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catchup.c
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/*-------------------------------------------------------------------------
*
* catchup.c: sync DB cluster
*
* Copyright (c) 2021, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include "pg_probackup.h"
#if PG_VERSION_NUM < 110000
#include "catalog/catalog.h"
#endif
#include "catalog/pg_tablespace.h"
#include "access/timeline.h"
#include "pgtar.h"
#include "streamutil.h"
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "utils/thread.h"
#include "utils/file.h"
/*
* Catchup routines
*/
static PGconn *catchup_init_state(PGNodeInfo *source_node_info, const char *source_pgdata, const char *dest_pgdata);
static void catchup_preflight_checks(PGNodeInfo *source_node_info, PGconn *source_conn, const char *source_pgdata,
const char *dest_pgdata);
static void catchup_check_tablespaces_existance_in_tbsmapping(PGconn *conn);
static parray* catchup_get_tli_history(ConnectionOptions *conn_opt, TimeLineID tli);
//REVIEW I'd also suggest to wrap all these fields into some CatchupState, but it isn't urgent.
//REVIEW_ANSWER what for?
/*
* Prepare for work: fill some globals, open connection to source database
*/
static PGconn *
catchup_init_state(PGNodeInfo *source_node_info, const char *source_pgdata, const char *dest_pgdata)
{
PGconn *source_conn;
/* Initialize PGInfonode */
pgNodeInit(source_node_info);
/* Get WAL segments size and system ID of source PG instance */
instance_config.xlog_seg_size = get_xlog_seg_size(source_pgdata);
instance_config.system_identifier = get_system_identifier(source_pgdata, FIO_DB_HOST, false);
current.start_time = time(NULL);
strlcpy(current.program_version, PROGRAM_VERSION, sizeof(current.program_version));
/* Do some compatibility checks and fill basic info about PG instance */
source_conn = pgdata_basic_setup(instance_config.conn_opt, source_node_info);
#if PG_VERSION_NUM >= 110000
if (!RetrieveWalSegSize(source_conn))
elog(ERROR, "Failed to retrieve wal_segment_size");
#endif
get_ptrack_version(source_conn, source_node_info);
if (source_node_info->ptrack_version_num > 0)
source_node_info->is_ptrack_enabled = pg_is_ptrack_enabled(source_conn, source_node_info->ptrack_version_num);
/* Obtain current timeline */
#if PG_VERSION_NUM >= 90600
current.tli = get_current_timeline(source_conn);
#else
instance_config.pgdata = source_pgdata;
current.tli = get_current_timeline_from_control(source_pgdata, FIO_DB_HOST, false);
#endif
elog(INFO, "Catchup start, pg_probackup version: %s, "
"PostgreSQL version: %s, "
"remote: %s, source-pgdata: %s, destination-pgdata: %s",
PROGRAM_VERSION, source_node_info->server_version_str,
IsSshProtocol() ? "true" : "false",
source_pgdata, dest_pgdata);
if (current.from_replica)
elog(INFO, "Running catchup from standby");
return source_conn;
}
/*
* Check that catchup can be performed on source and dest
* this function is for checks, that can be performed without modification of data on disk
*/
static void
catchup_preflight_checks(PGNodeInfo *source_node_info, PGconn *source_conn,
const char *source_pgdata, const char *dest_pgdata)
{
/* TODO
* gsmol - fallback to FULL mode if dest PGDATA is empty
* kulaginm -- I think this is a harmful feature. If user requested an incremental catchup, then
* he expects that this will be done quickly and efficiently. If, for example, he made a mistake
* with dest_dir, then he will receive a second full copy instead of an error message, and I think
* that in some cases he would prefer the error.
* I propose in future versions to offer a backup_mode auto, in which we will look to the dest_dir
* and decide which of the modes will be the most effective.
