升级失败，出现“重复键值违反唯一约束”错误

morevnaproject · 2020 年2 月 27 日 10:54

Hi!

Today I tried to upgrade my Discourse instance from “2.1.0.beta6” to latest one - “2.5.0.beta1”.

But web upgrade failed in the middle and after that my server displayed recommendation to update by executing ./launcher rebuild app.

I did that, but upgrade failed with error:

root@cloud:/var/discourse# ./launcher rebuild synfig-forums
Ensuring launcher is up to date
Fetching origin
Launcher is up-to-date
Stopping old container
+ /usr/bin/docker stop -t 10 synfig-forums
synfig-forums
cd /pups && git pull && /pups/bin/pups --stdin
Already up to date.
...
Bundle complete! 124 Gemfile dependencies, 157 gems now installed.
Gems in the groups test and development were not installed.
Bundled gems are installed into `./vendor/bundle`

I, [2020-02-27T10:37:49.176136 #1]  INFO -- : > cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate'
2020-02-27 10:38:06.784 UTC [414] discourse@discourse ERROR:  duplicate key value violates unique constraint "index_poll_options_on_poll_id_and_digest"
2020-02-27 10:38:06.784 UTC [414] discourse@discourse DETAIL:  Key (poll_id, digest)=(30, 399fc6670871474cd7ce0458401fd299) already exists.
2020-02-27 10:38:06.784 UTC [414] discourse@discourse STATEMENT:  INSERT INTO poll_options
	  (poll_id, digest, html, anonymous_votes, created_at, updated_at)
	VALUES
	  (30, '399fc6670871474cd7ce0458401fd299', '<ul>
	<li>
	</li>
	</ul>', 0, '2018-07-30 12:09:10 UTC', '2018-07-30 12:09:10 UTC'),(30, '59f25e0e204428418f22b441698f25dd', '**', 0, '2018-07-30 12:09:10 UTC', '2018-07-30 12:09:10 UTC'),(30, '399fc6670871474cd7ce0458401fd299', '<hr>', 0, '2018-07-30 12:09:10 UTC', '2018-07-30 12:09:10 UTC'),(30, '399fc6670871474cd7ce0458401fd299', '<hr>', 0, '2018-07-30 12:09:10 UTC', '2018-07-30 12:09:10 UTC'),(30, '399fc6670871474cd7ce0458401fd299', '<hr>', 0, '2018-07-30 12:09:10 UTC', '2018-07-30 12:09:10 UTC')
	RETURNING digest, id
	
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

ERROR:  duplicate key value violates unique constraint "index_poll_options_on_poll_id_and_digest"
DETAIL:  Key (poll_id, digest)=(30, 399fc6670871474cd7ce0458401fd299) already exists.
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.6/lib/patches/db/pg.rb:110:in `exec'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.6/lib/patches/db/pg.rb:110:in `async_exec'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mini_sql-0.2.4/lib/mini_sql/postgres/connection.rb:118:in `run'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mini_sql-0.2.4/lib/mini_sql/postgres/connection.rb:55:in `query_single'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:131:in `block (2 levels) in up'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:87:in `each'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:87:in `block in up'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:64:in `each'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:64:in `up'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:831:in `exec_migration'
/var/www/discourse/lib/freedom_patches/schema_migration_details.rb:9:in `block in exec_migration'
/var/www/discourse/lib/freedom_patches/schema_migration_details.rb:8:in `exec_migration'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:812:in `block (2 levels) in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:811:in `block in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `with_connection'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:810:in `migrate'
/var/www/discourse/lib/migration/safe_migrate.rb:29:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1001:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1311:in `block in execute_migration_in_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1362:in `block in ddl_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:281:in `block in transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:281:in `transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/transactions.rb:212:in `transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1362:in `ddl_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1310:in `execute_migration_in_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1282:in `block in migrate_without_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1281:in `each'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1281:in `migrate_without_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1229:in `block in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1382:in `with_advisory_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1229:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1061:in `up'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1036:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/tasks/database_tasks.rb:238:in `migrate'
/var/www/discourse/lib/migration/safe_migrate.rb:52:in `migrate'
/var/www/discourse/lib/tasks/db.rake:72:in `block in <top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `<main>'

