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"standby follow": verify status of follow target

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This commit adds infrastruture for repmgr to be able to check
whether one standby can attach to another node, regardless whether
it is a standby or a primary.

This is intended to prevent a node from attempting to follow a
node whose timeline has diverged. The --dry-run option makes
it possible to test a follow operation before it is carried out.

As a useful side-effect this makes it possible for a standby to
follow another standby.

This is an initial implementation; documentation and possibly
further changes to follow.
This commit is contained in:
Ian Barwick
2018-11-29 17:14:38 +09:00
parent c53782cda3
commit 9e90fcd584
5 changed files with 355 additions and 97 deletions
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43
controldata.c
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@@ -114,7 +114,7 @@ get_db_state(const char *data_directory)
}
extern XLogRecPtr
XLogRecPtr
get_latest_checkpoint_location(const char *data_directory)
{
ControlFileInfo *control_file_info = NULL;
@@ -171,6 +171,38 @@ describe_db_state(DBState state)
}
TimeLineID
get_timeline(const char *data_directory)
{
ControlFileInfo *control_file_info = NULL;
TimeLineID timeline = -1;
control_file_info = get_controlfile(data_directory);
timeline = (int) control_file_info->timeline;
pfree(control_file_info);
return timeline;
}
XLogRecPtr
get_min_recovery_location(const char *data_directory)
{
ControlFileInfo *control_file_info = NULL;
XLogRecPtr minRecoveryPoint = InvalidXLogRecPtr;
control_file_info = get_controlfile(data_directory);
minRecoveryPoint = control_file_info->minRecoveryPoint;
pfree(control_file_info);
return minRecoveryPoint;
}
/*
* We maintain our own version of get_controlfile() as we need cross-version
* compatibility, and also don't care if the file isn't readable.
@@ -193,6 +225,7 @@ get_controlfile(const char *DataDir)
control_file_info->state = DB_SHUTDOWNED;
control_file_info->checkPoint = InvalidXLogRecPtr;
control_file_info->data_checksum_version = -1;
control_file_info->timeline = -1;
/*
* Read PG_VERSION, as we'll need to determine which struct to read
@@ -264,6 +297,8 @@ get_controlfile(const char *DataDir)
control_file_info->state = ptr->state;
control_file_info->checkPoint = ptr->checkPoint;
control_file_info->data_checksum_version = ptr->data_checksum_version;
control_file_info->timeline = ptr->checkPointCopy.ThisTimeLineID;
control_file_info->minRecoveryPoint = ptr->minRecoveryPoint;
}
else if (version_num >= 90500)
{
@@ -272,6 +307,8 @@ get_controlfile(const char *DataDir)
control_file_info->state = ptr->state;
control_file_info->checkPoint = ptr->checkPoint;
control_file_info->data_checksum_version = ptr->data_checksum_version;
control_file_info->timeline = ptr->checkPointCopy.ThisTimeLineID;
control_file_info->minRecoveryPoint = ptr->minRecoveryPoint;
}
else if (version_num >= 90400)
{
@@ -280,6 +317,8 @@ get_controlfile(const char *DataDir)
control_file_info->state = ptr->state;
control_file_info->checkPoint = ptr->checkPoint;
control_file_info->data_checksum_version = ptr->data_checksum_version;
control_file_info->timeline = ptr->checkPointCopy.ThisTimeLineID;
control_file_info->minRecoveryPoint = ptr->minRecoveryPoint;
}
else if (version_num >= 90300)
{
@@ -288,6 +327,8 @@ get_controlfile(const char *DataDir)
control_file_info->state = ptr->state;
control_file_info->checkPoint = ptr->checkPoint;
control_file_info->data_checksum_version = ptr->data_checksum_version;
control_file_info->timeline = ptr->checkPointCopy.ThisTimeLineID;
control_file_info->minRecoveryPoint = ptr->minRecoveryPoint;
}
pfree(ControlFileDataPtr);