* I.e.:
* if(requested_backup_mode == BACKUP_MODE_DIFF_AUTO)
* {
* if(dest_pgdata_is_empty)
* backup_mode = BACKUP_MODE_FULL;
* else
* if(ptrack supported and applicable)
* backup_mode = BACKUP_MODE_DIFF_PTRACK;
* else
* backup_mode = BACKUP_MODE_DIFF_DELTA;
* }
*/
if (dir_is_empty(dest_pgdata, FIO_LOCAL_HOST))
{
if (current.backup_mode == BACKUP_MODE_DIFF_PTRACK ||
current.backup_mode == BACKUP_MODE_DIFF_DELTA)
elog(ERROR, "\"%s\" is empty, but incremental catchup mode requested.",
dest_pgdata);
}
else /* dest dir not empty */
{
if (current.backup_mode == BACKUP_MODE_FULL)
elog(ERROR, "Can't perform full catchup into non-empty directory \"%s\".",
dest_pgdata);
}
/* check that postmaster is not running in destination */
if (current.backup_mode != BACKUP_MODE_FULL)
{
pid_t pid;
pid = fio_check_postmaster(dest_pgdata, FIO_LOCAL_HOST);
if (pid == 1) /* postmaster.pid is mangled */
{
char pid_filename[MAXPGPATH];
join_path_components(pid_filename, dest_pgdata, "postmaster.pid");
elog(ERROR, "Pid file \"%s\" is mangled, cannot determine whether postmaster is running or not",
pid_filename);
}
else if (pid > 1) /* postmaster is up */
{
elog(ERROR, "Postmaster with pid %u is running in destination directory \"%s\"",
pid, dest_pgdata);
}
}
/* check backup_label absence in dest */
if (current.backup_mode != BACKUP_MODE_FULL)
{
char backup_label_filename[MAXPGPATH];
join_path_components(backup_label_filename, dest_pgdata, PG_BACKUP_LABEL_FILE);
if (fio_access(backup_label_filename, F_OK, FIO_LOCAL_HOST) == 0)
elog(ERROR, "Destination directory contains \"" PG_BACKUP_LABEL_FILE "\" file");
}
/* Check that connected PG instance, source and destination PGDATA are the same */
{
uint64 source_conn_id, source_id, dest_id;
source_conn_id = get_remote_system_identifier(source_conn);
source_id = get_system_identifier(source_pgdata, FIO_DB_HOST, false); /* same as instance_config.system_identifier */
if (source_conn_id != source_id)
elog(ERROR, "Database identifiers mismatch: we connected to DB id %lu, but in \"%s\" we found id %lu",
source_conn_id, source_pgdata, source_id);
if (current.backup_mode != BACKUP_MODE_FULL)
{
dest_id = get_system_identifier(dest_pgdata, FIO_LOCAL_HOST, false);
if (source_conn_id != dest_id)
elog(ERROR, "Database identifiers mismatch: we connected to DB id %lu, but in \"%s\" we found id %lu",
source_conn_id, dest_pgdata, dest_id);
}
}
/* check PTRACK version */
if (current.backup_mode == BACKUP_MODE_DIFF_PTRACK)
{
if (source_node_info->ptrack_version_num == 0)
elog(ERROR, "This PostgreSQL instance does not support ptrack");
else if (source_node_info->ptrack_version_num < 200)
elog(ERROR, "ptrack extension is too old.\n"
"Upgrade ptrack to version >= 2");
else if (!source_node_info->is_ptrack_enabled)
elog(ERROR, "Ptrack is disabled");
}
if (current.from_replica && exclusive_backup)
elog(ERROR, "Catchup from standby is only available for PostgreSQL >= 9.6");
/* check that we don't overwrite tablespace in source pgdata */
catchup_check_tablespaces_existance_in_tbsmapping(source_conn);
/* check timelines */
if (current.backup_mode != BACKUP_MODE_FULL)
{
RedoParams dest_redo = { 0, InvalidXLogRecPtr, 0 };
/* fill dest_redo.lsn and dest_redo.tli */
get_redo(dest_pgdata, FIO_LOCAL_HOST, &dest_redo);
if (current.tli != 1)
{
parray *source_timelines; /* parray* of TimeLineHistoryEntry* */
source_timelines = catchup_get_tli_history(&instance_config.conn_opt, current.tli);
if (source_timelines == NULL)
elog(ERROR, "Cannot get source timeline history");
if (!satisfy_timeline(source_timelines, dest_redo.tli, dest_redo.lsn))
elog(ERROR, "Destination is not in source timeline history");
parray_walk(source_timelines, pfree);
parray_free(source_timelines);
}
else /* special case -- no history files in source */
{
if (dest_redo.tli != 1)
elog(ERROR, "Source is behind destination in timeline history");
}
}
}
/*
