708/u at d (1688878773332606976), 6895/78a0ec27b091da5e4054000013681708/u at d (1688878774361260032), 6896/78a0ec27b091da5e4054000013681708/u at d (1688878850290745344), 6897/78a0ec27b091da5e4054000013681708/u at d (1688878851347709952), 6898/78a0ec27b091da5e4054000013681708/u at d (1688878852404674560), 6899/78a0ec27b091da5e4054000013681708/u at d (1688878853586419712), 6900/78a0ec27b091da5e4054000013681708/u at d (1688878870704422912), 6901/78a0ec27b091da5e4054000013681708/u at d (1688878870709665792), 6902/78a0ec27b091da5e4054000013681708/u at d (1688878870727491584)]} 0 92891
> 
> 
> It takes almost one and a half minute to get those ten messages (6893-6902) indexed. It freezes exactly on that position every time I restart indexing. Actually only reducing the batch_size to 10 made it through. It was timing out with the default batch_size exactly here each time. 
> 
> Than it goes further again blazing fast until it reaches here:
> 
>> solr-mailcow_1       | 2021-01-14 16:07:26.148 INFO  (qtp524223214-1151) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[7443/78a0ec27b091da5e4054000013681708/u at d (1688878884286627840), 7444/78a0ec27b091da5e4054000013681708/u at d (1688878884293967872), 7445/78a0ec27b091da5e4054000013681708/u at d (1688878884304453632), 7446/78a0ec27b091da5e4054000013681708/u at d (1688878884502634496), 7447/78a0ec27b091da5e4054000013681708/u at d (1688878900331937792), 7448/78a0ec27b091da5e4054000013681708/u at d (1688878900508098560), 7449/78a0ec27b091da5e4054000013681708/u at d (1688878916409753600), 7450/78a0ec27b091da5e4054000013681708/u at d (1688878916424433664), 7451/78a0ec27b091da5e4054000013681708/u at d (1688878916438065152), 7452/78a0ec27b091da5e4054000013681708/u at d (1688878916448550912)]} 0 30682
>> solr-mailcow_1       | 2021-01-14 16:09:40.277 INFO  (qtp524223214-1325) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[7463/78a0ec27b091da5e4054000013681708/u at d (1688879057103486976)]} 0 1
>> solr-mailcow_1       | 2021-01-14 16:10:00.628 INFO  (qtp524223214-1009) [   x:dovecot-fts] o.a.s.u.p.LogUpdateProcessorFactory [dovecot-fts]  webapp=/solr path=/update params={}{add=[7453/78a0ec27b091da5e4054000013681708/u at d (1688878916486299648), 7454/78a0ec27b091da5e4054000013681708/u at d (1688878916489445376), 7455/78a0ec27b091da5e4054000013681708/u at d (1688878916496785408), 7456/78a0ec27b091da5e4054000013681708/u at d (1688878917584158720), 7457/78a0ec27b091da5e4054000013681708/u at d (1688878994974310400), 7458/78a0ec27b091da5e4054000013681708/u at d (1688879073177108480), 7459/78a0ec27b091da5e4054000013681708/u at d (1688879074234073088), 7460/78a0ec27b091da5e4054000013681708/u at d (1688879075288940544), 7461/78a0ec27b091da5e4054000013681708/u at d (1688879076339613696), 7462/78a0ec27b091da5e4054000013681708/u at d (1688879077392384000)]} 0 154455
> 
> This results in the following error on the console where I start reindexing: 
> 
>> $ docker-compose exec dovecot-mailcow doveadm index -u u at d 'Sent'
>> doveadm(u at d): Error: fts_solr: Indexing failed: Request timed out (Request queued 134.122 secs ago, 1 send attempts in 134.098 secs, 131.923 in http ioloop, 0.000 in other ioloops, connected 376.408 secs ago)
>> doveadm(u at d): Error: Mailbox Sent: Mail search failed: Internal error occurred. Refer to server log for more information. [2021-01-14 17:09:40]
>> doveadm(u at d): Error: Mailbox Sent: Transaction commit failed: FTS transaction commit failed: backend deinit
> 
> 
> The last message about indexed block of ten messages (2021-01-14 16:10:00.628 7453-7462) arrives already after reindexing error on the other console occurs and doveadm exits. Interestingly, exactly at the time mentioned in the error message (2021-01-14 17:09:40, i.e. 16:06:40 - I don’t know why timezone differs) a message about indexing of a single message 7463 arrives (which is actually NEXT message to the block that gets indexed 20 seconds later). 
> 
> The whole mailbox consists of 8530 messages and doveadm/solr can’t finish indexing it at all starting over and over.
> 
> Can you please help me understanding the reason of this behaviour?
> 
> P.S. Is there any possibility to determine what message in vmail maildir corresponds to solr log, e.g. to 7463/78a0ec27b091da5e4054000013681708/u at d (1688879057103486976) ? 
> 
> Thanks, Programmierus

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