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If the postmaster.pid lock file exists, try starting/stopping the cluster to check if the lock file is valid. Per request from Tom.
582 lines
17 KiB
C
582 lines
17 KiB
C
/*
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* pg_upgrade.c
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*
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* main source file
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*
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* Copyright (c) 2010-2013, PostgreSQL Global Development Group
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* contrib/pg_upgrade/pg_upgrade.c
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*/
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/*
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* To simplify the upgrade process, we force certain system values to be
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* identical between old and new clusters:
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*
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* We control all assignments of pg_class.oid (and relfilenode) so toast
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* oids are the same between old and new clusters. This is important
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* because toast oids are stored as toast pointers in user tables.
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*
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* FYI, while pg_class.oid and pg_class.relfilenode are initially the same
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* in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
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* FULL. The new cluster will have matching pg_class.oid and
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* pg_class.relfilenode values and be based on the old oid value. This can
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* cause the old and new pg_class.relfilenode values to differ. In summary,
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* old and new pg_class.oid and new pg_class.relfilenode will have the
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* same value, and old pg_class.relfilenode might differ.
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*
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* We control all assignments of pg_type.oid because these oids are stored
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* in user composite type values.
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*
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* We control all assignments of pg_enum.oid because these oids are stored
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* in user tables as enum values.
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*
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* We control all assignments of pg_authid.oid because these oids are stored
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* in pg_largeobject_metadata.
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*/
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#include "postgres.h"
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#include "pg_upgrade.h"
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#ifdef HAVE_LANGINFO_H
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#include <langinfo.h>
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#endif
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static void prepare_new_cluster(void);
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static void prepare_new_databases(void);
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static void create_new_objects(void);
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static void copy_clog_xlog_xid(void);
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static void set_frozenxids(void);
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static void setup(char *argv0, bool *live_check);
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static void cleanup(void);
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ClusterInfo old_cluster,
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new_cluster;
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OSInfo os_info;
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char *output_files[] = {
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SERVER_LOG_FILE,
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#ifdef WIN32
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/* unique file for pg_ctl start */
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SERVER_START_LOG_FILE,
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#endif
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UTILITY_LOG_FILE,
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INTERNAL_LOG_FILE,
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NULL
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};
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int
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main(int argc, char **argv)
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{
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char *sequence_script_file_name = NULL;
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char *analyze_script_file_name = NULL;
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char *deletion_script_file_name = NULL;
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bool live_check = false;
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parseCommandLine(argc, argv);
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adjust_data_dir(&old_cluster);
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adjust_data_dir(&new_cluster);
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setup(argv[0], &live_check);
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output_check_banner(live_check);
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check_cluster_versions();
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get_sock_dir(&old_cluster, live_check);
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get_sock_dir(&new_cluster, false);
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check_cluster_compatibility(live_check);
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check_and_dump_old_cluster(live_check, &sequence_script_file_name);
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/* -- NEW -- */
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start_postmaster(&new_cluster, true);
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check_new_cluster();
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report_clusters_compatible();
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pg_log(PG_REPORT, "\nPerforming Upgrade\n");
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pg_log(PG_REPORT, "------------------\n");
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prepare_new_cluster();
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stop_postmaster(false);
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/*
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* Destructive Changes to New Cluster
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*/
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copy_clog_xlog_xid();
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/* New now using xids of the old system */
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/* -- NEW -- */
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start_postmaster(&new_cluster, true);
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prepare_new_databases();
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create_new_objects();
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stop_postmaster(false);
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/*
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* Most failures happen in create_new_objects(), which has completed at
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* this point. We do this here because it is just before linking, which
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* will link the old and new cluster data files, preventing the old
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* cluster from being safely started once the new cluster is started.
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*/
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if (user_opts.transfer_mode == TRANSFER_MODE_LINK)
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disable_old_cluster();
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transfer_all_new_tablespaces(&old_cluster.dbarr, &new_cluster.dbarr,
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old_cluster.pgdata, new_cluster.pgdata);
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/*
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* Assuming OIDs are only used in system tables, there is no need to
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* restore the OID counter because we have not transferred any OIDs from
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* the old system, but we do it anyway just in case. We do it late here
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* because there is no need to have the schema load use new oids.
