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This makes it possible to turn checksums on in a live cluster, without the previous need for dump/reload or logical replication (and to turn it off). Enabling checkusm starts a background process in the form of a launcher/worker combination that goes through the entire database and recalculates checksums on each and every page. Only when all pages have been checksummed are they fully enabled in the cluster. Any failure of the process will revert to checksums off and the process has to be started. This adds a new WAL record that indicates the state of checksums, so the process works across replicated clusters. Authors: Magnus Hagander and Daniel Gustafsson Review: Tomas Vondra, Michael Banck, Heikki Linnakangas, Andrey Borodin |
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