* Check that all tablespaces exists in tablespace mapping (--tablespace-mapping option)
* Check that all local mapped directories is empty if it is local FULL catchup
* Emit fatal error if that (not existent in map or not empty) tablespace found
*/
static void
catchup_check_tablespaces_existance_in_tbsmapping(PGconn *conn)
{
PGresult *res;
int i;
char *tablespace_path = NULL;
const char *linked_path = NULL;
char *query = "SELECT pg_catalog.pg_tablespace_location(oid) "
"FROM pg_catalog.pg_tablespace "
"WHERE pg_catalog.pg_tablespace_location(oid) <> '';";
res = pgut_execute(conn, query, 0, NULL);
if (!res)
elog(ERROR, "Failed to get list of tablespaces");
for (i = 0; i < res->ntups; i++)
{
tablespace_path = PQgetvalue(res, i, 0);
Assert (strlen(tablespace_path) > 0);
canonicalize_path(tablespace_path);
linked_path = get_tablespace_mapping(tablespace_path);
if (strcmp(tablespace_path, linked_path) == 0)
/* same result -> not found in mapping */
{
if (!fio_is_remote(FIO_DB_HOST))
elog(ERROR, "Local catchup executed, but source database contains "
"tablespace (\"%s\"), that is not listed in the map", tablespace_path);
else
elog(WARNING, "Remote catchup executed and source database contains "
"tablespace (\"%s\"), that is not listed in the map", tablespace_path);
}
if (!is_absolute_path(linked_path))
elog(ERROR, "Tablespace directory path must be an absolute path: \"%s\"",
linked_path);
if (current.backup_mode == BACKUP_MODE_FULL
&& !dir_is_empty(linked_path, FIO_LOCAL_HOST))
elog(ERROR, "Target mapped tablespace directory (\"%s\") is not empty in FULL catchup",
linked_path);
}
PQclear(res);
}
/*
* Get timeline history via replication connection
* returns parray* of TimeLineHistoryEntry*
*/
static parray*
catchup_get_tli_history(ConnectionOptions *conn_opt, TimeLineID tli)
{
PGresult *res;
PGconn *conn;
char *history;
char query[128];
parray *result = NULL;
snprintf(query, sizeof(query), "TIMELINE_HISTORY %u", tli);
/*
* Connect in replication mode to the server.
*/
conn = pgut_connect_replication(conn_opt->pghost,
conn_opt->pgport,
conn_opt->pgdatabase,
conn_opt->pguser,
false);
if (!conn)
return NULL;
res = PQexec(conn, query);
PQfinish(conn);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
elog(WARNING, "Could not send replication command \"%s\": %s",
query, PQresultErrorMessage(res));
PQclear(res);
return NULL;
}
/*
* The response to TIMELINE_HISTORY is a single row result set
* with two fields: filename and content
*/
if (PQnfields(res) != 2 || PQntuples(res) != 1)
{
elog(ERROR, "Unexpected response to TIMELINE_HISTORY command: "
"got %d rows and %d fields, expected %d rows and %d fields",
PQntuples(res), PQnfields(res), 1, 2);
PQclear(res);
return NULL;
}
history = pgut_strdup(PQgetvalue(res, 0, 1));
result = parse_tli_history_buffer(history, tli);
/* some cleanup */
pg_free(history);
PQclear(res);
return result;
}
/*
* catchup multithreaded copy rountine and helper structure and function
*/
/* parameters for catchup_thread_runner() passed from catchup_multithreaded_copy() */
typedef struct
{
PGNodeInfo *nodeInfo;
const char *from_root;
const char *to_root;
parray *source_filelist;
parray *dest_filelist;
XLogRecPtr sync_lsn;
BackupMode backup_mode;
int thread_num;
size_t transfered_bytes;
bool completed;
} catchup_thread_runner_arg;
/* Catchup file copier executed in separate thread */
static void *
catchup_thread_runner(void *arg)
{
int i;
char from_fullpath[MAXPGPATH];
char to_fullpath[MAXPGPATH];
catchup_thread_runner_arg *arguments = (catchup_thread_runner_arg *) arg;
int n_files = parray_num(arguments->source_filelist);
/* catchup a file */
for (i = 0; i < n_files; i++)
{
pgFile *file = (pgFile *) parray_get(arguments->source_filelist, i);
pgFile *dest_file = NULL;
/* We have already copied all directories */
if (S_ISDIR(file->mode))
continue;
if (file->excluded)
continue;
if (!pg_atomic_test_set_flag(&file->lock))
continue;
