database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-18 17:42:25 +03:00
Code Activity

Allow on-line enabling and disabling of data checksums

Browse Source 
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
This commit is contained in:
Magnus Hagander
2018-04-05 21:57:26 +02:00
parent c39e903d51
commit 1fde38beaa
45 changed files with 2118 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
src/backend/utils/misc/guc.c
View File

@ -32,6 +32,7 @@
#include "access/transam.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "catalog/namespace.h"
#include "catalog/pg_authid.h"
@ -68,6 +69,7 @@
#include "replication/walreceiver.h"
#include "replication/walsender.h"
#include "storage/bufmgr.h"
#include "storage/checksum.h"
#include "storage/dsm_impl.h"
#include "storage/standby.h"
#include "storage/fd.h"
@ -419,6 +421,17 @@ static const struct config_enum_entry password_encryption_options[] = {
{NULL, 0, false}
};
/*
* data_checksum used to be a boolean, but was only set by initdb so there is
* no need to support variants of boolean input.
*/
static const struct config_enum_entry data_checksum_options[] = {
{"on", DATA_CHECKSUMS_ON, true},
{"off", DATA_CHECKSUMS_OFF, true},
{"inprogress", DATA_CHECKSUMS_INPROGRESS, true},
{NULL, 0, false}
};
/*
* Options for enum values stored in other modules
*/
@ -514,7 +527,7 @@ static int max_identifier_length;
static int block_size;
static int segment_size;
static int wal_block_size;
static bool data_checksums;
static int data_checksums_tmp; /* only accessed locally! */
static bool integer_datetimes;
static bool assert_enabled;
@ -1683,17 +1696,6 @@ static struct config_bool ConfigureNamesBool[] =
NULL, NULL, NULL
},
{
{"data_checksums", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows whether data checksums are turned on for this cluster."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&data_checksums,
false,
NULL, NULL, NULL
},
{
{"syslog_sequence_numbers", PGC_SIGHUP, LOGGING_WHERE,
gettext_noop("Add sequence number to syslog messages to avoid duplicate suppression."),
@ -4111,6 +4113,17 @@ static struct config_enum ConfigureNamesEnum[] =
NULL, NULL, NULL
},
{
{"data_checksums", PGC_INTERNAL, PRESET_OPTIONS,
gettext_noop("Shows whether data checksums are turned on for this cluster."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&data_checksums_tmp,
DATA_CHECKSUMS_OFF, data_checksum_options,
NULL, NULL, show_data_checksums
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, 0, NULL, NULL, NULL, NULL