Caused by:
PG::UniqueViolation: ERROR:  duplicate key value violates unique constraint "index_poll_options_on_poll_id_and_digest"
DETAIL:  Key (poll_id, digest)=(30, 399fc6670871474cd7ce0458401fd299) already exists.
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.6/lib/patches/db/pg.rb:110:in `exec'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rack-mini-profiler-1.1.6/lib/patches/db/pg.rb:110:in `async_exec'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mini_sql-0.2.4/lib/mini_sql/postgres/connection.rb:118:in `run'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/mini_sql-0.2.4/lib/mini_sql/postgres/connection.rb:55:in `query_single'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:131:in `block (2 levels) in up'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:87:in `each'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:87:in `block in up'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:64:in `each'
/var/www/discourse/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb:64:in `up'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:831:in `exec_migration'
/var/www/discourse/lib/freedom_patches/schema_migration_details.rb:9:in `block in exec_migration'
/var/www/discourse/lib/freedom_patches/schema_migration_details.rb:8:in `exec_migration'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:812:in `block (2 levels) in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:811:in `block in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `with_connection'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:810:in `migrate'
/var/www/discourse/lib/migration/safe_migrate.rb:29:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1001:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1311:in `block in execute_migration_in_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1362:in `block in ddl_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:281:in `block in transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/connection_adapters/abstract/database_statements.rb:281:in `transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/transactions.rb:212:in `transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1362:in `ddl_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1310:in `execute_migration_in_transaction'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1282:in `block in migrate_without_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1281:in `each'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1281:in `migrate_without_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1229:in `block in migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1382:in `with_advisory_lock'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1229:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1061:in `up'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/migration.rb:1036:in `migrate'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.1/lib/active_record/tasks/database_tasks.rb:238:in `migrate'
/var/www/discourse/lib/migration/safe_migrate.rb:52:in `migrate'
/var/www/discourse/lib/tasks/db.rake:72:in `block in <top (required)>'
/var/www/discourse/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
/usr/local/bin/bundle:23:in `load'
/usr/local/bin/bundle:23:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
I, [2020-02-27T10:38:06.821527 #1]  INFO -- : == 20180820080623 MigratePollsData: migrating =================================
...
I, [2020-02-27T10:38:06.822339 #1]  INFO -- : Terminating async processes
I, [2020-02-27T10:38:06.822638 #1]  INFO -- : Sending INT to HOME=/var/lib/postgresql USER=postgres exec chpst -u postgres:postgres:ssl-cert -U postgres:postgres:ssl-cert /usr/lib/postgresql/10/bin/postmaster -D /etc/postgresql/10/main pid: 50
I, [2020-02-27T10:38:06.822850 #1]  INFO -- : Sending TERM to exec chpst -u redis -U redis /usr/bin/redis-server /etc/redis/redis.conf pid: 167
2020-02-27 10:38:06.822 UTC [50] LOG:  received fast shutdown request
167:signal-handler (1582799886) Received SIGTERM scheduling shutdown...
2020-02-27 10:38:06.825 UTC [50] LOG:  aborting any active transactions
167:M 27 Feb 2020 10:38:06.828 # User requested shutdown...
2020-02-27 10:38:06.828 UTC [50] LOG:  worker process: logical replication launcher (PID 59) exited with exit code 1
167:M 27 Feb 2020 10:38:06.829 * Saving the final RDB snapshot before exiting.
2020-02-27 10:38:06.839 UTC [54] LOG:  shutting down
2020-02-27 10:38:06.941 UTC [50] LOG:  database system is shut down
167:M 27 Feb 2020 10:38:07.170 * DB saved on disk
167:M 27 Feb 2020 10:38:07.171 # Redis is now ready to exit, bye bye...


FAILED
--------------------
Pups::ExecError: cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate' failed with return #<Process::Status: pid 385 exit 1>
Location of failure: /pups/lib/pups/exec_command.rb:112:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"db_migrate", "cmd"=>["su discourse -c 'bundle exec rake db:migrate'"]}
77bc12013304841e8082e888a7a8c86adade040fd97b44fef1c1e85355ba2ae5
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.

Note: I am intentionally used ./launcher rebuild synfig-forums command, because my instance is described in synfig-forums.yml file, not app.yml.

As I understand, the problem described by this line:

ERROR:  duplicate key value violates unique constraint "index_poll_options_on_poll_id_and_digest"
DETAIL:  Key (poll_id, digest)=(30, 399fc6670871474cd7ce0458401fd299) already exists.

What can I do in this situation? Any assistance is much appreciated!

morevnaproject · 2020 年2 月 27 日 13:32

好的，我想检查数据库内容，于是执行了以下操作：

cd /var/discourse
./launcher start synfig-forums
./launcher enter synfig-forums
su - postgres
psql

结果出现错误：

psql: 无法连接到服务器：没有那个文件或目录
	服务器是否在本地运行，并正在
	接受 Unix 域套接字 "/var/run/postgresql/.s.PGSQL.5432" 上的连接？

pfaffman · 2020 年2 月 27 日 13:38

您的索引已损坏。请参阅 Can't restore due to corrupt indexes (with some clues on how to deal with corrupt indexes) 获取一些提示。

您是否有独立的数据库容器？我猜您有，并且需要进入该容器进行操作。

morevnaproject · 2020 年2 月 27 日 13:39

感谢提供这些提示！

不，我使用的是独立容器安装（我想这是它的叫法）。

我尝试启动 PostgreSQL 服务（来自 Docker 容器），结果如下：

root@cloud-synfig-forums:/var/www/discourse# service postgresql start
 * Starting PostgreSQL 10 database server                                        * Error: Config owner (postgres:107) and data owner (syslog:106) do not match, and config owner is not root
                                                                         [fail]

morevnaproject · 2020 年2 月 27 日 13:47

好的，我已经成功启动了 PostgreSQL 服务，完成了数据库备份，并进入了数据库：

# chown -R postgres /shared/postgres_data
# service postgresql start
 * Starting PostgreSQL 10 database server                                                                                        [ OK ] 
# psql
psql: FATAL:  role "root" does not exist
# su - discourse
$ pg_dump -xOf ~/discourse-backup.sql -d discourse -n public
$ exit
# mv /home/discourse/discourse-backup.sql /shared/discourse-backup-20200227-1.sql
# su - postgres
$ psql discourse
psql (10.4 (Ubuntu 10.4-2.pgdg16.04+1))
Type "help" for help.

