Re: [HACKERS] To Signal The postmaster
On Fri, Dec 10, 2010 at 3:51 PM, aaliya zarrin aaliya.zar...@gmail.com wrote: Can anybody tell after finding the trigger file what steps does postgres follow? The server applies all the WAL records available, performs checkpoint, renames recovery.conf, and gets out of recovery mode. Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] To Signal The postmaster
Hi , I want to stop the recovery forcefully what shall I do? Rather say, after finding the trigger file I want postgres to switch over? Which function shall I call? Where the flow is transfer exactly after finding the trigger file? On Fri, Dec 10, 2010 at 2:36 PM, Fujii Masao masao.fu...@gmail.com wrote: On Fri, Dec 10, 2010 at 3:51 PM, aaliya zarrin aaliya.zar...@gmail.com wrote: Can anybody tell after finding the trigger file what steps does postgres follow? The server applies all the WAL records available, performs checkpoint, renames recovery.conf, and gets out of recovery mode. Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Thanks Regards, Aaliya Zarrin (+91)-9160665888
Re: [HACKERS] To Signal The postmaster
On Wed, Dec 8, 2010 at 6:22 PM, Fujii Masao masao.fu...@gmail.com wrote: On Wed, Dec 8, 2010 at 4:59 PM, Heikki Linnakangas heikki.linnakan...@enterprisedb.com wrote: For 9.1, we should think of a better way to do this, perhaps using SIGUSR1 to wake up. Maybe we won't even need the trigger file anymore. If we use SIGUSR1, the mechanism to allow the users to specify the event type seems to be required. For example, we should make the SIGUSR1 handler check not only the shmem (i.e., PMSignalStat) but also the file? What I'm thinking is to make something like pg_ctl promote create the event file specifying the standby promotion in $PGDATA/pg_event or elsewhere, and send SIGUSR1 to postmaster. OTOH, when SIGUSR1 arrives, postmaster checks whether that event file exists. If it does, postmaster removes it and sends the signal to startup process for standby promotion. Thought? Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] To Signal The postmaster
Hi All, Can anybody tell after finding the trigger file what steps does postgres follow? When and how it will set the postgres recovery mode to false? On Thu, Dec 9, 2010 at 3:51 PM, Fujii Masao masao.fu...@gmail.com wrote: On Wed, Dec 8, 2010 at 6:22 PM, Fujii Masao masao.fu...@gmail.com wrote: On Wed, Dec 8, 2010 at 4:59 PM, Heikki Linnakangas heikki.linnakan...@enterprisedb.com wrote: For 9.1, we should think of a better way to do this, perhaps using SIGUSR1 to wake up. Maybe we won't even need the trigger file anymore. If we use SIGUSR1, the mechanism to allow the users to specify the event type seems to be required. For example, we should make the SIGUSR1 handler check not only the shmem (i.e., PMSignalStat) but also the file? What I'm thinking is to make something like pg_ctl promote create the event file specifying the standby promotion in $PGDATA/pg_event or elsewhere, and send SIGUSR1 to postmaster. OTOH, when SIGUSR1 arrives, postmaster checks whether that event file exists. If it does, postmaster removes it and sends the signal to startup process for standby promotion. Thought? Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Thanks Regards, Aaliya Zarrin (+91)-9160665888
Re: [HACKERS] To Signal The postmaster
On Wed, Dec 8, 2010 at 4:59 PM, Heikki Linnakangas heikki.linnakan...@enterprisedb.com wrote: For 9.1, we should think of a better way to do this, perhaps using SIGUSR1 to wake up. Maybe we won't even need the trigger file anymore. If we use SIGUSR1, the mechanism to allow the users to specify the event type seems to be required. For example, we should make the SIGUSR1 handler check not only the shmem (i.e., PMSignalStat) but also the file? Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] To Signal The postmaster
aaliya zarrin escreveu: I want to signal the postmaster (User defined signal) once I created the trigger file (for switch over). Send a SIGHUP to postmaster. Have in mind that it doesn't work on all supported platforms. -- Euler Taveira de Oliveira http://www.timbira.com/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
Re: [HACKERS] To Signal The postmaster
I can not used SIGHUP, as it is already in use. I want to wake up the postmaster once the trigger file is generated and tell it to switch over from standby mode. Is it possible? On Wed, Dec 8, 2010 at 9:17 AM, Fujii Masao masao.fu...@gmail.com wrote: On Tue, Dec 7, 2010 at 4:22 PM, aaliya zarrin aaliya.zar...@gmail.com wrote: Is this provision already there in the code? There ate already SIGUSR1 and SIGUSR2 are handled in the postmaster? is it for the same? SIGUSR1 is already used. SIGUSR2 is actually unused, but reserved for children according to the source code comment. Though I've been thinking about this topic, a good idea doesn't occur to me yet. http://archives.postgresql.org/pgsql-hackers/2010-09/msg00929.php Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center -- Thanks Regards, Aaliya Zarrin (+91)-9160665888
Re: [HACKERS] To Signal The postmaster
On 08.12.2010 06:12, aaliya zarrin wrote: I can not used SIGHUP, as it is already in use. I want to wake up the postmaster once the trigger file is generated and tell it to switch over from standby mode. Is it possible? SIGHUP works precisely because it is already in use. When you send SIGHUP, the startup process will wake up immediately, and reload the configuration file. Reloading the configuration file is unnecessary in this case, but it will wake it up and it will notice the trigger file. For 9.1, we should think of a better way to do this, perhaps using SIGUSR1 to wake up. Maybe we won't even need the trigger file anymore. -- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
[HACKERS] To Signal The postmaster
Hi, I want to signal the postmaster (User defined signal) once I created the trigger file (for switch over). I want to reduce my switch over time further by signaling the postmaster once the trigger file is created. Is this provision already there in the code? There ate already SIGUSR1 and SIGUSR2 are handled in the postmaster? is it for the same? If I handle my own signal using SIGUSR1/SIGUSR2 is it possible without affecting the other functionality of existing code? -- Thanks Regards, Aaliya Zarrin (+91)-9160665888
