Обсуждение: pg_basebackup streaming issue from standby
Hi, I've just tried using pg_basebackup to take a backup of a standby with "-x stream" but it never finishes. This is what I get: thom@swift:~/Development$ pg_basebackup -p 5489 -D data3 -x stream -Pv xlog start point: 0/6000020 pg_basebackup: starting background WAL receiver 78020/78020 kB (100%), 1/1 tablespace xlog end point: 0/6F819F8 pg_basebackup: waiting for background process to finish streaming... pg_stat_replication on the standby looks like this: thom@test=# select * from pg_stat_replication ; -[ RECORD 1 ]----+------------------------------ pid | 29161 usesysid | 10 usename | thom application_name | pg_basebackup client_addr | client_hostname | client_port | -1 backend_start | 2012-03-08 01:33:32.799491+00 state | startup sent_location | 0/0 write_location | flush_location | replay_location | sync_priority | 0 sync_state | async -[ RECORD 2 ]----+------------------------------ pid | 29162 usesysid | 10 usename | thom application_name | pg_basebackup client_addr | client_hostname | client_port | -1 backend_start | 2012-03-08 01:33:32.921461+00 state | streaming sent_location | 0/6F819F8 write_location | flush_location | replay_location | sync_priority | 0 sync_state | async It gets stuck here and never finishes. This also prevents the standby from shutting down unless pg_basebackup is terminated. I've attached the log from the standby in case it's of any use (with log_min_messages set to debug5). This is using an unpatched copy of latest Git master. -- Thom
Вложения
On Thu, Mar 8, 2012 at 10:36 AM, Thom Brown <thom@linux.com> wrote: > I've just tried using pg_basebackup to take a backup of a standby with > "-x stream" but it never finishes. Thanks for the report! This is the same problem as I reported before. We are now discussing how to fix that. http://archives.postgresql.org/message-id/CAHGQGwFim5F61AfdLQH4PvARPr0Ace2=9QH62khYGraWY4E5TQ@mail.gmail.com Regards, -- Fujii Masao NIPPON TELEGRAPH AND TELEPHONE CORPORATION NTT Open Source Software Center
On Thu, Mar 8, 2012 at 02:45, Fujii Masao <masao.fujii@gmail.com> wrote: > On Thu, Mar 8, 2012 at 10:36 AM, Thom Brown <thom@linux.com> wrote: >> I've just tried using pg_basebackup to take a backup of a standby with >> "-x stream" but it never finishes. > > Thanks for the report! This is the same problem as I reported before. > We are now discussing how to fix that. > http://archives.postgresql.org/message-id/CAHGQGwFim5F61AfdLQH4PvARPr0Ace2=9QH62khYGraWY4E5TQ@mail.gmail.com Yeah, it sounds like just that issue. And a good kick mmy way that I need to get back on that thread :-) -- Magnus Hagander Me: http://www.hagander.net/ Work: http://www.redpill-linpro.com/
On 8 March 2012 01:45, Fujii Masao <masao.fujii@gmail.com> wrote: > On Thu, Mar 8, 2012 at 10:36 AM, Thom Brown <thom@linux.com> wrote: >> I've just tried using pg_basebackup to take a backup of a standby with >> "-x stream" but it never finishes. > > Thanks for the report! This is the same problem as I reported before. > We are now discussing how to fix that. > http://archives.postgresql.org/message-id/CAHGQGwFim5F61AfdLQH4PvARPr0Ace2=9QH62khYGraWY4E5TQ@mail.gmail.com I hadn't read your previous post before, so apologies for the noise. I did note from your post that the base backup can be finished by generating enough data on the source, which worked for me too. -- Thom