Sequel Migration Lock

A spike codebase to recreate the scenario where two processes (eg AWS instances) are trying to migrate the same database at the same time.

Installation

$ git clone git@github.com:bethesque/sequel-migration-lock.git
$ cd sequel-migration-lock
$ bundle

To create a race condition using the command line interface to MySQL
```
$ ./test_cmd_line.sh
```
This will fail with Table 'foo' already exists.
To create a race condition using Sequel migrate to simulate the scenario where no schema_info table exists:
```
$ ./test_ruby_with_no_schema_info.sh
```
This will fail with More than 1 row in migrator table (Sequel::Migrator::Error).
To create a race condition using Sequel migrate to simulate the scenario where the schema_info table already exists:
```
$ ./test_ruby_with_schema_info_already_created.sh.sh
```
This will fail with Mysql2::Error: Table 'foo' already exists (Sequel::DatabaseError).

A spike codebase to recreate the scenario where two processes (eg AWS instances) are trying to migrate the same database at the same time.

Language:Shell 63.3%Language:Ruby 31.3%Language:PLpgSQL 5.4%