granicus.if.org Git - postgresql/blob - contrib/pg_upgrade/pg_upgrade.c

   1 /*
   2  *      pg_upgrade.c
   3  *
   4  *      main source file
   5  *
   6  *      Copyright (c) 2010-2012, PostgreSQL Global Development Group
   7  *      contrib/pg_upgrade/pg_upgrade.c
   8  */
   9
  10 /*
  11  *      To simplify the upgrade process, we force certain system values to be
  12  *      identical between old and new clusters:
  13  *
  14  *      We control all assignments of pg_class.oid (and relfilenode) so toast
  15  *      oids are the same between old and new clusters.  This is important
  16  *      because toast oids are stored as toast pointers in user tables.
  17  *
  18  *      FYI, while pg_class.oid and pg_class.relfilenode are initially the same
  19  *      in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
  20  *      FULL.  The new cluster will have matching pg_class.oid and
  21  *      pg_class.relfilenode values and be based on the old oid value.  This can
  22  *      cause the old and new pg_class.relfilenode values to differ.  In summary,
  23  *      old and new pg_class.oid and new pg_class.relfilenode will have the
  24  *      same value, and old pg_class.relfilenode might differ.
  25  *
  26  *      We control all assignments of pg_type.oid because these oids are stored
  27  *      in user composite type values.
  28  *
  29  *      We control all assignments of pg_enum.oid because these oids are stored
  30  *      in user tables as enum values.
  31  *
  32  *      We control all assignments of pg_authid.oid because these oids are stored
  33  *      in pg_largeobject_metadata.
  34  */
  35
  36
  37
  38 #include "postgres.h"
  39
  40 #include "pg_upgrade.h"
  41
  42 #ifdef HAVE_LANGINFO_H
  43 #include <langinfo.h>
  44 #endif
  45
  46 static void prepare_new_cluster(void);
  47 static void prepare_new_databases(void);
  48 static void create_new_objects(void);
  49 static void copy_clog_xlog_xid(void);
  50 static void set_frozenxids(void);
  51 static void setup(char *argv0, bool live_check);
  52 static void cleanup(void);
  53
  54 ClusterInfo old_cluster,
  55                         new_cluster;
  56 OSInfo          os_info;
  57
  58 char       *output_files[] = {
  59         SERVER_LOG_FILE,
  60 #ifdef WIN32
  61         /* unique file for pg_ctl start */
  62         SERVER_START_LOG_FILE,
  63 #endif
  64         RESTORE_LOG_FILE,
  65         UTILITY_LOG_FILE,
  66         INTERNAL_LOG_FILE,
  67         NULL
  68 };
  69
  70
  71 int
  72 main(int argc, char **argv)
  73 {
  74         char       *sequence_script_file_name = NULL;
  75         char       *analyze_script_file_name = NULL;
  76         char       *deletion_script_file_name = NULL;
  77         bool            live_check = false;
  78
  79         parseCommandLine(argc, argv);
  80
  81         adjust_data_dir(&old_cluster);
  82         adjust_data_dir(&new_cluster);
  83
  84         output_check_banner(&live_check);
  85
  86         setup(argv[0], live_check);
  87
  88         check_cluster_versions();
  89
  90         get_sock_dir(&old_cluster, live_check);
  91         get_sock_dir(&new_cluster, false);
  92
  93         check_cluster_compatibility(live_check);
  94
  95         check_old_cluster(live_check, &sequence_script_file_name);
  96
  97
  98         /* -- NEW -- */
  99         start_postmaster(&new_cluster);
 100
 101         check_new_cluster();
 102         report_clusters_compatible();
 103
 104         pg_log(PG_REPORT, "\nPerforming Upgrade\n");
 105         pg_log(PG_REPORT, "------------------\n");
 106
 107         prepare_new_cluster();
 108
 109         stop_postmaster(false);
 110
 111         /*
 112          * Destructive Changes to New Cluster
 113          */
 114
 115         copy_clog_xlog_xid();
 116
 117         /* New now using xids of the old system */
 118
 119         /* -- NEW -- */
 120         start_postmaster(&new_cluster);
 121
 122         prepare_new_databases();
 123
 124         create_new_objects();
 125
 126         stop_postmaster(false);
 127
 128         /*
 129          * Most failures happen in create_new_objects(), which has completed at
 130          * this point.  We do this here because it is just before linking, which
 131          * will link the old and new cluster data files, preventing the old
 132          * cluster from being safely started once the new cluster is started.
