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53 Commits

Author SHA1 Message Date
Rafael dos Santos Silva
d59d170452
FIX: PostgreSQL fallback was broken due to Rails masking exception (#9633) 
The PR https://github.com/rails/rails/pull/36612 changes the raised exception
if the error message includes the target database name.

Since the error message contains the hostname, this could be triggered when
the hostname contains the database name.
 2020-05-05 10:34:25 +10:00
Sam Saffron
d0d5a138c3
DEV: stop freezing frozen strings 
We have the `# frozen_string_literal: true` comment on all our
files. This means all string literals are frozen. There is no need
to call #freeze on any literals.

For files with `# frozen_string_literal: true`

```
puts %w{a b}[0].frozen?
=> true

puts "hi".frozen?
=> true

puts "a #{1} b".frozen?
=> true

puts ("a " + "b").frozen?
=> false

puts (-("a " + "b")).frozen?
=> true
```

For more details see: https://samsaffron.com/archive/2018/02/16/reducing-string-duplication-in-ruby
 2020-04-30 16:48:53 +10:00
Daniel Waterworth
6924f1ab15 FIX: Race-condition in fallback handlers (#8005) 
Calling `verify_master` in multiple threads simultaneously would cause
multiple threads to be spawned.
 2019-08-21 15:47:44 +02:00
Sam Saffron
30990006a9 DEV: enable frozen string literal on all files 
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.

Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
 2019-05-13 09:31:32 +08:00
Guo Xiang Tan
c96b617bf6 FIX: Don't trigger PG failover when running db:migrate. 2019-05-06 17:03:28 +08:00
Guo Xiang Tan
bf21ebaecc DEV: Allow custom value when pausing sidekiq to aid in debugging. 
Sometimes, it is useful to know what caused Sidekiq to be paused.
 2019-02-19 10:55:53 +08:00
Guo Xiang Tan
fe92b496a7 FIX: Don't clear connections on failover. 
Clearing connections can be really slow (up to 10 seconds).
 2019-01-22 14:48:01 +08:00
Guo Xiang Tan
de197000e7 FIX: Clear connections before disabling readonly mode. 2019-01-22 14:14:13 +08:00
Guo Xiang Tan
426907cb88 FIX: Incorrect subscription in PostgreSQLFallbackHandler. 2019-01-21 17:39:31 +08:00
Guo Xiang Tan
cc83bc8fcf FIX: Avoid throwing an error when processing PG down message. 2019-01-21 11:48:54 +08:00
Guo Xiang Tan
ec58c33e9e DEV: Improve postgresql fallover and multisite tests. 2019-01-15 12:52:45 +08:00
Guo Xiang Tan
08b268c5bc Be more forceful in disconnecting connections during failover. 2018-09-04 10:32:43 +08:00
Guo Xiang Tan
7c173265d5 FIX: Don't clear connections on the same process. 2018-06-12 13:06:25 +08:00
Guo Xiang Tan
646ed87aba Clear all connections once master recovers. 2018-06-12 12:13:59 +08:00
Guo Xiang Tan
fd75e54793 Disconnect the pool during failover and fallback. 2018-06-12 11:09:19 +08:00
Guo Xiang Tan
a7be68500d Better error reporting in PostgreSQL fallover thread. 2018-06-12 09:39:11 +08:00
Guo Xiang Tan
2adae2a0b6 FIX: Be more aggressive in checking master when trying to fallback. 2018-06-12 00:09:15 +08:00
Guo Xiang Tan
c0b0c66a9e FIX: PostgreSQL fallback thread doesn't run server starts in readonly. 2018-06-11 15:23:58 +08:00
Guo Xiang Tan
d06af14c26 FIX: Notify all processes to fallback when PostgreSQL recovers. 2018-06-11 15:10:28 +08:00
Guo Xiang Tan
d192924876 FIX: Can't boot Discourse app with read-only PG connection take 2. 2018-06-11 13:25:51 +08:00
Guo Xiang Tan
5656e8f366 FIX: Can't boot Discourse with a read-only PG connection. 2018-06-11 12:29:23 +08:00
Guo Xiang Tan
a509f466a0 Expose replica_postgresql_connection to ActiveRecord::Base. 2017-11-24 09:35:45 +08:00
Guo Xiang Tan
c390169b71 Move monkey patch into freedom_patchers. 2017-11-21 14:15:11 +08:00
Guo Xiang Tan
337ccfa3a6 MONKEYPATCH: Allow us to disable the use of advisory locks during migration. 2017-11-21 14:06:22 +08:00
Guo Xiang Tan
54455fa40b Use MessageBus to get other processes to failover faster. 2017-10-23 17:58:24 +08:00
Guo Xiang Tan
7673684d91 Allow DistributedCache#delete to not publish changes. 2017-10-20 23:03:42 +08:00
Guo Xiang Tan
fe1e78ddf4 Make PostgreSQL failover work with distributed cache. 2017-10-20 17:15:29 +08:00
Guo Xiang Tan
d3003592cd Connection may be nil. 2017-10-20 12:10:03 +08:00
Guo Xiang Tan
057571d173 Raise errors in PostgreSQLFallbackHandler threads. 2017-10-20 12:06:03 +08:00
Guo Xiang Tan
24e3e321e1 Only initialize distributed cache once. 2017-10-20 07:17:41 +08:00
Guo Xiang Tan
c7402ef794 FIX: Use a distributed cache to store failover state. 2017-10-20 05:46:19 +08:00
Guo Xiang Tan
1b5ee0ae72 FIX: Couldn't boot Discourse app with a readonly postgres. 2017-10-17 13:44:30 +08:00
Guo Xiang Tan
5f76e5062d Pause Sidekiq when postgres failovers. 2017-10-16 19:48:31 +08:00
Guo Xiang Tan
d4388f54a2 FIX: Use exact patht to ensure we always redirect with the right format. 2017-09-28 10:29:41 +08:00
Guo Xiang Tan
9540b952fd Fix broken condition in PostgresqlFallbackAdapter. 2017-09-25 13:48:59 +08:00
Guo Xiang Tan
5012d46cbd Add rubocop to our build. (#5004) 2017-07-28 10:20:09 +09:00
Guo Xiang Tan
cdd550e947 Use a different Redis key when PG failover sets site to readonly mode. 2017-01-11 16:38:49 +08:00
Guo Xiang Tan
1e7de826dc FIX: Remove unused code. 2016-11-30 16:39:38 +08:00
Guo Xiang Tan
f794c25f60 FIX: Ensure a Thread is always running. 2016-11-30 16:38:21 +08:00
Guo Xiang Tan
e8a3043129 Spawn a single thread that checks for PostgreSQL fallback. 2016-11-17 13:52:08 +08:00
Guo Xiang Tan
880b7e1053
FIX: Connections were incorrectly going to master when failing over. 2016-05-30 11:50:02 +08:00
Guo Xiang Tan
86ed6c7d5e
Revert "Clear read only timestamp in Redis when switching back to master." 
This reverts commit f891430f32.
 2016-05-27 18:02:26 +08:00
Guo Xiang Tan
f891430f32
Clear read only timestamp in Redis when switching back to master. 2016-05-18 10:17:03 +08:00
Guo Xiang Tan
d783a393ec Fix randomly failing test. 2016-03-08 12:51:51 +08:00
Guo Xiang Tan
fcc86d3a9d FIX: PostgreSQLFallbackHandler was bouncing in and out of readonly. 2016-03-08 10:02:38 +08:00
Guo Xiang Tan
b41aa27a84 FEATURE: Support multisite in PostgreSQL fallback adapter. 2016-03-02 21:37:37 +08:00
Guo Xiang Tan
c344bd3fd1 FIX: Make sure we write inside a lock. 2016-02-23 23:25:59 +08:00
Guo Xiang Tan
b0d2e69cc3 FIX: Update log level to warn. 2016-02-12 15:18:34 +08:00
Guo Xiang Tan
74dc838f5f FIX: Add a lock to ensure only a single thread is running each time. 2016-02-05 10:47:47 +08:00
Guo Xiang Tan
c532d7d1ae Internally AR::Base.establish_connection removes the current connection. 2016-02-05 08:51:50 +08:00