Commit Graph

23 Commits

Author SHA1 Message Date
Daniel Hunsaker cf7e840990 Update model annotations to use BIGINT for IDs (#5461)
All the migrations have been updated to use BIGINTs for ID fields in the DB, but ActiveRecord needs to be told to treat those values as BIGINT as well. This PR does that.
2017-11-12 16:18:50 +01:00
aschmitz 97c02c3389 Make IdsToBigints (mostly!) non-blocking (#5088)
* Make IdsToBigints (mostly!) non-blocking

This pulls in GitLab's MigrationHelpers, which include code to make
column changes in ways that Postgres can do without locking. In general,
this involves creating a new column, adding an index and any foreign
keys as appropriate, adding a trigger to keep it populated alongside
the old column, and then progressively copying data over to the new
column, before removing the old column and replacing it with the new
one.

A few changes to GitLab's MigrationHelpers were necessary:

* Some changes were made to remove dependencies on other GitLab code.
* We explicitly wait for index creation before forging ahead on column
  replacements.
* We use different temporary column names, to avoid running into index
  name length limits.
* We rename the generated indices back to what they "should" be after
  replacing columns.
* We rename the generated foreign keys to use the new column names when
  we had to create them. (This allows the migration to be rolled back
  without incident.)

# Big Scary Warning

There are two things here that may trip up large instances:

1. The change for tables' "id" columns is not concurrent. In
   particular, the stream_entries table may be big, and does not
   concurrently migrate its id column. (On the other hand, x_id type
   columns are all concurrent.)
2. This migration will take a long time to run, *but it should not
   lock tables during that time* (with the exception of the "id"
   columns as described above). That means this should probably be run
   in `screen` or some other session that can be run for a long time.
   Notably, the migration will take *longer* than it would without
   these changes, but the website will still be responsive during that
   time.

These changes were tested on a relatively large statuses table (256k
entries), and the service remained responsive during the migration.
Migrations both forward and backward were tested.

* Rubocop fixes

* MigrationHelpers: Support ID columns in some cases

This doesn't work in cases where the ID column is referred to as a
foreign key by another table.

* MigrationHelpers: support foreign keys for ID cols

Note that this does not yet support foreign keys on non-primary-key
columns, but Mastodon also doesn't yet have any that we've needed to
migrate.

This means we can perform fully "concurrent" migrations to change ID
column types, and the IdsToBigints migration can happen with effectively
no downtime. (A few operations require a transaction, such as renaming
columns or deleting them, but these transactions should not block for
noticeable amounts of time.)

The algorithm for generating foreign key names has changed with this,
and therefore all of those changed in schema.rb.

* Provide status, allow for interruptions

The MigrationHelpers now allow restarting the rename of a column if it
was interrupted, by removing the old "new column" and re-starting the
process.

Along with this, they now provide status updates on the changes which
are happening, as well as indications about when the changes can be
safely interrupted (when there are at least 10 seconds estimated to be
left before copying data is complete).

The IdsToBigints migration now also sorts the columns it migrates by
size, starting with the largest tables. This should provide
administrators a worst-case scenario estimate for the length of
migrations: each successive change will get faster, giving admins a
chance to abort early on if they need to run the migration later. The
idea is that this does not force them to try to time interruptions
between smaller migrations.

* Fix column sorting in IdsToBigints

Not a significant change, but it impacts the order of columns in the
database and db/schema.rb.

* Actually pause before IdsToBigints
2017-10-02 21:28:59 +02:00
yhirano 298796cc7b annotate models (#2697)
* add annotate to Gemfile

* rails g annotate:install

* configure annotate_models

* add schema info to models

* fix rubocop to add frozen_string_literal
2017-05-02 02:14:47 +02:00
alpaca-tc 630de52fdd Required foreign keys (#2003)
* Add `required: true` option to foreign column

* Fixes NoMethodError

```
> Favourite.new.valid?
NoMethodError: undefined method `reblog?' for nil:NilClass
```
2017-04-17 15:54:33 +02:00
Eugen Rochko de22c202f5 Add counter caches for a large performance increase on API requests 2017-03-30 15:06:59 +02:00
Eugen Rochko 0518492158 Stop trying to shoehorn all Salmon updates into the poor database-connected
StreamEntry model. Simply render Salmon slaps as they are needed
2017-02-12 01:19:14 +01:00
Eugen Rochko 50660d54e8 Fix semantics of follow requests another slaps 2017-02-11 17:13:11 +01:00
Eugen Rochko 149887a0ff Make follow requests federate 2017-02-11 02:58:00 +01:00
Eugen Rochko 77e13c2bc9 Removing failed push notification API, make context loads use cache 2017-02-05 17:51:44 +01:00
Eugen Rochko 8b94d283fb Fix wrong person being notified after nested reblog call, fix favourites leaking private toots in Atom feeds 2016-12-28 13:21:12 +01:00
Eugen Rochko 3caf0cfb03 Ensure that reblogs and favs always refer to the original status rather than a reblog wrapper 2016-12-22 11:34:05 +01:00
Eugen Rochko e8c27767aa Remove orphaned notifications, add scopes param to app create API 2016-11-21 14:59:13 +01:00
Eugen Rochko fdc17bea58 Fix rubocop issues, introduce usage of frozen literal to improve performance 2016-11-15 16:56:29 +01:00
Eugen Rochko b13e7dda1f API pagination for all collections using Link header 2016-11-09 17:48:44 +01:00
Eugen Rochko 0160d1d9b5 Enable caching for some rabl views 2016-11-03 13:28:36 +01:00
Eugen Rochko 188c6f326b Making public pages responsive, removing reblogs/favs counts from them 2016-10-03 00:26:00 +02:00
Eugen Rochko 927333f4f8 Improve code style 2016-09-29 21:28:21 +02:00
Eugen Rochko 595c8dda60 Favouriting works, reblogging is a little broken because of <Status> 2016-09-01 13:21:48 +02:00
Eugen Rochko 10ba09f546 Upgrade to Rails 5.0.0.1 2016-08-17 17:58:00 +02:00
Eugen Rochko a08e724476 Fix subscriptions:clear task, refactor feeds, refactor streamable activites
and atom feed generation to some extent, as well as the way mentions are
stored
2016-03-25 02:13:30 +01:00
Eugen Rochko 086d487145 Fix unfollows 2016-03-16 21:14:39 +01:00
Eugen Rochko fa7868675d Send Salmon interactions 2016-02-24 12:57:29 +01:00
Eugen Rochko fa33750105 Adding reblogs, favourites, improving atom generation 2016-02-23 19:17:37 +01:00