diff options
| author | Robert Haas | 2011-04-03 23:42:00 +0000 |
|---|---|---|
| committer | Robert Haas | 2011-04-03 23:42:00 +0000 |
| commit | 38b27792eae99f5b4db2411f5c57ef70f850df5f (patch) | |
| tree | 87314c9f0634515a9b0a3f2859af9f02e1aa9d7a /src/include/storage/pmsignal.h | |
| parent | d518d6a168797c2e3b9cf03a3b5cfa335be735bb (diff) | |
Avoid possible hang during smart shutdown.
If a smart shutdown occurs just as a child is starting up, and the
child subsequently becomes a walsender, there is a race condition:
the postmaster might count the exstant backends, determine that there
is one normal backend, and wait for it to die off. Had the walsender
transition already occurred before the postmaster counted, it would
have proceeded with the shutdown.
To fix this, have each child that transforms into a walsender kick
the postmaster just after doing so, so that the state machine is
certain to advance.
Fujii Masao
Diffstat (limited to 'src/include/storage/pmsignal.h')
| -rw-r--r-- | src/include/storage/pmsignal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/storage/pmsignal.h b/src/include/storage/pmsignal.h index 97bdc7bc86d..0ca8ca0cc7e 100644 --- a/src/include/storage/pmsignal.h +++ b/src/include/storage/pmsignal.h @@ -29,6 +29,7 @@ typedef enum PMSIGNAL_START_AUTOVAC_LAUNCHER, /* start an autovacuum launcher */ PMSIGNAL_START_AUTOVAC_WORKER, /* start an autovacuum worker */ PMSIGNAL_START_WALRECEIVER, /* start a walreceiver */ + PMSIGNAL_ADVANCE_STATE_MACHINE, /* advance postmaster's state machine */ NUM_PMSIGNALS /* Must be last value of enum! */ } PMSignalReason; |