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Introduce the concept of a "ZenithWalRecord", which can be a Postgres WAL record that is replayed with the Postgres WAL redo process, or a built-in type that is handled entirely by pageserver code. Replace the special code to replay Postgres XACT commit/abort records with new Zenith WAL records. A separate zenith WAL record is created for each modified CLOG page. This allows removing the 'main_data_offset' field from stored PostgreSQL WAL records, which saves some memory and some disk space in delta layers. Introduce zenith WAL records for updating bits in the visibility map. Previously, when e.g. a heap insert cleared the VM bit, we duplicated the heap insert WAL record for the affected VM page. That was very wasteful. The heap WAL record could be massive, containing a full page image in the worst case. This addresses github issue #941.
15 lines
459 B
C
15 lines
459 B
C
/*
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* This header file is the input to bindgen. It includes all the
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* PostgreSQL headers that we need to auto-generate Rust structs
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* from. If you need to expose a new struct to Rust code, add the
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* header here, and whitelist the struct in the build.rs file.
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*/
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#include "c.h"
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#include "catalog/pg_control.h"
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#include "access/xlog_internal.h"
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#include "storage/block.h"
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#include "storage/bufpage.h"
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#include "storage/off.h"
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#include "access/multixact.h"
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