/
pg_repack.c
2243 lines (1959 loc) · 64.6 KB
/
pg_repack.c
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/*
* pg_repack.c: bin/pg_repack.c
*
* Portions Copyright (c) 2008-2011, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
* Portions Copyright (c) 2011, Itagaki Takahiro
* Portions Copyright (c) 2012-2015, The Reorg Development Team
*/
/**
* @brief Client Modules
*/
const char *PROGRAM_URL = "https://reorg.github.io/pg_repack/";
const char *PROGRAM_ISSUES = "https://github.com/reorg/pg_repack/issues";
#ifdef REPACK_VERSION
/* macro trick to stringify a macro expansion */
#define xstr(s) str(s)
#define str(s) #s
const char *PROGRAM_VERSION = xstr(REPACK_VERSION);
#else
const char *PROGRAM_VERSION = "unknown";
#endif
#include "pgut/pgut-fe.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
/*
* APPLY_COUNT: Number of applied logs per transaction. Larger values
* could be faster, but will be long transactions in the REDO phase.
*/
#define APPLY_COUNT 1000
/* Once we get down to seeing fewer than this many tuples in the
* log table, we'll say that we're ready to perform the switch.
*/
#define MIN_TUPLES_BEFORE_SWITCH 20
/* poll() or select() timeout, in seconds */
#define POLL_TIMEOUT 3
/* Compile an array of existing transactions which are active during
* pg_repack's setup. Some transactions we can safely ignore:
* a. The '1/1, -1/0' lock skipped is from the bgwriter on newly promoted
* servers. See https://github.com/reorg/pg_reorg/issues/1
* b. Our own database connections
* c. Other pg_repack clients, as distinguished by application_name, which
* may be operating on other tables at the same time. See
* https://github.com/reorg/pg_repack/issues/1
* d. open transactions/locks existing on other databases than the actual
* processing relation (except for locks on shared objects)
* e. VACUUMs which are always executed outside transaction blocks.
*
* Note, there is some redundancy in how the filtering is done (e.g. excluding
* based on pg_backend_pid() and application_name), but that shouldn't hurt
* anything. Also, the test of application_name is not bulletproof -- for
* instance, the application name when running installcheck will be
* pg_regress.
*/
#define SQL_XID_SNAPSHOT_90200 \
"SELECT repack.array_accum(l.virtualtransaction) " \
" FROM pg_locks AS l " \
" LEFT JOIN pg_stat_activity AS a " \
" ON l.pid = a.pid " \
" LEFT JOIN pg_database AS d " \
" ON a.datid = d.oid " \
" WHERE l.locktype = 'virtualxid' " \
" AND l.pid NOT IN (pg_backend_pid(), $1) " \
" AND (l.virtualxid, l.virtualtransaction) <> ('1/1', '-1/0') " \
" AND (a.application_name IS NULL OR a.application_name <> $2)" \
" AND a.query !~* E'^\\\\s*vacuum\\\\s+' " \
" AND a.query !~ E'^autovacuum: ' " \
" AND ((d.datname IS NULL OR d.datname = current_database()) OR l.database = 0)"
#define SQL_XID_SNAPSHOT_90000 \
"SELECT repack.array_accum(l.virtualtransaction) " \
" FROM pg_locks AS l " \
" LEFT JOIN pg_stat_activity AS a " \
" ON l.pid = a.procpid " \
" LEFT JOIN pg_database AS d " \
" ON a.datid = d.oid " \
" WHERE l.locktype = 'virtualxid' " \
" AND l.pid NOT IN (pg_backend_pid(), $1) " \
" AND (l.virtualxid, l.virtualtransaction) <> ('1/1', '-1/0') " \
" AND (a.application_name IS NULL OR a.application_name <> $2)" \
" AND a.current_query !~* E'^\\\\s*vacuum\\\\s+' " \
" AND a.current_query !~ E'^autovacuum: ' " \
" AND ((d.datname IS NULL OR d.datname = current_database()) OR l.database = 0)"
/* application_name is not available before 9.0. The last clause of
* the WHERE clause is just to eat the $2 parameter (application name).
