Обсуждение: pgsql: Fix ReinitializeParallelDSM to tolerate finding no errorqueues.
Fix ReinitializeParallelDSM to tolerate finding no error queues. Commit d4663350646ca0c069a36d906155a0f7e3372eb7 changed things so that shm_toc_lookup would fail with an error rather than silently returning NULL in the hope that such failures would be reported in a useful way rather than via a system crash. However, it overlooked the fact that the lookup of PARALLEL_KEY_ERROR_QUEUE in ReinitializeParallelDSM is expected to fail when no DSM segment was created in the first place; in that case, we end up with a backend-private memory segment that still contains an entry for PARALLEL_KEY_FIXED but no others. Consequently a benign failure to initialize parallelism can escalate into an elog(ERROR); repair. Discussion: http://postgr.es/m/CA+Tgmob8LFw55DzH1QEREpBEA9RJ_W_amhBFCVZ6WMwUhVpOqg@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/445dbd82a3192c6f4d15de012333943882020904 Modified Files -------------- src/backend/access/transam/parallel.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)