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neon/docs
Arpad Müller 8ec6033ed8 Pageserver disaster recovery RFC (#5248)
Enable the pageserver to recover from data corruption events by
implementing a feature to re-apply historic WAL records in parallel to the already
occurring WAL replay.

The feature is outside of the user-visible backup and history story, and
only
serves as a second-level backup for the case that there is a bug in the
pageservers that corrupted the served pages.

The RFC proposes the addition of two new features:
* recover a broken branch from WAL (downtime is allowed)
* a test recovery system to recover random branches to make sure
recovery works
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