*/
#define SQL_XID_SNAPSHOT_80300 \
"SELECT repack.array_accum(l.virtualtransaction) " \
" FROM pg_locks AS l" \
" LEFT JOIN pg_stat_activity AS a " \
" ON l.pid = a.procpid " \
" LEFT JOIN pg_database AS d " \
" ON a.datid = d.oid " \
" WHERE l.locktype = 'virtualxid' AND l.pid NOT IN (pg_backend_pid(), $1)" \
" AND (l.virtualxid, l.virtualtransaction) <> ('1/1', '-1/0') " \
" AND a.current_query !~* E'^\\\\s*vacuum\\\\s+' " \
" AND a.current_query !~ E'^autovacuum: ' " \
" AND ((d.datname IS NULL OR d.datname = current_database()) OR l.database = 0)" \
" AND ($2::text IS NOT NULL)"
#define SQL_XID_SNAPSHOT \
(PQserverVersion(connection) >= 90200 ? SQL_XID_SNAPSHOT_90200 : \
(PQserverVersion(connection) >= 90000 ? SQL_XID_SNAPSHOT_90000 : \
SQL_XID_SNAPSHOT_80300))
/* Later, check whether any of the transactions we saw before are still
* alive, and wait for them to go away.
*/
#define SQL_XID_ALIVE \
"SELECT pid FROM pg_locks WHERE locktype = 'virtualxid'"\
" AND pid <> pg_backend_pid() AND virtualtransaction = ANY($1)"
/* To be run while our main connection holds an AccessExclusive lock on the
* target table, and our secondary conn is attempting to grab an AccessShare
* lock. We know that "granted" must be false for these queries because
* we already hold the AccessExclusive lock. Also, we only care about other
* transactions trying to grab an ACCESS EXCLUSIVE lock, because we are only
* trying to kill off disallowed DDL commands, e.g. ALTER TABLE or TRUNCATE.
*/
#define CANCEL_COMPETING_LOCKS \
"SELECT pg_cancel_backend(pid) FROM pg_locks WHERE locktype = 'relation'"\
" AND granted = false AND relation = %u"\
" AND mode = 'AccessExclusiveLock' AND pid <> pg_backend_pid()"
#define KILL_COMPETING_LOCKS \
"SELECT pg_terminate_backend(pid) "\
"FROM pg_locks WHERE locktype = 'relation'"\
" AND granted = false AND relation = %u"\
" AND mode = 'AccessExclusiveLock' AND pid <> pg_backend_pid()"
#define COUNT_COMPETING_LOCKS \
"SELECT pid FROM pg_locks WHERE locktype = 'relation'" \
" AND granted = false AND relation = %u" \
" AND mode = 'AccessExclusiveLock' AND pid <> pg_backend_pid()"
/* Will be used as a unique prefix for advisory locks. */
#define REPACK_LOCK_PREFIX_STR "16185446"
typedef enum
{
UNPROCESSED,
INPROGRESS,
FINISHED
} index_status_t;
/*
* per-index information
*/
typedef struct repack_index
{
Oid target_oid; /* target: OID */
const char *create_index; /* CREATE INDEX */
index_status_t status; /* Track parallel build statuses. */
int worker_idx; /* which worker conn is handling */
} repack_index;
/*
* per-table information
*/
typedef struct repack_table
{
const char *target_name; /* target: relname */
Oid target_oid; /* target: OID */
Oid target_toast; /* target: toast OID */
Oid target_tidx; /* target: toast index OID */
Oid pkid; /* target: PK OID */
Oid ckid; /* target: CK OID */
const char *create_pktype; /* CREATE TYPE pk */
const char *create_log; /* CREATE TABLE log */
const char *create_trigger; /* CREATE TRIGGER repack_trigger */
const char *enable_trigger; /* ALTER TABLE ENABLE ALWAYS TRIGGER repack_trigger */
const char *create_table; /* CREATE TABLE table AS SELECT WITH NO DATA*/
const char *copy_data; /* INSERT INTO */
const char *alter_col_storage; /* ALTER TABLE ALTER COLUMN SET STORAGE */
const char *drop_columns; /* ALTER TABLE DROP COLUMNs */
const char *delete_log; /* DELETE FROM log */
const char *lock_table; /* LOCK TABLE table */
const char *sql_peek; /* SQL used in flush */
const char *sql_insert; /* SQL used in flush */