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*/
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prep_status("Setting next OID for new cluster");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/pg_resetxlog\" -o %u \"%s\"",
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new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid,
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new_cluster.pgdata);
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check_ok();
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prep_status("Sync data directory to disk");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/initdb\" --sync-only \"%s\"", new_cluster.bindir,
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new_cluster.pgdata);
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check_ok();
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create_script_for_cluster_analyze(&analyze_script_file_name);
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create_script_for_old_cluster_deletion(&deletion_script_file_name);
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issue_warnings(sequence_script_file_name);
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pg_log(PG_REPORT, "\nUpgrade Complete\n");
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pg_log(PG_REPORT, "----------------\n");
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output_completion_banner(analyze_script_file_name,
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deletion_script_file_name);
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pg_free(analyze_script_file_name);
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pg_free(deletion_script_file_name);
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pg_free(sequence_script_file_name);
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cleanup();
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return 0;
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}
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static void
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setup(char *argv0, bool *live_check)
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{
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char exec_path[MAXPGPATH]; /* full path to my executable */
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/*
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* make sure the user has a clean environment, otherwise, we may confuse
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* libpq when we connect to one (or both) of the servers.
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*/
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check_pghost_envvar();
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verify_directories();
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/* no postmasters should be running, except for a live check */
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if (pid_lock_file_exists(old_cluster.pgdata))
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{
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/*
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* If we have a postmaster.pid file, try to start the server. If
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* it starts, the pid file was stale, so stop the server. If it
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* doesn't start, assume the server is running. If the pid file
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* is left over from a server crash, this also allows any committed
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* transactions stored in the WAL to be replayed so they are not
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* lost, because WAL files are not transfered from old to new
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* servers.
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*/
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if (start_postmaster(&old_cluster, false))
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stop_postmaster(false);
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else
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{
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if (!user_opts.check)
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pg_log(PG_FATAL, "There seems to be a postmaster servicing the old cluster.\n"
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"Please shutdown that postmaster and try again.\n");
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else
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*live_check = true;
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}
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}
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/* same goes for the new postmaster */
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if (pid_lock_file_exists(new_cluster.pgdata))
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{
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if (start_postmaster(&new_cluster, false))
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stop_postmaster(false);
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else
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pg_log(PG_FATAL, "There seems to be a postmaster servicing the new cluster.\n"
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"Please shutdown that postmaster and try again.\n");
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}
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/* get path to pg_upgrade executable */
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if (find_my_exec(argv0, exec_path) < 0)
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pg_log(PG_FATAL, "Could not get path name to pg_upgrade: %s\n", getErrorText(errno));
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/* Trim off program name and keep just path */
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*last_dir_separator(exec_path) = '\0';
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canonicalize_path(exec_path);
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os_info.exec_path = pg_strdup(exec_path);
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}
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static void
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prepare_new_cluster(void)
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{
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/*
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* It would make more sense to freeze after loading the schema, but that
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* would cause us to lose the frozenids restored by the load. We use
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* --analyze so autovacuum doesn't update statistics later
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*/
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prep_status("Analyzing all rows in the new cluster");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/vacuumdb\" %s --all --analyze %s",
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new_cluster.bindir, cluster_conn_opts(&new_cluster),
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log_opts.verbose ? "--verbose" : "");
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check_ok();
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/*
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* We do freeze after analyze so pg_statistic is also frozen. template0 is
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* not frozen here, but data rows were frozen by initdb, and we set its
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* datfrozenxid and relfrozenxids later to match the new xid counter
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* later.
