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Enable pg_rewind to be used with PostgreSQL 9.3/9.4

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pg_rewind is not part of the core distribution for those, but we
provided support in repmgr 3.3 so should extend it to repmgr 4.

Note that there is no check in place whether the pg_rewind binary
exists, so it's up to the user to ensure it's present.

Addresses GitHub #413.
This commit is contained in:
Ian Barwick
2018-03-30 16:04:00 +09:00
committed by Ian Barwick
parent 5e4bdb5a1b
commit 3ccf1cf182
9 changed files with 180 additions and 94 deletions
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61
dbutils.c
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@@ -1339,67 +1339,6 @@ get_replication_info(PGconn *conn, ReplInfo *replication_info)
}
bool
can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *reason)
{
bool can_use = true;
if (server_version_num == UNKNOWN_SERVER_VERSION_NUM)
server_version_num = get_server_version(conn, NULL);
if (server_version_num < 90500)
{
appendPQExpBuffer(reason,
_("pg_rewind available from PostgreSQL 9.5"));
return false;
}
if (guc_set(conn, "full_page_writes", "=", "off"))
{
if (can_use == false)
appendPQExpBuffer(reason, "; ");
appendPQExpBuffer(reason,
_("\"full_page_writes\" must be set to \"on\""));
can_use = false;
}
/*
* "wal_log_hints" off - are data checksums available? Note: we're
* checking the local pg_control file here as the value will be the same
* throughout the cluster and saves a round-trip to the demotion
* candidate.
*/
if (guc_set(conn, "wal_log_hints", "=", "on") == false)
{
int data_checksum_version = get_data_checksum_version(data_directory);
if (data_checksum_version < 0)
{
if (can_use == false)
appendPQExpBuffer(reason, "; ");
appendPQExpBuffer(reason,
_("\"wal_log_hints\" is set to \"off\" but unable to determine data checksum version"));
can_use = false;
}
else if (data_checksum_version == 0)
{
if (can_use == false)
appendPQExpBuffer(reason, "; ");
appendPQExpBuffer(reason,
_("\"wal_log_hints\" is set to \"off\" and data checksums are disabled"));
can_use = false;
}
}
return can_use;
}
int
get_ready_archive_files(PGconn *conn, const char *data_directory)
{