const char *sql_delete; /* SQL used in flush */
const char *sql_update; /* SQL used in flush */
const char *sql_pop; /* SQL used in flush */
int n_indexes; /* number of indexes */
repack_index *indexes; /* info on each index */
} repack_table;
static bool is_superuser(void);
static void check_tablespace(void);
static bool preliminary_checks(char *errbuf, size_t errsize);
static void repack_all_databases(const char *order_by);
static bool repack_one_database(const char *order_by, char *errbuf, size_t errsize);
static void repack_one_table(repack_table *table, const char *order_by);
static bool repack_table_indexes(PGresult *index_details);
static bool repack_all_indexes(char *errbuf, size_t errsize);
static void repack_cleanup(bool fatal, const repack_table *table);
static void repack_cleanup_callback(bool fatal, void *userdata);
static bool rebuild_indexes(const repack_table *table);
static char *getstr(PGresult *res, int row, int col);
static Oid getoid(PGresult *res, int row, int col);
static bool advisory_lock(PGconn *conn, const char *relid);
static bool lock_exclusive(PGconn *conn, const char *relid, const char *lock_query, bool start_xact);
static bool kill_ddl(PGconn *conn, Oid relid, bool terminate);
static bool lock_access_share(PGconn *conn, Oid relid, const char *target_name);
#define SQLSTATE_INVALID_SCHEMA_NAME "3F000"
#define SQLSTATE_UNDEFINED_FUNCTION "42883"
#define SQLSTATE_QUERY_CANCELED "57014"
static bool sqlstate_equals(PGresult *res, const char *state)
{
return strcmp(PQresultErrorField(res, PG_DIAG_SQLSTATE), state) == 0;
}
static bool analyze = true;
static bool alldb = false;
static bool noorder = false;
static SimpleStringList parent_table_list = {NULL, NULL};
static SimpleStringList table_list = {NULL, NULL};
static SimpleStringList schema_list = {NULL, NULL};
static char *orderby = NULL;
static char *tablespace = NULL;
static bool moveidx = false;
static SimpleStringList r_index = {NULL, NULL};
static bool only_indexes = false;
static int wait_timeout = 60; /* in seconds */
static int jobs = 0; /* number of concurrent worker conns. */
static bool dryrun = false;
static unsigned int temp_obj_num = 0; /* temporary objects counter */
static bool no_kill_backend = false; /* abandon when timed-out */
static bool no_superuser_check = false;
static SimpleStringList exclude_extension_list = {NULL, NULL}; /* don't repack tables of these extensions */
/* buffer should have at least 11 bytes */
static char *
utoa(unsigned int value, char *buffer)
{
sprintf(buffer, "%u", value);
return buffer;
}
static pgut_option options[] =
{
{ 'b', 'a', "all", &alldb },
{ 'l', 't', "table", &table_list },
{ 'l', 'I', "parent-table", &parent_table_list },
{ 'l', 'c', "schema", &schema_list },
{ 'b', 'n', "no-order", &noorder },
{ 'b', 'N', "dry-run", &dryrun },
{ 's', 'o', "order-by", &orderby },
{ 's', 's', "tablespace", &tablespace },
{ 'b', 'S', "moveidx", &moveidx },
{ 'l', 'i', "index", &r_index },
{ 'b', 'x', "only-indexes", &only_indexes },
{ 'i', 'T', "wait-timeout", &wait_timeout },
{ 'B', 'Z', "no-analyze", &analyze },
{ 'i', 'j', "jobs", &jobs },
{ 'b', 'D', "no-kill-backend", &no_kill_backend },
{ 'b', 'k', "no-superuser-check", &no_superuser_check },
{ 'l', 'C', "exclude-extension", &exclude_extension_list },
{ 0 },
};
int
main(int argc, char *argv[])
{
int i;
char errbuf[256];
i = pgut_getopt(argc, argv, options);
if (i == argc - 1)
dbname = argv[i];
else if (i < argc)
ereport(ERROR,
(errcode(EINVAL),
