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Further improvements in pg_ctl's new wait-for-postmaster-start logic.
Add a postmaster_is_alive() test to the wait loop, so that we stop waiting if the postmaster dies without removing its pidfile. Unfortunately this only helps after the postmaster has created its pidfile, since until then we don't know which PID to check. But if it never does create the pidfile, we can give up in a relatively short time, so this is a useful addition in practice. Per suggestion from Fujii Masao, though this doesn't look very much like his patch. In addition, improve pg_ctl's ability to cope with pre-existing pidfiles. Such a file might or might not represent a live postmaster that is going to block our postmaster from starting, but the previous code pre-judged the situation and gave up waiting immediately. Now, we will wait for up to 5 seconds to see if our postmaster overwrites such a file. This issue interacts with Fujii's patch because we would make the wrong conclusion if we did the postmaster_is_alive() test with a pre-existing PID. All of this could be improved if we rewrote start_postmaster() so that it could report the child postmaster's PID, so that we'd know a-priori the correct PID to test with postmaster_is_alive(). That looks like a bit too much change for so late in the 9.1 development cycle, unfortunately.
This commit is contained in:
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6923d699bc
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@ -366,6 +366,10 @@ start_postmaster(void)
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/*
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/*
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* Since there might be quotes to handle here, it is easier simply to pass
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* Since there might be quotes to handle here, it is easier simply to pass
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* everything to a shell to process them.
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* everything to a shell to process them.
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*
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* XXX it would be better to fork and exec so that we would know the
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* child postmaster's PID directly; then test_postmaster_connection could
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* use the PID without having to rely on reading it back from the pidfile.
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*/
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*/
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if (log_file != NULL)
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if (log_file != NULL)
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snprintf(cmd, MAXPGPATH, SYSTEMQUOTE "\"%s\" %s%s < \"%s\" >> \"%s\" 2>&1 &" SYSTEMQUOTE,
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snprintf(cmd, MAXPGPATH, SYSTEMQUOTE "\"%s\" %s%s < \"%s\" >> \"%s\" 2>&1 &" SYSTEMQUOTE,
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@ -412,6 +416,8 @@ static PGPing
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test_postmaster_connection(bool do_checkpoint)
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test_postmaster_connection(bool do_checkpoint)
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{
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{
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PGPing ret = PQPING_NO_RESPONSE;
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PGPing ret = PQPING_NO_RESPONSE;
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bool found_stale_pidfile = false;
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pgpid_t pm_pid = 0;
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char connstr[MAXPGPATH * 2 + 256];
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char connstr[MAXPGPATH * 2 + 256];
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int i;
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int i;
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@ -458,7 +464,7 @@ test_postmaster_connection(bool do_checkpoint)
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if (optlines[3] == NULL)
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if (optlines[3] == NULL)
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{
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{
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/* File is exactly three lines, must be pre-9.1 */
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/* File is exactly three lines, must be pre-9.1 */
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write_stderr(_("%s: -w option is not supported when starting a pre-9.1 server\n"),
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write_stderr(_("\n%s: -w option is not supported when starting a pre-9.1 server\n"),
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progname);
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progname);
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return PQPING_NO_ATTEMPT;
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return PQPING_NO_ATTEMPT;
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}
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}
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@ -466,70 +472,86 @@ test_postmaster_connection(bool do_checkpoint)
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optlines[5] != NULL)
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optlines[5] != NULL)
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{
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{
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/* File is complete enough for us, parse it */
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/* File is complete enough for us, parse it */
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long pmpid;
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time_t pmstart;
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time_t pmstart;
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int portnum;
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char *sockdir;
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char *hostaddr;
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char host_str[MAXPGPATH];
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/*
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/*
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* Easy cross-check that we are looking at the right data
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* Make sanity checks. If it's for a standalone backend
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* directory: is the postmaster older than this execution
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* (negative PID), or the recorded start time is before
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* of pg_ctl? Subtract 2 seconds to allow for possible
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* pg_ctl started, then either we are looking at the wrong
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* clock skew between pg_ctl and the postmaster.
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* data directory, or this is a pre-existing pidfile that
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* hasn't (yet?) been overwritten by our child postmaster.
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* Allow 2 seconds slop for possible cross-process clock
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* skew.
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*/
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*/
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pmpid = atol(optlines[LOCK_FILE_LINE_PID - 1]);
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pmstart = atol(optlines[LOCK_FILE_LINE_START_TIME - 1]);
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pmstart = atol(optlines[LOCK_FILE_LINE_START_TIME - 1]);
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if (pmstart < start_time - 2)
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if (pmpid <= 0 || pmstart < start_time - 2)
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{
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{
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write_stderr(_("%s: this data directory is running a pre-existing postmaster\n"),
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/*
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progname);
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* Set flag to report stale pidfile if it doesn't
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return PQPING_NO_ATTEMPT;
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* get overwritten before we give up waiting.
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*/
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found_stale_pidfile = true;
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}
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}
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/*
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* OK, extract port number and host string to use. Prefer
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* using Unix socket if available.
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*/
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portnum = atoi(optlines[LOCK_FILE_LINE_PORT - 1]);
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sockdir = optlines[LOCK_FILE_LINE_SOCKET_DIR - 1];
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hostaddr = optlines[LOCK_FILE_LINE_LISTEN_ADDR - 1];
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/*
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* While unix_socket_directory can accept relative
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* directories, libpq's host parameter must have a leading
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* slash to indicate a socket directory. So, ignore
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* sockdir if it's relative, and try to use TCP instead.
