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switchover: check for pending archive files on the demotion candidate

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If the current primary (demotion candidate) still has any files to archive,
it will delay the shutdown until all files are archived. If there is a
substantial number of files, and/or the archive command executes slowly,
this will probably lead to an unwelcome delay in the switchover process.
This commit is contained in:
Ian Barwick
2017-08-08 00:37:20 +09:00
parent 068ecc963d
commit 2499b42ef8
12 changed files with 543 additions and 67 deletions
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83
dbutils.c
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@@ -8,6 +8,8 @@
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <dirent.h>
#include "repmgr.h"
#include "dbutils.h"
@@ -1293,6 +1295,87 @@ can_use_pg_rewind(PGconn *conn, const char *data_directory, PQExpBufferData *rea
}
int
get_ready_archive_files(PGconn *conn, const char *data_directory)
{
char archive_status_dir[MAXPGPATH] = "";
struct stat statbuf;
struct dirent *arcdir_ent;
DIR *arcdir;
int ready_count = 0;
if (server_version_num == UNKNOWN_SERVER_VERSION_NUM)
server_version_num = get_server_version(conn, NULL);
if (server_version_num >= 1000000)
{
snprintf(archive_status_dir, MAXPGPATH,
"%s/pg_wal/archive_status",
data_directory);
}
else
{
snprintf(archive_status_dir, MAXPGPATH,
"%s/pg_xlog/archive_status",
data_directory);
}
/* sanity-check directory path */
if (stat(archive_status_dir, &statbuf) == -1)
{
log_error(_("unable to access archive_status directory \"%s\""),
archive_status_dir);
log_detail("%s", strerror(errno));
/* XXX magic number*/
return -1;
}
arcdir = opendir(archive_status_dir);
if (arcdir == NULL)
{
log_error(_("unable to open archive directory \"%s\""),
archive_status_dir);
log_detail("%s", strerror(errno));
/* XXX magic number*/
return -1;
}
while ((arcdir_ent = readdir(arcdir)) != NULL)
{
struct stat statbuf;
char file_path[MAXPGPATH] = "";
int basenamelen;
snprintf(file_path, MAXPGPATH,
"%s/%s",
archive_status_dir,
arcdir_ent->d_name);
/* skip non-files */
if (stat(file_path, &statbuf) == 0 && !S_ISREG(statbuf.st_mode))
{
continue;
}
basenamelen = (int) strlen(arcdir_ent->d_name) - 6;
/*
* count anything ending in ".ready"; for a more precise implementation
* see: src/backend/postmaster/pgarch.c
*/
if (strcmp(arcdir_ent->d_name + basenamelen, ".ready") == 0)
ready_count ++;
}
closedir(arcdir);
return ready_count;
}
/* ================ */
/* result functions */
/* ================ */