Sorry, the pg_stat_activity sql was executed from a session connecting to a wrong postgresql. It DOES show in the view, and the wait event is SyncRep.
postgres=# select * from pg_stat_activity where application_name='psql' and datname='example'; -[ RECORD 1 ]----+-------------------------------------- .... wait_event_type | IPC wait_event | SyncRep state | active
We are using sync replication, if a session runs an insert, and then commit, the client is actually waiting for commit to complete, but looks like this wait doesn't show in pg_stat_activity.
In one session I inserted a row (auto commit), it hangs there.
example=# insert into test_timteout select '1'; ^CCancel request sent WARNING: canceling wait for synchronous replication due to user request DETAIL: The transaction has already committed locally, but might not have been replicated to the standby. INSERT 0 1 example=# select pg_backend_pid(); pg_backend_pid ---------------- 19325 (1 row)
During the hung period.
postgres=# select * from pg_stat_activity where pid=19325; (0 rows)
postgres=#
If there is no event for such commit, anyway to find out such session which pending on commit(sync replication)
