[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- REL9_5_STABLE Details --- http://git.postgresql.org/pg/commitdiff/aeaaf62aa57a6b8d35a092b4897a801e1881a9a0 Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- REL9_6_STABLE Details --- http://git.postgresql.org/pg/commitdiff/746ba76f1e15e2a7de1bda1eab9b1b8d84875ea5 Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- REL9_3_STABLE Details --- http://git.postgresql.org/pg/commitdiff/5c5788e901e2bc3ec242d0a22de8b7d8a5ddb69b Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- master Details --- http://git.postgresql.org/pg/commitdiff/c6a389792e08980e395055ac219303cf4357ba33 Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- REL9_4_STABLE Details --- http://git.postgresql.org/pg/commitdiff/806f9b3d764c35bf584fdb674267e8d910ee08bb Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
[COMMITTERS] pgsql: Avoid useless respawining the autovacuum launcher at high speed.
Avoid useless respawining the autovacuum launcher at high speed. When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nabqknnykkma0e8c+r...@mail.gmail.com Branch -- REL9_2_STABLE Details --- http://git.postgresql.org/pg/commitdiff/5dff230eb1c3c72dd9f0e8fbf2040d65b96e1fba Modified Files -- src/backend/postmaster/autovacuum.c | 24 +++- 1 file changed, 23 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