/* check for interrupt */
if (interrupted || thread_interrupted)
elog(ERROR, "Interrupted during catchup");
if (progress)
elog(INFO, "Progress: (%d/%d). Process file \"%s\"",
i + 1, n_files, file->rel_path);
/* construct destination filepath */
Assert(file->external_dir_num == 0);
join_path_components(from_fullpath, arguments->from_root, file->rel_path);
join_path_components(to_fullpath, arguments->to_root, file->rel_path);
/* Encountered some strange beast */
if (!S_ISREG(file->mode))
elog(WARNING, "Unexpected type %d of file \"%s\", skipping",
file->mode, from_fullpath);
/* Check that file exist in dest pgdata */
if (arguments->backup_mode != BACKUP_MODE_FULL)
{
pgFile **dest_file_tmp = NULL;
dest_file_tmp = (pgFile **) parray_bsearch(arguments->dest_filelist,
file, pgFileCompareRelPathWithExternal);
if (dest_file_tmp)
{
/* File exists in destination PGDATA */
file->exists_in_prev = true;
dest_file = *dest_file_tmp;
}
}
/* Do actual work */
if (file->is_datafile && !file->is_cfs)
{
catchup_data_file(file, from_fullpath, to_fullpath,
arguments->sync_lsn,
arguments->backup_mode,
arguments->nodeInfo->checksum_version,
dest_file != NULL ? dest_file->size : 0);
}
else
{
backup_non_data_file(file, dest_file, from_fullpath, to_fullpath,
arguments->backup_mode, current.parent_backup, true);
}
/* file went missing during catchup */
if (file->write_size == FILE_NOT_FOUND)
continue;
if (file->write_size == BYTES_INVALID)
{
elog(VERBOSE, "Skipping the unchanged file: \"%s\", read %li bytes", from_fullpath, file->read_size);
continue;
}
arguments->transfered_bytes += file->write_size;
elog(VERBOSE, "File \"%s\". Copied "INT64_FORMAT " bytes",
from_fullpath, file->write_size);
}
/* ssh connection to longer needed */
fio_disconnect();
/* Data files transferring is successful */
arguments->completed = true;
return NULL;
}
/*
* main multithreaded copier
* returns size of transfered data file
* or -1 in case of error
*/
static ssize_t
catchup_multithreaded_copy(int num_threads,
PGNodeInfo *source_node_info,
const char *source_pgdata_path,
const char *dest_pgdata_path,
parray *source_filelist,
parray *dest_filelist,
XLogRecPtr sync_lsn,
BackupMode backup_mode)
{
/* arrays with meta info for multi threaded catchup */
catchup_thread_runner_arg *threads_args;
pthread_t *threads;
bool all_threads_successful = true;
ssize_t transfered_bytes_result = 0;
int i;
/* init thread args */
threads_args = (catchup_thread_runner_arg *) palloc(sizeof(catchup_thread_runner_arg) * num_threads);
for (i = 0; i < num_threads; i++)
threads_args[i] = (catchup_thread_runner_arg){
.nodeInfo = source_node_info,
.from_root = source_pgdata_path,
.to_root = dest_pgdata_path,
.source_filelist = source_filelist,
.dest_filelist = dest_filelist,
.sync_lsn = sync_lsn,
.backup_mode = backup_mode,
.thread_num = i + 1,
.transfered_bytes = 0,
.completed = false,
};
/* Run threads */
thread_interrupted = false;
threads = (pthread_t *) palloc(sizeof(pthread_t) * num_threads);
for (i = 0; i < num_threads; i++)
{
elog(VERBOSE, "Start thread num: %i", i);
pthread_create(&threads[i], NULL, &catchup_thread_runner, &(threads_args[i]));
}
/* Wait threads */
for (i = 0; i < num_threads; i++)
{
pthread_join(threads[i], NULL);
all_threads_successful &= threads_args[i].completed;
transfered_bytes_result += threads_args[i].transfered_bytes;
}
free(threads);
free(threads_args);
return all_threads_successful ? transfered_bytes_result : -1;
}
/*
* Sync every file in destination directory to disk
*/
static void
catchup_sync_destination_files(const char* pgdata_path, fio_location location, parray *filelist, pgFile *pg_control_file)
{
char fullpath[MAXPGPATH];
time_t start_time, end_time;
char pretty_time[20];
int i;
elog(INFO, "Syncing copied files to disk");
time(&start_time);
for (i = 0; i < parray_num(filelist); i++)
{
pgFile *file = (pgFile *) parray_get(filelist, i);
/* TODO: sync directory ?
