Support for parallel migrations #6
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When provided, upgrade scripts are executed in parallel for databases, provided by backend.
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I'm not happy with the fact that this implementation opens all the connections before it starts processing migrations. Will deal with this tomorrow. |
Consume connection generator only when workers are available.
Database connections are typically not serializable and we cannot pass them to subprocesses. So, perform connection explicitly with new Backend.begin() method only inside worker process.
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Add command-line flag to specify concurrency level and test parallel migrations feature.