Restauração falha, trava, expira no ALTER TABLE

deargle · Abril 2, 2021, 11:43pm

Tive uma falha de disco em um servidor Discourse e estou tentando restaurar um backup do S3 em uma instância AWS EC2 t2.small. Estou recebendo consistentemente o erro abaixo.

Usando este fluxo:

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

Estou usando este app.yml

./launcher bootstrap app
./launcher start app

Em seguida, faço o scp do backup, ./launcher enter app, discourse enable_restore, discourse restore <o arquivo>.

Então isso acontece, começando truncado:

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

Consistentemente, o processo chega até esse ponto no processo de restauração e depois trava na última (85ª) ALTER TABLE. Extraí o dump.sql do meu backup e, se estou contando certo, a 85ª é esta do „public.reviewables":

Alguma ideia, com base no acima, do que pode estar dando errado?

deargle · Abril 3, 2021, 12:57am

Acho que descobri. Deveria ter executado ./discourse-setup uma vez no novo host para (1) criar um arquivo de swap e (2) definir um valor razoável para db_shared_buffers. Um desses dois, ou talvez ambos, estava causando a falha consistente.

pfaffman · Abril 3, 2021, 1:03am

Bom trabalho! Bem-vindo de volta e bem-vindo ao clube “responda à sua própria pergunta”! Tenho um monte desses tópicos, embora tenha certeza de que muitos foram excluídos.

A outra coisa seria copiar o app.yml, mas você ainda teria que se lembrar da troca. Exceto pelo problema da troca, o arquivo yml é tudo o que você precisa se a configuração do S3 estiver no yml.

Fico feliz que você esteja de volta!

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Restauração falha, trava, expira no ALTER TABLE

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