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*/
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prep_status("Freezing all rows on the new cluster");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/vacuumdb\" %s --all --freeze %s",
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new_cluster.bindir, cluster_conn_opts(&new_cluster),
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log_opts.verbose ? "--verbose" : "");
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check_ok();
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get_pg_database_relfilenode(&new_cluster);
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}
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static void
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prepare_new_databases(void)
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{
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/*
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* We set autovacuum_freeze_max_age to its maximum value so autovacuum
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* does not launch here and delete clog files, before the frozen xids are
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* set.
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*/
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set_frozenxids();
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prep_status("Restoring global objects in the new cluster");
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/*
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* Install support functions in the global-object restore database to
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* preserve pg_authid.oid. pg_dumpall uses 'template0' as its template
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* database so objects we add into 'template1' are not propogated. They
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* are removed on pg_upgrade exit.
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*/
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install_support_functions_in_new_db("template1");
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/*
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* We have to create the databases first so we can install support
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* functions in all the other databases. Ideally we could create the
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* support functions in template1 but pg_dumpall creates database using
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* the template0 template.
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*/
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s\"",
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new_cluster.bindir, cluster_conn_opts(&new_cluster),
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GLOBALS_DUMP_FILE);
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check_ok();
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/* we load this to get a current list of databases */
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get_db_and_rel_infos(&new_cluster);
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}
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static void
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create_new_objects(void)
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{
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int dbnum;
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prep_status("Adding support functions to new cluster");
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/*
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* Technically, we only need to install these support functions in new
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* databases that also exist in the old cluster, but for completeness
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* we process all new databases.
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*/
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for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
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{
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DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
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/* skip db we already installed */
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if (strcmp(new_db->db_name, "template1") != 0)
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install_support_functions_in_new_db(new_db->db_name);
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}
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check_ok();
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prep_status("Restoring database schemas in the new cluster\n");
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for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
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{
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char sql_file_name[MAXPGPATH], log_file_name[MAXPGPATH];
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DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
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pg_log(PG_STATUS, "%s", old_db->db_name);
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snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
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snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
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/*
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* pg_dump only produces its output at the end, so there is little
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* parallelism if using the pipe.
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*/
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parallel_exec_prog(log_file_name, NULL,
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"\"%s/pg_restore\" %s --exit-on-error --verbose --dbname \"%s\" \"%s\"",
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new_cluster.bindir, cluster_conn_opts(&new_cluster),
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old_db->db_name, sql_file_name);
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}
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/* reap all children */
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while (reap_child(true) == true)
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;
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end_progress_output();
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check_ok();
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/* regenerate now that we have objects in the databases */
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get_db_and_rel_infos(&new_cluster);
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uninstall_support_functions_from_new_cluster();
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}
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/*
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* Delete the given subdirectory contents from the new cluster, and copy the
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* files from the old cluster into it.
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*/
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static void
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copy_subdir_files(char *subdir)
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{
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char old_path[MAXPGPATH];
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char new_path[MAXPGPATH];
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prep_status("Deleting files from new %s", subdir);
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snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, subdir);
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snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
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if (!rmtree(new_path, true))
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pg_log(PG_FATAL, "could not delete directory \"%s\"\n", new_path);
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check_ok();
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prep_status("Copying old %s to new server", subdir);
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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#ifndef WIN32
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"cp -Rf \"%s\" \"%s\"",
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#else
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/* flags: everything, no confirm, quiet, overwrite read-only */
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"xcopy /e /y /q /r \"%s\" \"%s\\\"",
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#endif
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old_path, new_path);
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check_ok();
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}
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static void
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copy_clog_xlog_xid(void)
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{
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/* copy old commit logs to new data dir */
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copy_subdir_files("pg_clog");
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/* set the next transaction id of the new cluster */
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prep_status("Setting next transaction ID for new cluster");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/pg_resetxlog\" -f -x %u \"%s\"",
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new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
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new_cluster.pgdata);
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check_ok();
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/*
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* If both new and old are after the pg_multixact change commit, copy those
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* files too. If the old server is before that change and the new server
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* is after, then we don't copy anything but we need to reset pg_control so
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* that the new server doesn't attempt to read multis older than the cutoff
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* value.