errmsg("too many arguments")));
check_tablespace();
if (dryrun)
elog(INFO, "Dry run enabled, not executing repack");
if (r_index.head || only_indexes)
{
if (r_index.head && table_list.head)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot specify --index (-i) and --table (-t)")));
if (r_index.head && parent_table_list.head)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot specify --index (-i) and --parent-table (-I)")));
else if (r_index.head && only_indexes)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot specify --index (-i) and --only-indexes (-x)")));
else if (r_index.head && exclude_extension_list.head)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot specify --index (-i) and --exclude-extension (-C)")));
else if (only_indexes && !(table_list.head || parent_table_list.head))
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot repack all indexes of database, specify the table(s)"
"via --table (-t) or --parent-table (-I)")));
else if (only_indexes && exclude_extension_list.head)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot specify --only-indexes (-x) and --exclude-extension (-C)")));
else if (alldb)
ereport(ERROR, (errcode(EINVAL),
errmsg("cannot repack specific index(es) in all databases")));
else
{
if (orderby)
ereport(WARNING, (errcode(EINVAL),
errmsg("option -o (--order-by) has no effect while repacking indexes")));
else if (noorder)
ereport(WARNING, (errcode(EINVAL),
errmsg("option -n (--no-order) has no effect while repacking indexes")));
else if (!analyze)
ereport(WARNING, (errcode(EINVAL),
errmsg("ANALYZE is not performed after repacking indexes, -z (--no-analyze) has no effect")));
else if (jobs)
ereport(WARNING, (errcode(EINVAL),
errmsg("option -j (--jobs) has no effect, repacking indexes does not use parallel jobs")));
if (!repack_all_indexes(errbuf, sizeof(errbuf)))
ereport(ERROR,
(errcode(ERROR), errmsg("%s", errbuf)));
}
}
else
{
if (schema_list.head && (table_list.head || parent_table_list.head))
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot repack specific table(s) in schema, use schema.table notation instead")));
if (exclude_extension_list.head && table_list.head)
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot specify --table (-t) and --exclude-extension (-C)")));
if (exclude_extension_list.head && parent_table_list.head)
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot specify --parent-table (-I) and --exclude-extension (-C)")));
if (noorder)
orderby = "";
if (alldb)
{
if (table_list.head || parent_table_list.head)
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot repack specific table(s) in all databases")));
if (schema_list.head)
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot repack specific schema(s) in all databases")));
repack_all_databases(orderby);
}
else
{
if (!repack_one_database(orderby, errbuf, sizeof(errbuf)))
ereport(ERROR,
(errcode(ERROR), errmsg("%s failed with error: %s", PROGRAM_NAME, errbuf)));
}
}
return 0;
}
/*
* Test if the current user is a database superuser.
* Borrowed from psql/common.c
*
* Note: this will correctly detect superuserness only with a protocol-3.0
* or newer backend; otherwise it will always say "false".
*/
bool
is_superuser(void)
{
const char *val;
if (no_superuser_check)
return true;
if (!connection)
return false;
val = PQparameterStatus(connection, "is_superuser");
if (val && strcmp(val, "on") == 0)
return true;
return false;
}
/*
* Check if the tablespace requested exists.
*
* Raise an exception on error.
