rdelaage
/
postgresql
mirror of https://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
postgresql/contrib/pg_upgrade/pg_upgrade.c

439 lines
12 KiB
C
Raw Blame History

/*
* pg_upgrade.c
*
* main source file
*
* Copyright (c) 2010-2012, PostgreSQL Global Development Group
* contrib/pg_upgrade/pg_upgrade.c
*/
/*
* To simplify the upgrade process, we force certain system values to be
* identical between old and new clusters:
*
* We control all assignments of pg_class.oid (and relfilenode) so toast
* oids are the same between old and new clusters. This is important
* because toast oids are stored as toast pointers in user tables.
*
* FYI, while pg_class.oid and pg_class.relfilenode are intially the same
* in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
* FULL. The new cluster will have matching pg_class.oid and
* pg_class.relfilenode values and be based on the old oid value. This can
* cause the old and new pg_class.relfilenode values to differ. In summary,
* old and new pg_class.oid and new pg_class.relfilenode will have the
* same value, and old pg_class.relfilenode might differ.
*
* We control all assignments of pg_type.oid because these oids are stored
* in user composite type values.
*
* We control all assignments of pg_enum.oid because these oids are stored
* in user tables as enum values.
*
* We control all assignments of pg_auth.oid because these oids are stored
* in pg_largeobject_metadata.
*/
#include "postgres.h"
#include "pg_upgrade.h"
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif
static void disable_old_cluster(void);
static void prepare_new_cluster(void);
static void prepare_new_databases(void);
static void create_new_objects(void);
static void copy_clog_xlog_xid(void);
static void set_frozenxids(void);
static void setup(char *argv0, bool live_check);
static void cleanup(void);
ClusterInfo old_cluster,
new_cluster;
OSInfo os_info;
int
main(int argc, char **argv)
{
char *sequence_script_file_name = NULL;
char *deletion_script_file_name = NULL;
bool live_check = false;
parseCommandLine(argc, argv);
adjust_data_dir(&old_cluster);
adjust_data_dir(&new_cluster);
output_check_banner(&live_check);
setup(argv[0], live_check);
check_cluster_versions();
check_cluster_compatibility(live_check);
check_old_cluster(live_check, &sequence_script_file_name);
/* -- NEW -- */
start_postmaster(&new_cluster);
check_new_cluster();
report_clusters_compatible();
pg_log(PG_REPORT, "\nPerforming Upgrade\n");
pg_log(PG_REPORT, "------------------\n");
disable_old_cluster();
prepare_new_cluster();
stop_postmaster(false);
/*
* Destructive Changes to New Cluster
*/
copy_clog_xlog_xid();
/* New now using xids of the old system */
/* -- NEW -- */
start_postmaster(&new_cluster);
prepare_new_databases();
create_new_objects();
stop_postmaster(false);
transfer_all_new_dbs(&old_cluster.dbarr, &new_cluster.dbarr,
old_cluster.pgdata, new_cluster.pgdata);
/*
* Assuming OIDs are only used in system tables, there is no need to
* restore the OID counter because we have not transferred any OIDs from
* the old system, but we do it anyway just in case. We do it late here
* because there is no need to have the schema load use new oids.
*/
prep_status("Setting next OID for new cluster");
exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -o %u \"%s\" > "
DEVNULL SYSTEMQUOTE,
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid, new_cluster.pgdata);
check_ok();
create_script_for_old_cluster_deletion(&deletion_script_file_name);
issue_warnings(sequence_script_file_name);
pg_log(PG_REPORT, "\nUpgrade complete\n");
pg_log(PG_REPORT, "----------------\n");
output_completion_banner(deletion_script_file_name);
pg_free(deletion_script_file_name);
pg_free(sequence_script_file_name);
cleanup();
return 0;
}
static void
setup(char *argv0, bool live_check)
{
char exec_path[MAXPGPATH]; /* full path to my executable */
/*
* make sure the user has a clean environment, otherwise, we may confuse
* libpq when we connect to one (or both) of the servers.