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*/
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if (old_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER &&
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new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
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{
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copy_subdir_files("pg_multixact/offsets");
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copy_subdir_files("pg_multixact/members");
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prep_status("Setting next multixact ID and offset for new cluster");
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/*
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* we preserve all files and contents, so we must preserve both "next"
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* counters here and the oldest multi present on system.
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*/
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/pg_resetxlog\" -O %u -m %u,%u \"%s\"",
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new_cluster.bindir,
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old_cluster.controldata.chkpnt_nxtmxoff,
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old_cluster.controldata.chkpnt_nxtmulti,
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old_cluster.controldata.chkpnt_oldstMulti,
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new_cluster.pgdata);
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check_ok();
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}
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else if (new_cluster.controldata.cat_ver >= MULTIXACT_FORMATCHANGE_CAT_VER)
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{
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prep_status("Setting oldest multixact ID on new cluster");
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/*
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* We don't preserve files in this case, but it's important that the
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* oldest multi is set to the latest value used by the old system, so
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* that multixact.c returns the empty set for multis that might be
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* present on disk. We set next multi to the value following that; it
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* might end up wrapped around (i.e. 0) if the old cluster had
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* next=MaxMultiXactId, but multixact.c can cope with that just fine.
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*/
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/pg_resetxlog\" -m %u,%u \"%s\"",
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new_cluster.bindir,
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old_cluster.controldata.chkpnt_nxtmulti + 1,
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old_cluster.controldata.chkpnt_nxtmulti,
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new_cluster.pgdata);
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check_ok();
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}
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/* now reset the wal archives in the new cluster */
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prep_status("Resetting WAL archives");
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exec_prog(UTILITY_LOG_FILE, NULL, true,
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"\"%s/pg_resetxlog\" -l %s \"%s\"", new_cluster.bindir,
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old_cluster.controldata.nextxlogfile,
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new_cluster.pgdata);
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check_ok();
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}
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|
|
|
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/*
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* set_frozenxids()
|
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*
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* We have frozen all xids, so set relfrozenxid and datfrozenxid
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* to be the old cluster's xid counter, which we just set in the new
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* cluster. User-table frozenxid values will be set by pg_dumpall
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* --binary-upgrade, but objects not set by the pg_dump must have
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* proper frozen counters.
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*/
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static
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void
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set_frozenxids(void)
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{
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int dbnum;
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PGconn *conn,
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*conn_template1;
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PGresult *dbres;
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int ntups;
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int i_datname;
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int i_datallowconn;
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prep_status("Setting frozenxid counters in new cluster");
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conn_template1 = connectToServer(&new_cluster, "template1");
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/* set pg_database.datfrozenxid */
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PQclear(executeQueryOrDie(conn_template1,
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"UPDATE pg_catalog.pg_database "
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"SET datfrozenxid = '%u'",
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old_cluster.controldata.chkpnt_nxtxid));
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|
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/* get database names */
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dbres = executeQueryOrDie(conn_template1,
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"SELECT datname, datallowconn "
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"FROM pg_catalog.pg_database");
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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)
|
|
{
|
|
|
|
fclose(log_opts.internal);
|
|
|
|
/* Remove dump and log files? */
|
|
if (!log_opts.retain)
|
|
{
|
|
int dbnum;
|
|
char **filename;
|
|
|
|
for (filename = output_files; *filename != NULL; filename++)
|
|
unlink(*filename);
|
|
|
|
/* remove dump files */
|
|
unlink(GLOBALS_DUMP_FILE);
|
|
|
|
if (old_cluster.dbarr.dbs)
|
|
for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
|
|
{
|
|
char sql_file_name[MAXPGPATH], log_file_name[MAXPGPATH];
|
|
DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
|
|
|
|
snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
|
|
unlink(sql_file_name);
|
|
|
|
snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
|
|
unlink(log_file_name);
|
|
}
|
|
}
|
|
}
|