*/
void
check_tablespace()
{
PGresult *res = NULL;
const char *params[1];
if (tablespace == NULL)
{
/* nothing to check, but let's see the options */
if (moveidx)
{
ereport(ERROR,
(errcode(EINVAL),
errmsg("cannot specify --moveidx (-S) without --tablespace (-s)")));
}
return;
}
/* check if the tablespace exists */
reconnect(ERROR);
params[0] = tablespace;
res = execute_elevel(
"select spcname from pg_tablespace where spcname = $1",
1, params, DEBUG2);
if (PQresultStatus(res) == PGRES_TUPLES_OK)
{
if (PQntuples(res) == 0)
{
ereport(ERROR,
(errcode(EINVAL),
errmsg("the tablespace \"%s\" doesn't exist", tablespace)));
}
}
else
{
ereport(ERROR,
(errcode(EINVAL),
errmsg("error checking the namespace: %s",
PQerrorMessage(connection))));
}
CLEARPGRES(res);
}
/*
* Perform sanity checks before beginning work. Make sure pg_repack is
* installed in the database, the user is a superuser, etc.
*/
static bool
preliminary_checks(char *errbuf, size_t errsize){
bool ret = false;
PGresult *res = NULL;
if (!is_superuser()) {
if (errbuf)
snprintf(errbuf, errsize, "You must be a superuser to use %s",
PROGRAM_NAME);
goto cleanup;
}
/* Query the extension version. Exit if no match */
res = execute_elevel("select repack.version(), repack.version_sql()",
0, NULL, DEBUG2);
if (PQresultStatus(res) == PGRES_TUPLES_OK)
{
const char *libver;
char buf[64];
/* the string is something like "pg_repack 1.1.7" */
snprintf(buf, sizeof(buf), "%s %s", PROGRAM_NAME, PROGRAM_VERSION);
/* check the version of the C library */
libver = getstr(res, 0, 0);
if (0 != strcmp(buf, libver))
{
if (errbuf)
snprintf(errbuf, errsize,
"program '%s' does not match database library '%s'",
buf, libver);
goto cleanup;
}
/* check the version of the SQL extension */
libver = getstr(res, 0, 1);
if (0 != strcmp(buf, libver))
{
if (errbuf)
snprintf(errbuf, errsize,
"extension '%s' required, found extension '%s'",
buf, libver);
goto cleanup;
}
}
else
{
if (sqlstate_equals(res, SQLSTATE_INVALID_SCHEMA_NAME)
|| sqlstate_equals(res, SQLSTATE_UNDEFINED_FUNCTION))
{
/* Schema repack does not exist, or version too old (version
* functions not found). Skip the database.
*/
if (errbuf)
snprintf(errbuf, errsize,
"%s %s is not installed in the database",
PROGRAM_NAME, PROGRAM_VERSION);
}
else
{
/* Return the error message otherwise */
if (errbuf)
snprintf(errbuf, errsize, "%s", PQerrorMessage(connection));
}
goto cleanup;
}
CLEARPGRES(res);
/* Disable statement timeout. */
command("SET statement_timeout = 0", 0, NULL);
/* Restrict search_path to system catalog. */
command("SET search_path = pg_catalog, pg_temp, public", 0, NULL);
/* To avoid annoying "create implicit ..." messages. */
command("SET client_min_messages = warning", 0, NULL);
ret = true;
cleanup:
CLEARPGRES(res);
return ret;
}
/*
* Call repack_one_database for each database.