discourse=#

现在，我该怎么做才能恢复我的安装？

pfaffman · 2020 年2 月 27 日 13:48

听起来不太妙。

你在重建时有没有看到关于升级 PostgreSQL 的提示？你运行了不止一次吗？

你有最近的备份吗？也许从备份恢复是最简单的办法，但这也会很困难。

morevnaproject · 2020 年2 月 27 日 13:57

我不太记得了。当时通过 Web UI 升级时，消息太多了。

是的，我运行了多次更新：第一次通过 Web UI（失败了），然后从控制台运行了多次。

是的，我有 24 小时前做的备份。我可以恢复它，但会丢失一些消息（即备份之后发布的消息）。

Falco · 2020 年2 月 27 日 14:43

这不是一个损坏的索引。

在 2.1 到 2.5 版本之间，我们将池从 PluginStore 迁移到了正规的表中。迁移的原因之一是为了确保数据一致性，而这正是您遇到的问题。

您的 poll_options 表中存在重复值。您能否前往该表并删除重复的条目？

morevnaproject · 2020 年2 月 27 日 14:46

感谢您的澄清！
我不是 PostgreSQL 专家……能否请您帮忙提供需要执行的命令？（假设我已经进入了 psql 环境。）

morevnaproject · 2020 年2 月 27 日 16:03

好的，我已经执行了以下命令：

discourse=# SELECT * FROM poll_options;
 id | poll_id | digest | html | anonymous_votes | created_at | updated_at 
----+---------+--------+------+-----------------+------------+------------
(0 rows)

为什么这个表是空的？

其他表并不是空的：

discourse=# SELECT name FROM badges WHERE id = 13;
    name    
------------
 First Flag
(1 row)

morevnaproject · 2020 年2 月 27 日 16:09

我怀疑重复的条目来自插件商店。但它位于何处，我又该如何查看或编辑它？

RGJ · 2020 年2 月 27 日 16:47

这只是另一个表（plugin_store_rows）。

Falco · 2020 年2 月 27 日 16:59

看来投票数据实际上存储在 post_custom_fields 表中，其中 name 列的值为 ‘polls’。

RGJ · 2020 年2 月 27 日 17:46

这一变更由此提交引入，相应的迁移脚本会填充 poll_options 表。因此，这可能是尝试插入重复记录。

https://github.com/discourse/discourse/blob/master/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb#L132-L138

morevnaproject · 2020 年2 月 28 日 06:29

因此，我看到自己有两个选择：

从数据库中删除所有投票数据，然后重新运行更新过程。这样我会丢失所有投票，但我可以接受。
修改 migrate_polls_data.rb 的代码，使其跳过插入重复条目。这是更好的解决方案，但我不知道如何操作。

morevnaproject · 2020 年2 月 28 日 06:49

我该如何修改代码，使这部分在失败时静默处理？

morevnaproject · 2020 年2 月 28 日 06:57

https://github.com/discourse/discourse/blob/master/plugins/poll/db/post_migrate/20180820080623_migrate_polls_data.rb#L132-L138

好的，我认为只需在 SQL 语句中添加 ON CONFLICT DO NOTHING 即可修改——https://stackoverflow.com/a/31742830
这样行得通吗？

morevnaproject · 2020 年2 月 29 日 07:19

好的，我从 pgsql 执行了以下操作：

SELECT *
	FROM post_custom_fields
	WHERE name = 'polls'
	AND value LIKE '%399fc6670871474cd7ce0458401fd299%';

结果显示了一行。因此，我删除了该行：

DELETE FROM post_custom_fields
	WHERE name = 'polls'
	AND value LIKE '%399fc6670871474cd7ce0458401fd299%';

注意：正确的方式应该是按行 ID 删除，但由于只返回了一行，我就直接这样做了。

之后，我重新启动了升级，并成功完成。感谢所有提供提示的人！

system · 2020 年3 月 30 日 07:19

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2.7.0.beta2 upgrade failed with ERROR: duplicate key Self-hosting	25	2286	2021 年2 月 25 日
Update failed - PG::UniqueViolation: ERROR Self-hosting	8	842	2021 年11 月 14 日
Upgrade Issues: Failed Upgrade due to Duplicate Key, Failed Snapshot Restore Self-hosting	7	1689	2023 年4 月 25 日
Importing old database to latest version Self-hosting	17	1309	2022 年7 月 7 日
Failed upgrade: UniqueViolation: duplicate key value violates unique constraint "data_explorer_queries_pkey" Self-hosting	12	2071	2020 年10 月 10 日

升级失败，出现“重复键值违反唯一约束”错误

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