CardinalityViolation exceptions, database corruption?

barthalion · February 5, 2020, 11:46am

Recently this started popping out on GNOME’s Discourse deployment:

/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.4/lib/patches/db/pg.rb:69:in `exec_params'
/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.4/lib/patches/db/pg.rb:69:in `exec_params'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:672:in `block (2 levels) in exec_no_cache'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:671:in `block in exec_no_cache'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:718:in `block (2 levels) in log'
/usr/local/lib/ruby/2.6.0/monitor.rb:235:in `mon_synchronize'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:717:in `block in log'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/notifications/instrumenter.rb:24:in `instrument'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract_adapter.rb:708:in `log'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:670:in `exec_no_cache'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `execute_and_clear'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/postgresql/database_statements.rb:98:in `exec_query'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:487:in `select'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:70:in `select_all'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/query_cache.rb:105:in `block in select_all'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/query_cache.rb:123:in `block in cache_sql'
/usr/local/lib/ruby/2.6.0/monitor.rb:235:in `mon_synchronize'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/query_cache.rb:114:in `cache_sql'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/query_cache.rb:105:in `select_all'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/querying.rb:46:in `find_by_sql'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:810:in `block in exec_queries'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:828:in `skip_query_cache_if_necessary'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:797:in `exec_queries'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:615:in `load'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:250:in `records'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation.rb:245:in `to_ary'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation/finder_methods.rb:528:in `find_nth_with_limit'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation/finder_methods.rb:513:in `find_nth'
/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/relation/finder_methods.rb:120:in `first'
/discourse/app/services/post_alerter.rb:173:in `first_unread_post'
/discourse/app/services/post_alerter.rb:360:in `create_notification'
/discourse/app/services/post_alerter.rb:615:in `block in notify_post_users'
/discourse/app/services/post_alerter.rb:613:in `each'
/discourse/app/services/post_alerter.rb:613:in `notify_post_users'
/discourse/app/services/post_alerter.rb:97:in `after_save_post'
/discourse/app/jobs/regular/post_alert.rb:11:in `execute'
/discourse/app/jobs/base.rb:232:in `block (2 levels) in perform'
/discourse/vendor/bundle/ruby/2.6.0/gems/rails_multisite-2.0.7/lib/rails_multisite/connection_management.rb:63:in `with_connection'
/discourse/app/jobs/base.rb:221:in `block in perform'
/discourse/app/jobs/base.rb:217:in `each'
/discourse/app/jobs/base.rb:217:in `perform'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:196:in `execute_job'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:164:in `block (2 levels) in process'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/middleware/chain.rb:138:in `block in invoke'
/discourse/lib/sidekiq/pausable.rb:138:in `call'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/middleware/chain.rb:140:in `block in invoke'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/middleware/chain.rb:143:in `invoke'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:163:in `block in process'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:136:in `block (6 levels) in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/job_retry.rb:111:in `local'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:135:in `block (5 levels) in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/rails.rb:43:in `block in call'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/execution_wrapper.rb:88:in `wrap'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/reloader.rb:72:in `block in wrap'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/execution_wrapper.rb:88:in `wrap'
/discourse/vendor/bundle/ruby/2.6.0/gems/activesupport-6.0.1/lib/active_support/reloader.rb:71:in `wrap'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/rails.rb:42:in `call'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:131:in `block (4 levels) in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:257:in `stats'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:126:in `block (3 levels) in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/job_logger.rb:13:in `call'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:125:in `block (2 levels) in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/job_retry.rb:78:in `global'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:124:in `block in dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/logger.rb:10:in `with'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/job_logger.rb:33:in `prepare'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:123:in `dispatch'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:162:in `process'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:78:in `process_one'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/processor.rb:68:in `run'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/util.rb:15:in `watchdog'
/discourse/vendor/bundle/ruby/2.6.0/gems/sidekiq-6.0.4/lib/sidekiq/util.rb:24:in `block in safe_thread'

Env tab:

hostname	[sidekiq-35-2zhwc, sidekiq-35-4999r, sidekiq-35-m4rbw]
process_id	1
application_version	8a89b7e108b9f0c56dfe5506e04275024da5e310
current_db	default
current_hostname	discourse.gnome.org
job	Jobs::PostAlert
problem_db	default
time	Su 11:29 am
	
opts	null
post_id	8065
new_record	true
current_site_id	default

Now I’m not really sure what the actual query is. select id from posts where id = 8065; returns just one result.

I know our deployment isn’t really supported as we use custom image, but the error seems “generic” enough.

sam · February 6, 2020, 12:32am

I am guessing here, but the cardinality error is on post_number, it is meant to be unique by topic. My guess is you have a corrupt index there. I guess a fix could be to find the offending post and renumber it.

https://github.com/discourse/discourse/blob/a84c493de2fb4e048f7e642a20050b6eb16383cd/app/models/post.rb#L1147-L1148

codinghorror · February 6, 2020, 10:32am

Now maybe you can understand why we only support standard installs, perhaps?

There’s a method to our madness, but your personal madness is something you get the privilege of fully owning all by yourself …

barthalion · February 6, 2020, 1:30pm

Thanks a lot. Started poking around database some more and it’s clearly corrupted. Many posts had the same post_number or sort_order, there were also IDs visible via select * from posts where topic_id = x but not if I added and id = y.

@Jeff, I’ve never said I don’t understand your decision! I wouldn’t ask for help if it was anything deployment-specific.

system · March 7, 2020, 1:30pm

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CardinalityViolation exceptions, database corruption?

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