Commit Graph

181 Commits

Author SHA1 Message Date
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
Eugen Rochko
efec507230 Bump to 1.6.1 2017-09-16 03:08:29 +02:00
abcang
1aad015bbb Revert unique retry job (#4937)
* Revert "Enable UniqueRetryJobMiddleware even when called from sidekiq worker (#4836)"

This reverts commit 6859d4c028.

* Revert "Do not execute the job with the same arguments as the retry job (#4814)"

This reverts commit be7ffa2d75.
2017-09-14 15:12:43 +02:00
Eugen Rochko
ab71cf4593 Bump to 1.6.0 2017-09-10 15:10:03 +02:00
Eugen Rochko
4819e2913d Bump version to 1.6.0rc5 2017-09-10 10:26:51 +02:00
Eugen Rochko
2ff7146b6d Bump version to 1.6.0rc4 2017-09-09 14:53:49 +02:00
Eugen Rochko
dd5cb5085c Bump version to 1.6.0rc2 2017-09-06 19:02:03 +02:00
abcang
be7ffa2d75 Do not execute the job with the same arguments as the retry job (#4814) 2017-09-05 20:56:20 +02:00
Eugen Rochko
9dd8dff683 Bump version to 1.6.0rc1 (#4768) 2017-09-03 01:12:05 +02:00
Daigo 3 Dango
696c2c6f2f Add Mastodon::Source.url (#4643)
* Add Mastodon::Source.url

* Update spec

* Refactor

Move things frmo Mastodon::Source to Mastodon::Version
2017-08-22 22:54:19 +02:00
Eugen Rochko
41c3389d76 Bump to 1.5.1 2017-08-06 23:53:25 +02:00
Eugen Rochko
559fd08845 Bump to 1.5.0 2017-08-01 15:12:07 +02:00
Eugen Rochko
9b247c3d88 Bump to 1.5.0rc3 2017-07-31 15:28:36 +02:00
Eugen Rochko
fdb65dcbee Bump to 1.5.0rc2 2017-07-28 17:22:41 +02:00
Eugen Rochko
a549d1ae6b Bump to 1.5.0rc1 (#4318) 2017-07-24 16:21:08 +02:00
Eugen Rochko
b6a19e7b89 Bump version to 1.4.7 2017-06-28 17:44:17 +02:00
Eugen Rochko
7b13e6efc2 Bump version to 1.4.6 2017-06-23 17:02:14 +02:00
Eugen Rochko
1585b0c6cc Bump version to 1.4.4 2017-06-20 21:32:37 +02:00
Eugen Rochko
947887f261 Bump version to 1.4.3 2017-06-15 03:03:42 +02:00
Eugen Rochko
380b20eed6 Bump version to 1.4.2 2017-06-08 15:30:43 +02:00
Eugen Rochko
8963f8c3c2 Bump version to 1.4.1 2017-05-28 19:30:38 +02:00
Eugen Rochko
7b23f79d41 Bump version to 1.4.0.6 2017-05-28 16:32:53 +02:00
Eugen Rochko
e0e12b0fee Bump version to 1.4.0.5 2017-05-27 16:56:47 +02:00
Eugen Rochko
2d97c898f2 Bump version to 1.4.0.4 2017-05-26 14:16:04 +02:00
Eugen Rochko
b51398d0dd Bump version 2017-05-22 21:38:19 +02:00
Clworld
df92f010ad Set config.cache_store in environments file. (#3219)
* Set config.cache_store in application.rb

* Set config.cache_store in environments.

* fix code format.
2017-05-22 15:01:02 +02:00
Eugen Rochko
756db8103a Bump version to 1.4.0.2 (#3190) 2017-05-20 23:30:20 +02:00
Eugen Rochko
01e011bc90 Bump version to 1.3.2 (#2623) 2017-04-29 19:26:32 +02:00
Ash Furrow
5eef9dab80 Update version to 1.3.1 (#2571) 2017-04-28 09:07:48 -04:00
Eugen Rochko
b48c9013aa Bump version, improve how version is stored for better commit history (#2526) 2017-04-27 15:22:19 +02:00
Ash Furrow
a0ed88a99b Adds version to about/more and API (#2181)
* Adds version.

* Cleans up code.

* Removes standalone endpoint and adds version to instance endpoint.

* Addresses feedback from #2181.
2017-04-21 03:30:59 +02:00