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re: How we use "ship small" to rapidly build new features at GitHub VIEW POST

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re: Really good post! Thank you for your effort. I have a question regarding feature flags in the backend. What if your new feature requires relatively...
 

That really depends on the migration + feature.

We can never take downtime at GitHub. So when making any DB change, it has to work with both the old and new code.

A recent example, we just had a feature that required us to move data to a new table. The process was like this.

  • Create the new table (no code changes)
  • Change writes to both the old and new table
  • Update the new feature to read from the new table (feature is behind a flag, so OK if data is incomplete)
  • Run backfill, transferring old data to the new table (slowly over a week)
  • Change old feature to read from the new table
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