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*/
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if (sockdir[0] == '/')
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strlcpy(host_str, sockdir, sizeof(host_str));
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else
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else
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strlcpy(host_str, hostaddr, sizeof(host_str));
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/* remove trailing newline */
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if (strchr(host_str, '\n') != NULL)
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*strchr(host_str, '\n') = '\0';
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/* Fail if we couldn't get either sockdir or host addr */
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if (host_str[0] == '\0')
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{
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{
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write_stderr(_("%s: -w option cannot use a relative socket directory specification\n"),
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/*
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progname);
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* OK, seems to be a valid pidfile from our child.
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return PQPING_NO_ATTEMPT;
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*/
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int portnum;
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char *sockdir;
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char *hostaddr;
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char host_str[MAXPGPATH];
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found_stale_pidfile = false;
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pm_pid = (pgpid_t) pmpid;
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/*
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* Extract port number and host string to use. Prefer
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* using Unix socket if available.
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*/
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portnum = atoi(optlines[LOCK_FILE_LINE_PORT - 1]);
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sockdir = optlines[LOCK_FILE_LINE_SOCKET_DIR - 1];
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hostaddr = optlines[LOCK_FILE_LINE_LISTEN_ADDR - 1];
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/*
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* While unix_socket_directory can accept relative
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* directories, libpq's host parameter must have a
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* leading slash to indicate a socket directory. So,
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* ignore sockdir if it's relative, and try to use TCP
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* instead.
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*/
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if (sockdir[0] == '/')
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strlcpy(host_str, sockdir, sizeof(host_str));
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else
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strlcpy(host_str, hostaddr, sizeof(host_str));
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/* remove trailing newline */
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if (strchr(host_str, '\n') != NULL)
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*strchr(host_str, '\n') = '\0';
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/* Fail if couldn't get either sockdir or host addr */
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if (host_str[0] == '\0')
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{
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write_stderr(_("\n%s: -w option cannot use a relative socket directory specification\n"),
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progname);
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return PQPING_NO_ATTEMPT;
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}
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/* If postmaster is listening on "*", use localhost */
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if (strcmp(host_str, "*") == 0)
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strcpy(host_str, "localhost");
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/*
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* We need to set connect_timeout otherwise on Windows
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* the Service Control Manager (SCM) will probably
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* timeout first.
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*/
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snprintf(connstr, sizeof(connstr),
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"dbname=postgres port=%d host='%s' connect_timeout=5",
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portnum, host_str);
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}
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}
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/* If postmaster is listening on "*", use "localhost" */
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if (strcmp(host_str, "*") == 0)
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strcpy(host_str, "localhost");
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/*
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* We need to set connect_timeout otherwise on Windows the
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* Service Control Manager (SCM) will probably timeout
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* first.
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*/
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snprintf(connstr, sizeof(connstr),
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"dbname=postgres port=%d host='%s' connect_timeout=5",
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portnum, host_str);
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}
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}
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}
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}
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}
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}
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@ -545,7 +567,11 @@ test_postmaster_connection(bool do_checkpoint)
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/*
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/*
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* The postmaster should create postmaster.pid very soon after being
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* The postmaster should create postmaster.pid very soon after being
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* started. If it's not there after we've waited 5 or more seconds,
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* started. If it's not there after we've waited 5 or more seconds,
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* assume startup failed and give up waiting.
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* assume startup failed and give up waiting. (Note this covers
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* both cases where the pidfile was never created, and where it was
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* created and then removed during postmaster exit.) Also, if there
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* *is* a file there but it appears stale, issue a suitable warning
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* and give up waiting.
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*/
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*/
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if (i >= 5)
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if (i >= 5)
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{
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{
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@ -553,8 +579,24 @@ test_postmaster_connection(bool do_checkpoint)
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if (stat(pid_file, &statbuf) != 0)
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if (stat(pid_file, &statbuf) != 0)
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return PQPING_NO_RESPONSE;
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return PQPING_NO_RESPONSE;
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if (found_stale_pidfile)
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{
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write_stderr(_("\n%s: this data directory appears to be running a pre-existing postmaster\n"),
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progname);
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return PQPING_NO_RESPONSE;
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}
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}
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}
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/*
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* If we've been able to identify the child postmaster's PID, check
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* the process is still alive. This covers cases where the postmaster
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* successfully created the pidfile but then crashed without removing
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* it.
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*/
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if (pm_pid > 0 && !postmaster_is_alive((pid_t) pm_pid))
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return PQPING_NO_RESPONSE;
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/* No response, or startup still in process; wait */
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/* No response, or startup still in process; wait */
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#if defined(WIN32)
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#if defined(WIN32)
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if (do_checkpoint)
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if (do_checkpoint)
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@ -715,7 +757,6 @@ do_init(void)
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static void
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static void
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do_start(void)
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do_start(void)
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{
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{
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pgpid_t pid;
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pgpid_t old_pid = 0;
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pgpid_t old_pid = 0;
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int exitcode;
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int exitcode;
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@ -765,19 +806,6 @@ do_start(void)
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exit(1);
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exit(1);
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}
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}
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if (old_pid != 0)
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{
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pg_usleep(1000000);
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pid = get_pgpid();
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if (pid == old_pid)
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{
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write_stderr(_("%s: could not start server\n"
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"Examine the log output.\n"),
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progname);
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exit(1);
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}
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}
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if (do_wait)
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if (do_wait)
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{
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{
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print_msg(_("waiting for server to start..."));
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print_msg(_("waiting for server to start..."));
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