*/
static void
repack_all_databases(const char *orderby)
{
PGresult *result;
int i;
dbname = "postgres";
reconnect(ERROR);
if (!is_superuser())
elog(ERROR, "You must be a superuser to use %s", PROGRAM_NAME);
result = execute("SELECT datname FROM pg_database WHERE datallowconn ORDER BY 1;", 0, NULL);
disconnect();
for (i = 0; i < PQntuples(result); i++)
{
bool ret;
char errbuf[256];
dbname = PQgetvalue(result, i, 0);
elog(INFO, "repacking database \"%s\"", dbname);
if (!dryrun)
{
ret = repack_one_database(orderby, errbuf, sizeof(errbuf));
if (!ret)
elog(INFO, "database \"%s\" skipped: %s", dbname, errbuf);
}
}
CLEARPGRES(result);
}
/* result is not copied */
static char *
getstr(PGresult *res, int row, int col)
{
if (PQgetisnull(res, row, col))
return NULL;
else
return PQgetvalue(res, row, col);
}
static Oid
getoid(PGresult *res, int row, int col)
{
if (PQgetisnull(res, row, col))
return InvalidOid;
else
return (Oid)strtoul(PQgetvalue(res, row, col), NULL, 10);
}
/*
* Call repack_one_table for the target tables or each table in a database.
*/
static bool
repack_one_database(const char *orderby, char *errbuf, size_t errsize)
{
bool ret = false;
PGresult *res = NULL;
int i;
int num;
StringInfoData sql;
SimpleStringListCell *cell;
const char **params = NULL;
int iparam = 0;
size_t num_parent_tables,
num_tables,
num_schemas,
num_params,
num_excluded_extensions;
num_parent_tables = simple_string_list_size(parent_table_list);
num_tables = simple_string_list_size(table_list);
num_schemas = simple_string_list_size(schema_list);
num_excluded_extensions = simple_string_list_size(exclude_extension_list);
/* 1st param is the user-specified tablespace */
num_params = num_excluded_extensions +
num_parent_tables +
num_tables +
num_schemas + 1;
params = pgut_malloc(num_params * sizeof(char *));
initStringInfo(&sql);
reconnect(ERROR);
/* No sense in setting up concurrent workers if --jobs=1 */
if (jobs > 1)
setup_workers(jobs);
if (!preliminary_checks(errbuf, errsize))
goto cleanup;
/* acquire target tables */
appendStringInfoString(&sql,
"SELECT t.*,"
" coalesce(v.tablespace, t.tablespace_orig) as tablespace_dest"
" FROM repack.tables t, "
" (VALUES (quote_ident($1::text))) as v (tablespace)"
" WHERE ");
params[iparam++] = tablespace;
if (num_tables || num_parent_tables)
{
/* standalone tables */
if (num_tables)
{
appendStringInfoString(&sql, "(");
for (cell = table_list.head; cell; cell = cell->next)
{
/* Construct table name placeholders to be used by PQexecParams */
appendStringInfo(&sql, "relid = $%d::regclass", iparam + 1);
params[iparam++] = cell->val;
if (cell->next)
appendStringInfoString(&sql, " OR ");
}
appendStringInfoString(&sql, ")");
}
if (num_tables && num_parent_tables)
appendStringInfoString(&sql, " OR ");
/* parent tables + inherited children */
if (num_parent_tables)
{
appendStringInfoString(&sql, "(");
for (cell = parent_table_list.head; cell; cell = cell->next)
{
/* Construct table name placeholders to be used by PQexecParams */
appendStringInfo(&sql,
"relid = ANY(repack.get_table_and_inheritors($%d::regclass))",
iparam + 1);
params[iparam++] = cell->val;
if (cell->next)
appendStringInfoString(&sql, " OR ");
}
appendStringInfoString(&sql, ")");
}
}
else if (num_schemas)
{
appendStringInfoString(&sql, "schemaname IN (");
for (cell = schema_list.head; cell; cell = cell->next)
{
/* Construct schema name placeholders to be used by PQexecParams */
appendStringInfo(&sql, "$%d", iparam + 1);
params[iparam++] = cell->val;
if (cell->next)
appendStringInfoString(&sql, ", ");
}
appendStringInfoString(&sql, ")");
}
else
{
appendStringInfoString(&sql, "pkid IS NOT NULL");
}
/* Exclude tables which belong to extensions */
if (exclude_extension_list.head)
{
appendStringInfoString(&sql, " AND t.relid NOT IN"
" (SELECT d.objid::regclass"
" FROM pg_depend d JOIN pg_extension e"
" ON d.refobjid = e.oid"
" WHERE d.classid = 'pg_class'::regclass AND (");