* - at first glance we can rely on fs journaling,
* which is enabled by default on most platforms
* - but PG itself is not relying on fs, its durable_sync
* includes directory sync
*/
if (S_ISDIR(file->mode) || file->excluded)
continue;
Assert(file->external_dir_num == 0);
join_path_components(fullpath, pgdata_path, file->rel_path);
if (fio_sync(fullpath, location) != 0)
elog(ERROR, "Cannot sync file \"%s\": %s", fullpath, strerror(errno));
}
/*
* sync pg_control file
*/
join_path_components(fullpath, pgdata_path, pg_control_file->rel_path);
if (fio_sync(fullpath, location) != 0)
elog(ERROR, "Cannot sync file \"%s\": %s", fullpath, strerror(errno));
time(&end_time);
pretty_time_interval(difftime(end_time, start_time),
pretty_time, lengthof(pretty_time));
elog(INFO, "Files are synced, time elapsed: %s", pretty_time);
}
/*
* Filter filelist helper function (used to process --exclude-path's)
* filelist -- parray of pgFile *, can't be NULL
* exclude_absolute_paths_list -- sorted parray of char * (absolute paths, starting with '/'), can be NULL
* exclude_relative_paths_list -- sorted parray of char * (relative paths), can be NULL
* logging_string -- helper parameter, used for generating verbose log messages ("Source" or "Destination")
*/
static void
filter_filelist(parray *filelist, const char *pgdata,
parray *exclude_absolute_paths_list, parray *exclude_relative_paths_list,
const char *logging_string)
{
int i;
if (exclude_absolute_paths_list == NULL && exclude_relative_paths_list == NULL)
return;
for (i = 0; i < parray_num(filelist); ++i)
{
char full_path[MAXPGPATH];
pgFile *file = (pgFile *) parray_get(filelist, i);
join_path_components(full_path, pgdata, file->rel_path);
if (
(exclude_absolute_paths_list != NULL
&& parray_bsearch(exclude_absolute_paths_list, full_path, pgPrefixCompareString)!= NULL
) || (
exclude_relative_paths_list != NULL
&& parray_bsearch(exclude_relative_paths_list, file->rel_path, pgPrefixCompareString)!= NULL)
)
{
elog(LOG, "%s file \"%s\" excluded with --exclude-path option", logging_string, full_path);
file->excluded = true;
}
}
}
/*
* Entry point of pg_probackup CATCHUP subcommand.
* exclude_*_paths_list are parray's of char *
*/
int
do_catchup(const char *source_pgdata, const char *dest_pgdata, int num_threads, bool sync_dest_files,
parray *exclude_absolute_paths_list, parray *exclude_relative_paths_list)
{
PGconn *source_conn = NULL;
PGNodeInfo source_node_info;
bool backup_logs = false;
parray *source_filelist = NULL;
pgFile *source_pg_control_file = NULL;
parray *dest_filelist = NULL;
char dest_xlog_path[MAXPGPATH];
RedoParams dest_redo = { 0, InvalidXLogRecPtr, 0 };
PGStopBackupResult stop_backup_result;
bool catchup_isok = true;
int i;
/* for fancy reporting */
time_t start_time, end_time;
ssize_t transfered_datafiles_bytes = 0;
ssize_t transfered_walfiles_bytes = 0;
char pretty_source_bytes[20];
source_conn = catchup_init_state(&source_node_info, source_pgdata, dest_pgdata);
catchup_preflight_checks(&source_node_info, source_conn, source_pgdata, dest_pgdata);
/* we need to sort --exclude_path's for future searching */
if (exclude_absolute_paths_list != NULL)
parray_qsort(exclude_absolute_paths_list, pgCompareString);
if (exclude_relative_paths_list != NULL)
parray_qsort(exclude_relative_paths_list, pgCompareString);
elog(LOG, "Database catchup start");
if (current.backup_mode != BACKUP_MODE_FULL)
{
dest_filelist = parray_new();
dir_list_file(dest_filelist, dest_pgdata,
true, true, false, backup_logs, true, 0, FIO_LOCAL_HOST);
filter_filelist(dest_filelist, dest_pgdata, exclude_absolute_paths_list, exclude_relative_paths_list, "Destination");
// fill dest_redo.lsn and dest_redo.tli
get_redo(dest_pgdata, FIO_LOCAL_HOST, &dest_redo);
elog(INFO, "syncLSN = %X/%X", (uint32) (dest_redo.lsn >> 32), (uint32) dest_redo.lsn);
/*
* Future improvement to catch partial catchup:
* 1. rename dest pg_control into something like pg_control.pbk
* (so user can't start partial catchup'ed instance from this point)
* 2. try to read by get_redo() pg_control and pg_control.pbk (to detect partial catchup)
* 3. at the end (after copy of correct pg_control), remove pg_control.pbk
*/
}
/*
* Make sure that sync point is withing ptrack tracking range
* TODO: move to separate function to use in both backup.c and catchup.c
*/
if (current.backup_mode == BACKUP_MODE_DIFF_PTRACK)
{