 133          */
 134         if (user_opts.transfer_mode == TRANSFER_MODE_LINK)
 135                 disable_old_cluster();
 136
 137         transfer_all_new_dbs(&old_cluster.dbarr, &new_cluster.dbarr,
 138                                                  old_cluster.pgdata, new_cluster.pgdata);
 139
 140         /*
 141          * Assuming OIDs are only used in system tables, there is no need to
 142          * restore the OID counter because we have not transferred any OIDs from
 143          * the old system, but we do it anyway just in case.  We do it late here
 144          * because there is no need to have the schema load use new oids.
 145          */
 146         prep_status("Setting next OID for new cluster");
 147         exec_prog(UTILITY_LOG_FILE, NULL, true,
 148                           "\"%s/pg_resetxlog\" -o %u \"%s\"",
 149                           new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid,
 150                           new_cluster.pgdata);
 151         check_ok();
 152
 153         create_script_for_cluster_analyze(&analyze_script_file_name);
 154         create_script_for_old_cluster_deletion(&deletion_script_file_name);
 155
 156         issue_warnings(sequence_script_file_name);
 157
 158         pg_log(PG_REPORT, "\nUpgrade Complete\n");
 159         pg_log(PG_REPORT, "----------------\n");
 160
 161         output_completion_banner(analyze_script_file_name,
 162                                                          deletion_script_file_name);
 163
 164         pg_free(analyze_script_file_name);
 165         pg_free(deletion_script_file_name);
 166         pg_free(sequence_script_file_name);
 167
 168         cleanup();
 169
 170         return 0;
 171 }
 172
 173
 174 static void
 175 setup(char *argv0, bool live_check)
 176 {
 177         char            exec_path[MAXPGPATH];   /* full path to my executable */
 178
 179         /*
 180          * make sure the user has a clean environment, otherwise, we may confuse
 181          * libpq when we connect to one (or both) of the servers.
 182          */
 183         check_pghost_envvar();
 184
 185         verify_directories();
 186
 187         /* no postmasters should be running */
 188         if (!live_check && is_server_running(old_cluster.pgdata))
 189                 pg_log(PG_FATAL, "There seems to be a postmaster servicing the old cluster.\n"
 190                            "Please shutdown that postmaster and try again.\n");
 191
 192         /* same goes for the new postmaster */
 193         if (is_server_running(new_cluster.pgdata))
 194                 pg_log(PG_FATAL, "There seems to be a postmaster servicing the new cluster.\n"
 195                            "Please shutdown that postmaster and try again.\n");
 196
 197         /* get path to pg_upgrade executable */
 198         if (find_my_exec(argv0, exec_path) < 0)
 199                 pg_log(PG_FATAL, "Could not get path name to pg_upgrade: %s\n", getErrorText(errno));
 200
 201         /* Trim off program name and keep just path */
 202         *last_dir_separator(exec_path) = '\0';
 203         canonicalize_path(exec_path);
 204         os_info.exec_path = pg_strdup(exec_path);
 205 }
 206
 207
 208 static void
 209 prepare_new_cluster(void)
 210 {
 211         /*
 212          * It would make more sense to freeze after loading the schema, but that
 213          * would cause us to lose the frozenids restored by the load. We use
 214          * --analyze so autovacuum doesn't update statistics later
 215          */
 216         prep_status("Analyzing all rows in the new cluster");
 217         exec_prog(UTILITY_LOG_FILE, NULL, true,
 218                           "\"%s/vacuumdb\" %s --all --analyze %s",
 219                           new_cluster.bindir, cluster_conn_opts(&new_cluster),
 220                           log_opts.verbose ? "--verbose" : "");
 221         check_ok();
 222
 223         /*
 224          * We do freeze after analyze so pg_statistic is also frozen. template0 is
 225          * not frozen here, but data rows were frozen by initdb, and we set its
 226          * datfrozenxid and relfrozenxids later to match the new xid counter
 227          * later.