*/
check_pghost_envvar();
verify_directories();
/* no postmasters should be running */
if (!live_check && is_server_running(old_cluster.pgdata))
pg_log(PG_FATAL, "There seems to be a postmaster servicing the old cluster.\n"
"Please shutdown that postmaster and try again.\n");
/* same goes for the new postmaster */
if (is_server_running(new_cluster.pgdata))
pg_log(PG_FATAL, "There seems to be a postmaster servicing the new cluster.\n"
"Please shutdown that postmaster and try again.\n");
/* get path to pg_upgrade executable */
if (find_my_exec(argv0, exec_path) < 0)
pg_log(PG_FATAL, "Could not get path name to pg_upgrade: %s\n", getErrorText(errno));
/* Trim off program name and keep just path */
*last_dir_separator(exec_path) = '\0';
canonicalize_path(exec_path);
os_info.exec_path = pg_strdup(exec_path);
}
static void
disable_old_cluster(void)
{
/* rename pg_control so old server cannot be accidentally started */
rename_old_pg_control();
}
static void
prepare_new_cluster(void)
{
/*
* It would make more sense to freeze after loading the schema, but that
* would cause us to lose the frozenids restored by the load. We use
* --analyze so autovacuum doesn't update statistics later
*/
prep_status("Analyzing all rows in the new cluster");
exec_prog(true,
SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
"--all --analyze >> \"%s\" 2>&1" SYSTEMQUOTE,
new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename2);
check_ok();
/*
* We do freeze after analyze so pg_statistic is also frozen. template0 is
* not frozen here, but data rows were frozen by initdb, and we set its
* datfrozenxid and relfrozenxids later to match the new xid counter
* later.
*/
prep_status("Freezing all rows on the new cluster");
exec_prog(true,
SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
"--all --freeze >> \"%s\" 2>&1" SYSTEMQUOTE,
new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename2);
check_ok();
get_pg_database_relfilenode(&new_cluster);
}
static void
prepare_new_databases(void)
{
/*
* We set autovacuum_freeze_max_age to its maximum value so autovacuum
* does not launch here and delete clog files, before the frozen xids are
* set.
*/
set_frozenxids();
prep_status("Creating databases in the new cluster");
/*
* Install support functions in the global-object restore database to
* preserve pg_authid.oid. pg_dumpall uses 'template0' as its template
* database so objects we add into 'template1' are not propogated. They
* are removed on pg_upgrade exit.
*/
install_support_functions_in_new_db("template1");
/*
* We have to create the databases first so we can install support
* functions in all the other databases. Ideally we could create the
* support functions in template1 but pg_dumpall creates database using
* the template0 template.
*/
exec_prog(true,
SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
/* --no-psqlrc prevents AUTOCOMMIT=off */
"--no-psqlrc --port %d --username \"%s\" "
"-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
GLOBALS_DUMP_FILE, log_opts.filename2);
check_ok();
/* we load this to get a current list of databases */
get_db_and_rel_infos(&new_cluster);
}
static void
create_new_objects(void)
{
int dbnum;
prep_status("Adding support functions to new cluster");
for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
{
DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
/* skip db we already installed */
if (strcmp(new_db->db_name, "template1") != 0)
install_support_functions_in_new_db(new_db->db_name);
}
check_ok();
prep_status("Restoring database schema to new cluster");
exec_prog(true,
SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
"--no-psqlrc --port %d --username \"%s\" "
"-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
DB_DUMP_FILE, log_opts.filename2);
check_ok();
/* regenerate now that we have objects in the databases */
get_db_and_rel_infos(&new_cluster);
uninstall_support_functions_from_new_cluster();
}
static void
copy_clog_xlog_xid(void)
{
char old_clog_path[MAXPGPATH];
char new_clog_path[MAXPGPATH];
