org.openmetadata.service.migration.README.md Maven / Gradle / Ivy
# Migration Context
During the `MigrationWorkflow` execution we are executing validations on the data after each `MigrationProcess`. For
example, count the number of tables, users, or services.
1. At the `MigrationWorkflow::runMigrationWorkflows` we compute the `initial` context.
2. After each `MigrationProcess`, run the same queries and store the results.
3. In future iterations, we will compare the runs after each `MigrationProcess` to flag any unexpected diff.
## Common Operations
We have a set of queries that will always be executed. Those are defined in `CommonMigrationOps`.
## Migration Operations
Each `Migration` class can optionally override the `getMigrationOps` method, e.g.:
```java
@Override
public List getMigrationOps() {
return List.of(new MigrationOps("queryCount", "SELECT COUNT(*) FROM query_entity"));
}
```
Then, the `MigrationProcess` implemented for that `Migration` version will execute this query on top of the common ones.