/* List all excluded extensions */
for (cell = exclude_extension_list.head; cell; cell = cell->next)
{
appendStringInfo(&sql, "e.extname = $%d", iparam + 1);
params[iparam++] = cell->val;
appendStringInfoString(&sql, cell->next ? " OR " : ")");
}
/* Close subquery */
appendStringInfoString(&sql, ")");
}
/* Ensure the regression tests get a consistent ordering of tables */
appendStringInfoString(&sql, " ORDER BY t.relname, t.schemaname");
/* double check the parameters array is sane */
if (iparam != num_params)
{
if (errbuf)
snprintf(errbuf, errsize,
"internal error: bad parameters count: %i instead of %zi",
iparam, num_params);
goto cleanup;
}
res = execute_elevel(sql.data, (int) num_params, params, DEBUG2);
/* on error skip the database */
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
/* Return the error message otherwise */
if (errbuf)
snprintf(errbuf, errsize, "%s", PQerrorMessage(connection));
goto cleanup;
}
num = PQntuples(res);
for (i = 0; i < num; i++)
{
repack_table table;
StringInfoData copy_sql;
const char *create_table_1;
const char *create_table_2;
const char *tablespace;
const char *ckey;
int c = 0;
table.target_name = getstr(res, i, c++);
table.target_oid = getoid(res, i, c++);
table.target_toast = getoid(res, i, c++);
table.target_tidx = getoid(res, i, c++);
c++; // Skip schemaname
table.pkid = getoid(res, i, c++);
table.ckid = getoid(res, i, c++);
if (table.pkid == 0) {
ereport(WARNING,
(errcode(E_PG_COMMAND),
errmsg("relation \"%s\" must have a primary key or not-null unique keys", table.target_name)));
continue;
}
table.create_pktype = getstr(res, i, c++);
table.create_log = getstr(res, i, c++);
table.create_trigger = getstr(res, i, c++);
table.enable_trigger = getstr(res, i, c++);
create_table_1 = getstr(res, i, c++);
tablespace = getstr(res, i, c++); /* to be clobbered */
create_table_2 = getstr(res, i, c++);
table.copy_data = getstr(res, i , c++);
table.alter_col_storage = getstr(res, i, c++);
table.drop_columns = getstr(res, i, c++);
table.delete_log = getstr(res, i, c++);
table.lock_table = getstr(res, i, c++);
ckey = getstr(res, i, c++);
table.sql_peek = getstr(res, i, c++);
table.sql_insert = getstr(res, i, c++);
table.sql_delete = getstr(res, i, c++);
table.sql_update = getstr(res, i, c++);
table.sql_pop = getstr(res, i, c++);
tablespace = getstr(res, i, c++);
/* Craft CREATE TABLE SQL */
resetStringInfo(&sql);
appendStringInfoString(&sql, create_table_1);
appendStringInfoString(&sql, tablespace);
appendStringInfoString(&sql, create_table_2);
/* Always append WITH NO DATA to CREATE TABLE SQL*/
appendStringInfoString(&sql, " WITH NO DATA");
table.create_table = sql.data;
/* Craft Copy SQL */
initStringInfo(©_sql);
appendStringInfoString(©_sql, table.copy_data);
if (!orderby)
{
if (ckey != NULL)
{
/* CLUSTER mode */
appendStringInfoString(©_sql, " ORDER BY ");
appendStringInfoString(©_sql, ckey);
}
/* else, VACUUM FULL mode (non-clustered tables) */
}
else if (!orderby[0])
{
/* VACUUM FULL mode (for clustered tables too), do nothing */
}
else
{
/* User specified ORDER BY */
appendStringInfoString(©_sql, " ORDER BY ");
appendStringInfoString(©_sql, orderby);
}
table.copy_data = copy_sql.data;
repack_one_table(&table, orderby);
}
ret = true;
cleanup:
CLEARPGRES(res);
disconnect();
termStringInfo(&sql);
free(params);
return ret;
}
static int
apply_log(PGconn *conn, const repack_table *table, int count)
{
int result;
PGresult *res;
const char *params[6];
char buffer[12];
params[0] = table->sql_peek;
params[1] = table->sql_insert;
params[2] = table->sql_delete;
params[3] = table->sql_update;
params[4] = table->sql_pop;
params[5] = utoa(count, buffer);
res = pgut_execute(conn,
"SELECT repack.repack_apply($1, $2, $3, $4, $5, $6)",
6, params);
result = atoi(PQgetvalue(res, 0, 0));
CLEARPGRES(res);
return result;
}
/*
* Create indexes on temp table, possibly using multiple worker connections
* concurrently if the user asked for --jobs=...