XLogRecPtr ptrack_lsn = get_last_ptrack_lsn(source_conn, &source_node_info);
if (ptrack_lsn > dest_redo.lsn || ptrack_lsn == InvalidXLogRecPtr)
elog(ERROR, "LSN from ptrack_control in source %X/%X is greater than checkpoint LSN in destination %X/%X.\n"
"You can perform only FULL catchup.",
(uint32) (ptrack_lsn >> 32), (uint32) (ptrack_lsn),
(uint32) (dest_redo.lsn >> 32),
(uint32) (dest_redo.lsn));
}
{
char label[1024];
/* notify start of backup to PostgreSQL server */
time2iso(label, lengthof(label), current.start_time, false);
strncat(label, " with pg_probackup", lengthof(label) -
strlen(" with pg_probackup"));
/* Call pg_start_backup function in PostgreSQL connect */
pg_start_backup(label, smooth_checkpoint, ¤t, &source_node_info, source_conn);
elog(LOG, "pg_start_backup START LSN %X/%X", (uint32) (current.start_lsn >> 32), (uint32) (current.start_lsn));
}
/* Sanity: source cluster must be "in future" relatively to dest cluster */
if (current.backup_mode != BACKUP_MODE_FULL &&
dest_redo.lsn > current.start_lsn)
elog(ERROR, "Current START LSN %X/%X is lower than SYNC LSN %X/%X, "
"it may indicate that we are trying to catchup with PostgreSQL instance from the past",
(uint32) (current.start_lsn >> 32), (uint32) (current.start_lsn),
(uint32) (dest_redo.lsn >> 32), (uint32) (dest_redo.lsn));
/* Start stream replication */
join_path_components(dest_xlog_path, dest_pgdata, PG_XLOG_DIR);
fio_mkdir(dest_xlog_path, DIR_PERMISSION, FIO_LOCAL_HOST);
start_WAL_streaming(source_conn, dest_xlog_path, &instance_config.conn_opt,
current.start_lsn, current.tli, false);
source_filelist = parray_new();
/* list files with the logical path. omit $PGDATA */
if (fio_is_remote(FIO_DB_HOST))
fio_list_dir(source_filelist, source_pgdata,
true, true, false, backup_logs, true, 0);
else
dir_list_file(source_filelist, source_pgdata,
true, true, false, backup_logs, true, 0, FIO_LOCAL_HOST);
//REVIEW FIXME. Let's fix that before release.
// TODO what if wal is not a dir (symlink to a dir)?
// - Currently backup/restore transform pg_wal symlink to directory
// so the problem is not only with catchup.
// if we want to make it right - we must provide the way
// for symlink remapping during restore and catchup.
// By default everything must be left as it is.
/* close ssh session in main thread */
fio_disconnect();
/*
* Sort pathname ascending. It is necessary to create intermediate
* directories sequentially.
*
* For example:
* 1 - create 'base'
* 2 - create 'base/1'
*
* Sorted array is used at least in parse_filelist_filenames(),
* extractPageMap(), make_pagemap_from_ptrack().
*/
parray_qsort(source_filelist, pgFileCompareRelPathWithExternal);
//REVIEW Do we want to do similar calculation for dest?
//REVIEW_ANSWER what for?
{
ssize_t source_bytes = 0;
char pretty_bytes[20];
source_bytes += calculate_datasize_of_filelist(source_filelist);
/* Extract information about files in source_filelist parsing their names:*/
parse_filelist_filenames(source_filelist, source_pgdata);
filter_filelist(source_filelist, source_pgdata, exclude_absolute_paths_list, exclude_relative_paths_list, "Source");
current.pgdata_bytes += calculate_datasize_of_filelist(source_filelist);
pretty_size(current.pgdata_bytes, pretty_source_bytes, lengthof(pretty_source_bytes));
pretty_size(source_bytes - current.pgdata_bytes, pretty_bytes, lengthof(pretty_bytes));
elog(INFO, "Source PGDATA size: %s (excluded %s)", pretty_source_bytes, pretty_bytes);
}
elog(LOG, "Start LSN (source): %X/%X, TLI: %X",
(uint32) (current.start_lsn >> 32), (uint32) (current.start_lsn),
current.tli);
if (current.backup_mode != BACKUP_MODE_FULL)
elog(LOG, "LSN in destination: %X/%X, TLI: %X",
(uint32) (dest_redo.lsn >> 32), (uint32) (dest_redo.lsn),
dest_redo.tli);
/* Build page mapping in PTRACK mode */
if (current.backup_mode == BACKUP_MODE_DIFF_PTRACK)
{
time(&start_time);
elog(INFO, "Extracting pagemap of changed blocks");
/* Build the page map from ptrack information */
make_pagemap_from_ptrack_2(source_filelist, source_conn,
source_node_info.ptrack_schema,
source_node_info.ptrack_version_num,
dest_redo.lsn);
time(&end_time);
elog(INFO, "Pagemap successfully extracted, time elapsed: %.0f sec",
difftime(end_time, start_time));
}
/*
* Make directories before catchup
*/
/*
* We iterate over source_filelist and for every directory with parent 'pg_tblspc'
* we must lookup this directory name in tablespace map.