/* copy old commit logs to new data dir */
prep_status("Deleting new commit clogs");
snprintf(old_clog_path, sizeof(old_clog_path), "%s/pg_clog", old_cluster.pgdata);
snprintf(new_clog_path, sizeof(new_clog_path), "%s/pg_clog", new_cluster.pgdata);
if (!rmtree(new_clog_path, true))
pg_log(PG_FATAL, "could not delete directory \"%s\"\n", new_clog_path);
check_ok();
prep_status("Copying old commit clogs to new server");
#ifndef WIN32
exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\"" SYSTEMQUOTE,
"cp -Rf",
#else
/* flags: everything, no confirm, quiet, overwrite read-only */
exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\\\"" SYSTEMQUOTE,
"xcopy /e /y /q /r",
#endif
old_clog_path, new_clog_path);
check_ok();
/* set the next transaction id of the new cluster */
prep_status("Setting next transaction ID for new cluster");
exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -f -x %u \"%s\" > " DEVNULL SYSTEMQUOTE,
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid, new_cluster.pgdata);
check_ok();
/* now reset the wal archives in the new cluster */
prep_status("Resetting WAL archives");
exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -l %u,%u,%u \"%s\" >> \"%s\" 2>&1" SYSTEMQUOTE,
new_cluster.bindir, old_cluster.controldata.chkpnt_tli,
old_cluster.controldata.logid, old_cluster.controldata.nxtlogseg,
new_cluster.pgdata, log_opts.filename2);
check_ok();
}
/*
* set_frozenxids()
*
* We have frozen all xids, so set relfrozenxid and datfrozenxid
* to be the old cluster's xid counter, which we just set in the new
* cluster. User-table frozenxid values will be set by pg_dumpall
* --binary-upgrade, but objects not set by the pg_dump must have
* proper frozen counters.
*/
static
void
set_frozenxids(void)
{
int dbnum;
PGconn *conn,
*conn_template1;
PGresult *dbres;
int ntups;
int i_datname;
int i_datallowconn;
prep_status("Setting frozenxid counters in new cluster");
conn_template1 = connectToServer(&new_cluster, "template1");
/* set pg_database.datfrozenxid */
PQclear(executeQueryOrDie(conn_template1,
"UPDATE pg_catalog.pg_database "
"SET datfrozenxid = '%u'",
old_cluster.controldata.chkpnt_nxtxid));
/* get database names */
dbres = executeQueryOrDie(conn_template1,
"SELECT datname, datallowconn "
"FROM pg_catalog.pg_database");
i_datname = PQfnumber(dbres, "datname");
i_datallowconn = PQfnumber(dbres, "datallowconn");
ntups = PQntuples(dbres);
for (dbnum = 0; dbnum < ntups; dbnum++)
{
char *datname = PQgetvalue(dbres, dbnum, i_datname);
char *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
/*
* We must update databases where datallowconn = false, e.g.
* template0, because autovacuum increments their datfrozenxids and
* relfrozenxids even if autovacuum is turned off, and even though all
* the data rows are already frozen To enable this, we temporarily
* change datallowconn.
*/
if (strcmp(datallowconn, "f") == 0)
PQclear(executeQueryOrDie(conn_template1,
"UPDATE pg_catalog.pg_database "
"SET datallowconn = true "
"WHERE datname = '%s'", datname));
conn = connectToServer(&new_cluster, datname);
/* set pg_class.relfrozenxid */
PQclear(executeQueryOrDie(conn,
"UPDATE pg_catalog.pg_class "
"SET relfrozenxid = '%u' "
/* only heap and TOAST are vacuumed */
"WHERE relkind IN ('r', 't')",
old_cluster.controldata.chkpnt_nxtxid));
PQfinish(conn);
/* Reset datallowconn flag */
if (strcmp(datallowconn, "f") == 0)
PQclear(executeQueryOrDie(conn_template1,
"UPDATE pg_catalog.pg_database "
"SET datallowconn = false "
"WHERE datname = '%s'", datname));
}
PQclear(dbres);
PQfinish(conn_template1);
check_ok();
}
static void
cleanup(void)
{
char filename[MAXPGPATH];
if (log_opts.fd)
fclose(log_opts.fd);
if (log_opts.debug_fd)
fclose(log_opts.debug_fd);
snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, ALL_DUMP_FILE);
unlink(filename);
snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, GLOBALS_DUMP_FILE);
unlink(filename);
snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, DB_DUMP_FILE);
unlink(filename);
}
Reference in New Issue View Git Blame Copy Permalink