*/
static bool
rebuild_indexes(const repack_table *table)
{
PGresult *res = NULL;
int num_indexes;
int i;
int num_active_workers;
int num_workers;
repack_index *index_jobs;
bool have_error = false;
elog(DEBUG2, "---- create indexes ----");
num_indexes = table->n_indexes;
/* We might have more actual worker connections than we need,
* if the number of workers exceeds the number of indexes to be
* built. In that case, ignore the extra workers.
*/
num_workers = num_indexes > workers.num_workers ? workers.num_workers : num_indexes;
num_active_workers = num_workers;
elog(DEBUG2, "Have %d indexes and num_workers=%d", num_indexes,
num_workers);
index_jobs = table->indexes;
for (i = 0; i < num_indexes; i++)
{
elog(DEBUG2, "set up index_jobs [%d]", i);
elog(DEBUG2, "target_oid : %u", index_jobs[i].target_oid);
elog(DEBUG2, "create_index : %s", index_jobs[i].create_index);
if (num_workers <= 1) {
/* Use primary connection if we are not setting up parallel
* index building, or if we only have one worker.
*/
command(index_jobs[i].create_index, 0, NULL);
/* This bookkeeping isn't actually important in this no-workers
* case, but just for clarity.
*/
index_jobs[i].status = FINISHED;
}
else if (i < num_workers) {
/* Assign available worker to build an index. */
index_jobs[i].status = INPROGRESS;
index_jobs[i].worker_idx = i;
elog(LOG, "Initial worker %d to build index: %s",
i, index_jobs[i].create_index);
if (!(PQsendQuery(workers.conns[i], index_jobs[i].create_index)))
{
elog(WARNING, "Error sending async query: %s\n%s",
index_jobs[i].create_index,
PQerrorMessage(workers.conns[i]));
have_error = true;
goto cleanup;
}
}
/* Else we have more indexes to be built than workers
* available. That's OK, we'll get to them later.
*/
}
if (num_workers > 1)
{
int freed_worker = -1;
int ret;
/* Prefer poll() over select(), following PostgreSQL custom. */
#ifdef HAVE_POLL
struct pollfd *input_fds;
input_fds = pgut_malloc(sizeof(struct pollfd) * num_workers);
for (i = 0; i < num_workers; i++)
{
input_fds[i].fd = PQsocket(workers.conns[i]);
input_fds[i].events = POLLIN | POLLERR;
input_fds[i].revents = 0;
}
#else
fd_set input_mask;
struct timeval timeout;
/* select() needs the highest-numbered socket descriptor */
int max_fd;
#endif
/* Now go through our index builds, and look for any which is
* reported complete. Reassign that worker to the next index to
* be built, if any.
*/
while (num_active_workers > 0)
{
elog(DEBUG2, "polling %d active workers", num_active_workers);
#ifdef HAVE_POLL
ret = poll(input_fds, num_workers, POLL_TIMEOUT * 1000);
#else
/* re-initialize timeout and input_mask before each
* invocation of select(). I think this isn't
* necessary on many Unixen, but just in case.
*/
timeout.tv_sec = POLL_TIMEOUT;
timeout.tv_usec = 0;