* If we got a match, we treat this directory as tablespace.
* It means that we create directory specified in tablespace map and
* original directory created as symlink to it.
*/
for (i = 0; i < parray_num(source_filelist); i++)
{
pgFile *file = (pgFile *) parray_get(source_filelist, i);
char parent_dir[MAXPGPATH];
if (!S_ISDIR(file->mode) || file->excluded)
continue;
/*
* check if it is fake "directory" and is a tablespace link
* this is because we passed the follow_symlink when building the list
*/
/* get parent dir of rel_path */
strncpy(parent_dir, file->rel_path, MAXPGPATH);
get_parent_directory(parent_dir);
/* check if directory is actually link to tablespace */
if (strcmp(parent_dir, PG_TBLSPC_DIR) != 0)
{
/* if the entry is a regular directory, create it in the destination */
char dirpath[MAXPGPATH];
join_path_components(dirpath, dest_pgdata, file->rel_path);
elog(VERBOSE, "Create directory '%s'", dirpath);
fio_mkdir(dirpath, DIR_PERMISSION, FIO_LOCAL_HOST);
}
else
{
/* this directory located in pg_tblspc */
const char *linked_path = NULL;
char to_path[MAXPGPATH];
// TODO perform additional check that this is actually symlink?
{ /* get full symlink path and map this path to new location */
char source_full_path[MAXPGPATH];
char symlink_content[MAXPGPATH];
join_path_components(source_full_path, source_pgdata, file->rel_path);
fio_readlink(source_full_path, symlink_content, sizeof(symlink_content), FIO_DB_HOST);
/* we checked that mapping exists in preflight_checks for local catchup */
linked_path = get_tablespace_mapping(symlink_content);
elog(INFO, "Map tablespace full_path: \"%s\" old_symlink_content: \"%s\" new_symlink_content: \"%s\"\n",
source_full_path,
symlink_content,
linked_path);
}
if (!is_absolute_path(linked_path))
elog(ERROR, "Tablespace directory path must be an absolute path: %s\n",
linked_path);
join_path_components(to_path, dest_pgdata, file->rel_path);
elog(VERBOSE, "Create directory \"%s\" and symbolic link \"%s\"",
linked_path, to_path);
/* create tablespace directory */
if (fio_mkdir(linked_path, file->mode, FIO_LOCAL_HOST) != 0)
elog(ERROR, "Could not create tablespace directory \"%s\": %s",
linked_path, strerror(errno));
/* create link to linked_path */
if (fio_symlink(linked_path, to_path, true, FIO_LOCAL_HOST) < 0)
elog(ERROR, "Could not create symbolic link \"%s\" -> \"%s\": %s",
linked_path, to_path, strerror(errno));
}
}
/*
* find pg_control file (in already sorted source_filelist)
* and exclude it from list for future special processing
*/
{
int control_file_elem_index;
pgFile search_key;
MemSet(&search_key, 0, sizeof(pgFile));
/* pgFileCompareRelPathWithExternal uses only .rel_path and .external_dir_num for comparision */
search_key.rel_path = XLOG_CONTROL_FILE;
search_key.external_dir_num = 0;
control_file_elem_index = parray_bsearch_index(source_filelist, &search_key, pgFileCompareRelPathWithExternal);
if(control_file_elem_index < 0)
elog(ERROR, "\"%s\" not found in \"%s\"\n", XLOG_CONTROL_FILE, source_pgdata);
source_pg_control_file = parray_remove(source_filelist, control_file_elem_index);
}
/* TODO before public release: must be more careful with pg_control.
* when running catchup or incremental restore
* cluster is actually in two states
* simultaneously - old and new, so
* it must contain both pg_control files
* describing those states: global/pg_control_old, global/pg_control_new
* 1. This approach will provide us with means of
* robust detection of previos failures and thus correct operation retrying (or forbidding).