 228          */
 229         prep_status("Freezing all rows on the new cluster");
 230         exec_prog(UTILITY_LOG_FILE, NULL, true,
 231                           "\"%s/vacuumdb\" %s --all --freeze %s",
 232                           new_cluster.bindir, cluster_conn_opts(&new_cluster),
 233                           log_opts.verbose ? "--verbose" : "");
 234         check_ok();
 235
 236         get_pg_database_relfilenode(&new_cluster);
 237 }
 238
 239
 240 static void
 241 prepare_new_databases(void)
 242 {
 243         /*
 244          * We set autovacuum_freeze_max_age to its maximum value so autovacuum
 245          * does not launch here and delete clog files, before the frozen xids are
 246          * set.
 247          */
 248
 249         set_frozenxids();
 250
 251         prep_status("Creating databases in the new cluster");
 252
 253         /*
 254          * Install support functions in the global-object restore database to
 255          * preserve pg_authid.oid.      pg_dumpall uses 'template0' as its template
 256          * database so objects we add into 'template1' are not propogated.      They
 257          * are removed on pg_upgrade exit.
 258          */
 259         install_support_functions_in_new_db("template1");
 260
 261         /*
 262          * We have to create the databases first so we can install support
 263          * functions in all the other databases.  Ideally we could create the
 264          * support functions in template1 but pg_dumpall creates database using
 265          * the template0 template.
 266          */
 267         exec_prog(RESTORE_LOG_FILE, NULL, true,
 268                           "\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s\"",
 269                           new_cluster.bindir, cluster_conn_opts(&new_cluster),
 270                           GLOBALS_DUMP_FILE);
 271         check_ok();
 272
 273         /* we load this to get a current list of databases */
 274         get_db_and_rel_infos(&new_cluster);
 275 }
 276
 277
 278 static void
 279 create_new_objects(void)
 280 {
 281         int                     dbnum;
 282
 283         prep_status("Adding support functions to new cluster");
 284
 285         for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
 286         {
 287                 DbInfo     *new_db = &new_cluster.dbarr.dbs[dbnum];
 288
 289                 /* skip db we already installed */
 290                 if (strcmp(new_db->db_name, "template1") != 0)
 291                         install_support_functions_in_new_db(new_db->db_name);
 292         }
 293         check_ok();
 294
 295         prep_status("Restoring database schema to new cluster");
 296         exec_prog(RESTORE_LOG_FILE, NULL, true,
 297                           "\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s\"",
 298                           new_cluster.bindir, cluster_conn_opts(&new_cluster),
 299                           DB_DUMP_FILE);
 300         check_ok();
 301
 302         /* regenerate now that we have objects in the databases */
 303         get_db_and_rel_infos(&new_cluster);
 304
 305         uninstall_support_functions_from_new_cluster();
 306 }
 307
 308 /*
 309  * Delete the given subdirectory contents from the new cluster, and copy the
 310  * files from the old cluster into it.
 311  */
 312 static void
 313 copy_subdir_files(char *subdir)
 314 {
 315         char            old_path[MAXPGPATH];
 316         char            new_path[MAXPGPATH];
 317
 318         prep_status("Deleting files from new %s", subdir);
 319
 320         snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, subdir);
 321         snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
 322         if (!rmtree(new_path, true))
 323                 pg_log(PG_FATAL, "could not delete directory \"%s\"\n", new_path);
 324         check_ok();
 325
 326         prep_status("Copying old %s to new server", subdir);
 327
 328         exec_prog(UTILITY_LOG_FILE, NULL, true,
 329 #ifndef WIN32
 330                           "cp -Rf \"%s\" \"%s\"",
 331 #else
 332         /* flags: everything, no confirm, quiet, overwrite read-only */
 333                           "xcopy /e /y /q /r \"%s\" \"%s\\\"",
 334 #endif
 335                           old_path, new_path);
 336
 337         check_ok();
 338 }
 339
 340 static void
 341 copy_clog_xlog_xid(void)
 342 {
 343         /* copy old commit logs to new data dir */
 344         copy_subdir_files("pg_clog");
 345
 346         /* set the next transaction id of the new cluster */
 347         prep_status("Setting next transaction ID for new cluster");
 348         exec_prog(UTILITY_LOG_FILE, NULL, true,
 349                           "\"%s/pg_resetxlog\" -f -x %u \"%s\"",
 350                           new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
 351                           new_cluster.pgdata);
 352         check_ok();
 353
 354         /* now reset the wal archives in the new cluster */
 355         prep_status("Resetting WAL archives");
 356         exec_prog(UTILITY_LOG_FILE, NULL, true,
 357                           "\"%s/pg_resetxlog\" -l %s \"%s\"", new_cluster.bindir,
 358                           old_cluster.controldata.nextxlogfile,
 359                           new_cluster.pgdata);
 360         check_ok();
 361 }
 362
 363
 364 /*
 365  *      set_frozenxids()
 366  *
 367  *      We have frozen all xids, so set relfrozenxid and datfrozenxid
 368  *      to be the old cluster's xid counter, which we just set in the new
 369  *      cluster.  User-table frozenxid values will be set by pg_dumpall
 370  *      --binary-upgrade, but objects not set by the pg_dump must have
 371  *      proper frozen counters.
