Re: Parallel query fails on standby server
От | Michael Paquier |
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Тема | Re: Parallel query fails on standby server |
Дата | |
Msg-id | CAB7nPqTtUG=uLWvnXRA-xVyuXyvhKvQDPYdc4-NR5dqpNDr1+g@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Parallel query fails on standby server (Robert Haas <robertmhaas@gmail.com>) |
Список | pgsql-hackers |
On Wed, Mar 9, 2016 at 12:34 AM, Robert Haas <robertmhaas@gmail.com> wrote: > On Tue, Mar 8, 2016 at 8:23 AM, Michael Paquier > <michael.paquier@gmail.com> wrote: >> On Tue, Mar 8, 2016 at 9:51 PM, Craig Ringer <craig@2ndquadrant.com> wrote: >>> On 8 March 2016 at 20:30, Ashutosh Sharma <ashu.coek88@gmail.com> wrote: >>>> >>>> While testing a parallel scan feature on standby server, it is found that >>>> the parallel query fails with an error "ERROR: failed to initialize >>>> transaction_read_only to 0". >>>> >>> >>> Looks like it might be a good idea to add some tests to src/test/recovery >>> for parallel query on standby servers... >> >> An even better thing would be a set of read-only tests based on the >> database "regression" generated by make check, itself run with >> pg_regress. > > I'm not sure anything in the main regression suite actually goes > parallel right now, which is probably the first thing to fix. > > Unless, of course, you use force_parallel_mode=regress, max_parallel_degree>0. I was thinking about a test in src/test/recovery, that runs a standby and a master. pg_regress with the main recovery test suite is run on the master, then a second pg_regress run happens with a set of read-only queries, set with sql/expected located in src/test/recovery directly for example. Do we actually have a buildfarm animal using those parameters in extra_config? -- Michael
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