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| author | Pavan Deolasee | 2019-08-08 06:50:56 +0000 |
|---|---|---|
| committer | Pavan Deolasee | 2019-08-08 06:53:49 +0000 |
| commit | 31dfe47342eabe8ad72c000a103e54a94b49c912 (patch) | |
| tree | e45f4eb041b164843dcfad2cd8f3a58f31368d9a | |
| parent | 1369b5cc4f9875857e2fc05e6e66cc7f78eeeaf3 (diff) | |
Emit a WARNING if the first backend doesn't complete initialisationXL_10_STABLE
We have received a report from the field that a backend apparently stuck on
ProcArrayLock in SetGlobalSession(). This is an attempt to check if the stuck
backend is actually looping infinitely, waiting for the leader process in the
distributed session to initialise.
| -rw-r--r-- | src/backend/utils/init/miscinit.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c index 6cb6db29d9..ba510fa949 100644 --- a/src/backend/utils/init/miscinit.c +++ b/src/backend/utils/init/miscinit.c @@ -654,6 +654,7 @@ SetGlobalSession(Oid coordid, int coordpid) BackendId firstBackend = InvalidBackendId; int bCount = 0; int bPids[MaxBackends]; + unsigned int retry_count = 0; /* If nothing changed do nothing */ if (MyCoordId == coordid && MyCoordPid == coordpid) @@ -697,7 +698,14 @@ retry: */ if (bCount > 0) { - /* XXX sleep ? */ + /* + * Sleep for a short while and try again. Emit a WARNING if we + * retry often. + */ + pg_usleep(1000*1000L); + if (++retry_count % 100 == 0) + elog(WARNING, "Retrying %uth time for the first " + "backend to initialise", retry_count); goto retry; } else |