* 2. We will have the ability of preventing instance from starting
* in the middle of our operations.
*/
/*
* remove absent source files in dest (dropped tables, etc...)
* note: global/pg_control will also be deleted here
* mark dest files (that excluded with source --exclude-path) also for exclusion
*/
if (current.backup_mode != BACKUP_MODE_FULL)
{
elog(INFO, "Removing redundant files in destination directory");
parray_qsort(dest_filelist, pgFileCompareRelPathWithExternalDesc);
for (i = 0; i < parray_num(dest_filelist); i++)
{
bool redundant = true;
pgFile *file = (pgFile *) parray_get(dest_filelist, i);
pgFile **src_file = NULL;
//TODO optimize it and use some merge-like algorithm
//instead of bsearch for each file.
src_file = (pgFile **) parray_bsearch(source_filelist, file, pgFileCompareRelPathWithExternal);
if (src_file!= NULL && !(*src_file)->excluded && file->excluded)
(*src_file)->excluded = true;
if (src_file!= NULL || file->excluded)
redundant = false;
/* pg_filenode.map are always copied, because it's crc cannot be trusted */
Assert(file->external_dir_num == 0);
if (pg_strcasecmp(file->name, RELMAPPER_FILENAME) == 0)
redundant = true;
/* if file does not exists in destination list, then we can safely unlink it */
if (redundant)
{
char fullpath[MAXPGPATH];
join_path_components(fullpath, dest_pgdata, file->rel_path);
fio_delete(file->mode, fullpath, FIO_DB_HOST);
elog(VERBOSE, "Deleted file \"%s\"", fullpath);
/* shrink dest pgdata list */
pgFileFree(file);
parray_remove(dest_filelist, i);
i--;
}
}
}
/* clear file locks */
pfilearray_clear_locks(source_filelist);
/* Sort by size for load balancing */
parray_qsort(source_filelist, pgFileCompareSizeDesc);
/* Sort the array for binary search */
if (dest_filelist)
parray_qsort(dest_filelist, pgFileCompareRelPathWithExternal);
/* run copy threads */
elog(INFO, "Start transferring data files");
time(&start_time);
transfered_datafiles_bytes = catchup_multithreaded_copy(num_threads, &source_node_info,
source_pgdata, dest_pgdata,
source_filelist, dest_filelist,
dest_redo.lsn, current.backup_mode);
catchup_isok = transfered_datafiles_bytes != -1;
/* at last copy control file */
if (catchup_isok)
{
char from_fullpath[MAXPGPATH];
char to_fullpath[MAXPGPATH];
join_path_components(from_fullpath, source_pgdata, source_pg_control_file->rel_path);
join_path_components(to_fullpath, dest_pgdata, source_pg_control_file->rel_path);
copy_pgcontrol_file(from_fullpath, FIO_DB_HOST,
to_fullpath, FIO_LOCAL_HOST, source_pg_control_file);
transfered_datafiles_bytes += source_pg_control_file->size;
}
if (!catchup_isok)
{
char pretty_time[20];
char pretty_transfered_data_bytes[20];
time(&end_time);
pretty_time_interval(difftime(end_time, start_time),
pretty_time, lengthof(pretty_time));
pretty_size(transfered_datafiles_bytes, pretty_transfered_data_bytes, lengthof(pretty_transfered_data_bytes));
elog(ERROR, "Catchup failed. Transfered: %s, time elapsed: %s",
pretty_transfered_data_bytes, pretty_time);
}
/* Notify end of backup */
{
//REVIEW Is it relevant to catchup? I suppose it isn't, since catchup is a new code.
//If we do need it, please write a comment explaining that.
/* kludge against some old bug in archive_timeout. TODO: remove in 3.0.0 */
int timeout = (instance_config.archive_timeout > 0) ?
instance_config.archive_timeout : ARCHIVE_TIMEOUT_DEFAULT;
char *stop_backup_query_text = NULL;
pg_silent_client_messages(source_conn);
/* Execute pg_stop_backup using PostgreSQL connection */
pg_stop_backup_send(source_conn, source_node_info.server_version, current.from_replica, exclusive_backup, &stop_backup_query_text);
/*
* Wait for the result of pg_stop_backup(), but no longer than
* archive_timeout seconds
*/
pg_stop_backup_consume(source_conn, source_node_info.server_version, exclusive_backup, timeout, stop_backup_query_text, &stop_backup_result);
/* Cleanup */