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repmgr standby switchover: add sanity check for pg_rewind useability

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pg_rewind will only be executed on a demoted primary if explictly
requested, to prevent transactions on the primary, which
were never replicated, from being automatically overwritten.

If --force-rewind is provided, we'll need to check pg_rewind
is actually useable before we need to use it.
This commit is contained in:
Ian Barwick
2017-08-04 00:38:07 +09:00
parent 0815accdef
commit 5948cf6cda
8 changed files with 122 additions and 21 deletions
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34
controldata.c
View File

@@ -15,10 +15,10 @@
#include "repmgr.h"
#include "controldata.h"
static ControlFileInfo *get_controlfile(char *DataDir);
static ControlFileInfo *get_controlfile(const char *DataDir);
DBState
get_db_state(char *data_directory)
get_db_state(const char *data_directory)
{
ControlFileInfo *control_file_info;
DBState state;
@@ -37,8 +37,8 @@ get_db_state(char *data_directory)
}
XLogRecPtr
get_latest_checkpoint_location(char *data_directory)
extern XLogRecPtr
get_latest_checkpoint_location(const char *data_directory)
{
ControlFileInfo *control_file_info;
XLogRecPtr checkPoint;
@@ -57,6 +57,30 @@ get_latest_checkpoint_location(char *data_directory)
}
int
get_data_checksum_version(const char *data_directory)
{
ControlFileInfo *control_file_info;
int data_checksum_version;
control_file_info = get_controlfile(data_directory);
if (control_file_info->control_file_processed == false)
{
data_checksum_version = -1;
}
else
{
data_checksum_version = (int)control_file_info->control_file->data_checksum_version;
}
pfree(control_file_info->control_file);
pfree(control_file_info);
return data_checksum_version;
}
const char *
describe_db_state(DBState state)
{
@@ -86,7 +110,7 @@ describe_db_state(DBState state)
* compatibility, and also don't care if the file isn't readable.
*/
static ControlFileInfo *
get_controlfile(char *DataDir)
get_controlfile(const char *DataDir)
{
ControlFileInfo *control_file_info;
int fd;