 372  */
 373 static
 374 void
 375 set_frozenxids(void)
 376 {
 377         int                     dbnum;
 378         PGconn     *conn,
 379                            *conn_template1;
 380         PGresult   *dbres;
 381         int                     ntups;
 382         int                     i_datname;
 383         int                     i_datallowconn;
 384
 385         prep_status("Setting frozenxid counters in new cluster");
 386
 387         conn_template1 = connectToServer(&new_cluster, "template1");
 388
 389         /* set pg_database.datfrozenxid */
 390         PQclear(executeQueryOrDie(conn_template1,
 391                                                           "UPDATE pg_catalog.pg_database "
 392                                                           "SET  datfrozenxid = '%u'",
 393                                                           old_cluster.controldata.chkpnt_nxtxid));
 394
 395         /* get database names */
 396         dbres = executeQueryOrDie(conn_template1,
 397                                                           "SELECT       datname, datallowconn "
 398                                                           "FROM pg_catalog.pg_database");
 399
 400         i_datname = PQfnumber(dbres, "datname");
 401         i_datallowconn = PQfnumber(dbres, "datallowconn");
 402
 403         ntups = PQntuples(dbres);
 404         for (dbnum = 0; dbnum < ntups; dbnum++)
 405         {
 406                 char       *datname = PQgetvalue(dbres, dbnum, i_datname);
 407                 char       *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
 408
 409                 /*
 410                  * We must update databases where datallowconn = false, e.g.
 411                  * template0, because autovacuum increments their datfrozenxids and
 412                  * relfrozenxids even if autovacuum is turned off, and even though all
 413                  * the data rows are already frozen  To enable this, we temporarily
 414                  * change datallowconn.
 415                  */
 416                 if (strcmp(datallowconn, "f") == 0)
 417                         PQclear(executeQueryOrDie(conn_template1,
 418                                                                           "UPDATE pg_catalog.pg_database "
 419                                                                           "SET  datallowconn = true "
 420                                                                           "WHERE datname = '%s'", datname));
 421
 422                 conn = connectToServer(&new_cluster, datname);
 423
 424                 /* set pg_class.relfrozenxid */
 425                 PQclear(executeQueryOrDie(conn,
 426                                                                   "UPDATE       pg_catalog.pg_class "
 427                                                                   "SET  relfrozenxid = '%u' "
 428                 /* only heap and TOAST are vacuumed */
 429                                                                   "WHERE        relkind IN ('r', 't')",
 430                                                                   old_cluster.controldata.chkpnt_nxtxid));
 431                 PQfinish(conn);
 432
 433                 /* Reset datallowconn flag */
 434                 if (strcmp(datallowconn, "f") == 0)
 435                         PQclear(executeQueryOrDie(conn_template1,
 436                                                                           "UPDATE pg_catalog.pg_database "
 437                                                                           "SET  datallowconn = false "
 438                                                                           "WHERE datname = '%s'", datname));
 439         }
 440
 441         PQclear(dbres);
 442
 443         PQfinish(conn_template1);
 444
 445         check_ok();
 446 }
 447
 448
 449 static void
 450 cleanup(void)
 451 {
 452
 453         fclose(log_opts.internal);
 454
 455         /* Remove dump and log files? */
 456         if (!log_opts.retain)
 457         {
 458                 char      **filename;
 459
 460                 for (filename = output_files; *filename != NULL; filename++)
 461                         unlink(*filename);
 462
 463                 /* remove SQL files */
 464                 unlink(ALL_DUMP_FILE);
 465                 unlink(GLOBALS_DUMP_FILE);
 466                 unlink(DB_DUMP_FILE);
 467         }
 468 }