La restauration échoue, se bloque, expire lors de ALTER TABLE

deargle · Avril 2, 2021, 11:43

I had a disk failure on a discourse server, and I’m trying to restore a backup from S3 onto an AWS EC2 t2.small instance. Consistently getting the below error.

Using this flow:

git clone https://github.com/discourse/discourse_docker /var/discourse

I’m using this app.yml

./launcher bootstrap app
./launcher start app

Then I scp the backup, ./launcher enter app, discourse enable_restore discourse restore <the file>.

Then this happens, beginning truncated:

14
(1 row)
setval
--------
1
(1 row)
setval
--------
1
(1 row)
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
ALTER TABLE
 #<Thread:0x0000562604925448 /var/www/discourse/lib/sidekiq/pausable.rb:79 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
        33: from /var/www/discourse/lib/sidekiq/pausable.rb:83:in `block (2 levels) in extend_lease_thread'
        32: from /var/www/discourse/lib/sidekiq/pausable.rb:83:in `synchronize'
        31: from /var/www/discourse/lib/sidekiq/pausable.rb:84:in `block (3 levels) in extend_lease_thread'
        30: from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each'
        29: from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each_key'
        28: from /var/www/discourse/lib/sidekiq/pausable.rb:85:in `block (4 levels) in extend_lease_thread'
        27: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rails_multisite-2.5.0/lib/rails_multisite/connection_management.rb:76:in `with_connection'
        26: from /var/www/discourse/lib/sidekiq/pausable.rb:86:in `block (5 levels) in extend_lease_thread'
        25: from /var/www/discourse/lib/discourse_redis.rb:59:in `block (2 levels) in <class:DiscourseRedis>'
        24: from /var/www/discourse/lib/discourse_redis.rb:29:in `ignore_readonly'
        23: from /var/www/discourse/lib/discourse_redis.rb:59:in `block (3 levels) in <class:DiscourseRedis>'
        22: from /var/www/discourse/lib/discourse_redis.rb:59:in `public_send'
        21: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:425:in `expire'
        20: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:69:in `synchronize'
        19: from /usr/local/lib/ruby/2.7.0/monitor.rb:202:in `mon_synchronize'
        18: from /usr/local/lib/ruby/2.7.0/monitor.rb:202:in `synchronize'
        17: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:69:in `block in synchronize'
        16: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:426:in `block in expire'
        15: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rack-mini-profiler-2.3.1/lib/mini_profiler/profiling_methods.rb:85:in `block in profile_method'
        14: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:131:in `call'
        13: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:237:in `process'
        12: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:325:in `logging'
        11: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:238:in `block in process'
        10: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:389:in `ensure_connected'
         9: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:248:in `block (2 levels) in process'
         8: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:131:in `block in call'
         7: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:279:in `read'
         6: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:268:in `io'
         5: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:280:in `block in read'
         4: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:378:in `read'
         3: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:45:in `gets'
         2: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:52:in `_read_from_socket'
         1: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:52:in `loop'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:56:in `block in _read_from_socket': Redis::TimeoutError (Redis::TimeoutError)
        33: from /var/www/discourse/lib/sidekiq/pausable.rb:83:in `block (2 levels) in extend_lease_thread'
        32: from /var/www/discourse/lib/sidekiq/pausable.rb:83:in `synchronize'
        31: from /var/www/discourse/lib/sidekiq/pausable.rb:84:in `block (3 levels) in extend_lease_thread'
        30: from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each'
        29: from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each_key'
        28: from /var/www/discourse/lib/sidekiq/pausable.rb:85:in `block (4 levels) in extend_lease_thread'
        27: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rails_multisite-2.5.0/lib/rails_multisite/connection_management.rb:76:in `with_connection'
        26: from /var/www/discourse/lib/sidekiq/pausable.rb:86:in `block (5 levels) in extend_lease_thread'
        25: from /var/www/discourse/lib/discourse_redis.rb:59:in `block (2 levels) in <class:DiscourseRedis>'
        24: from /var/www/discourse/lib/discourse_redis.rb:29:in `ignore_readonly'
        23: from /var/www/discourse/lib/discourse_redis.rb:59:in `block (3 levels) in <class:DiscourseRedis>'
        22: from /var/www/discourse/lib/discourse_redis.rb:59:in `public_send'
        21: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:425:in `expire'
        20: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:69:in `synchronize'
        19: from /usr/local/lib/ruby/2.7.0/monitor.rb:202:in `mon_synchronize'
        18: from /usr/local/lib/ruby/2.7.0/monitor.rb:202:in `synchronize'
        17: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:69:in `block in synchronize'
        16: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis.rb:426:in `block in expire'
        15: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/rack-mini-profiler-2.3.1/lib/mini_profiler/profiling_methods.rb:85:in `block in profile_method'
        14: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:131:in `call'
        13: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:237:in `process'
        12: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:325:in `logging'
        11: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:238:in `block in process'
        10: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:389:in `ensure_connected'
         9: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:248:in `block (2 levels) in process'
         8: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:131:in `block in call'
         7: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:279:in `read'
         6: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:268:in `io'
         5: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/client.rb:280:in `block in read'
         4: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:378:in `read'
         3: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:45:in `gets'
         2: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:52:in `_read_from_socket'
         1: from /var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:52:in `loop'
/var/www/discourse/vendor/bundle/ruby/2.7.0/gems/redis-4.2.5/lib/redis/connection/ruby.rb:56:in `block in _read_from_socket': Connection timed out (Redis::TimeoutError)
^[[A  ^[[A^[[B       server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
connection to server was lost
EXCEPTION: psql failed: connection to server was lost

Consistently, the process will reach this far into the restore process, then hang on that last (85th) ALTER TABLE. I extracted my backup’s dump.sql, and the 85th is, if I’m counting right, this “public.reviewables” one:

Any idea from the above what might be going wrong?

deargle · Avril 3, 2021, 12:57

Je pense avoir trouvé la solution. J’aurais dû exécuter ./discourse-setup une fois sur le nouvel hôte pour (1) créer un fichier d’échange et (2) définir des db_shared_buffers cohérents. L’une de ces deux erreurs, ou peut-être les deux, était à l’origine du plantage systématique.

pfaffman · Avril 3, 2021, 1:03

Bonne trouvaille ! Bienvenue à nouveau et bienvenue au club « répondre à sa propre question » ! J’ai tout un tas de ces sujets, même si je suis sûr que beaucoup ont été supprimés.

L’autre option serait de copier le fichier app.yml, mais il vous aurait quand même fallu vous souvenir de l’échange. À part ce souci d’échange, le fichier yml est tout ce dont vous avez besoin si la configuration S3 se trouve dans le yml.

Ravi de vous revoir en ligne !

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La restauration échoue, se bloque, expire lors de ALTER TABLE

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