Обсуждение: Deadlock during CREATE INDEX CONCURRENTLY, but index still created
I've run two CREATE INDEX CONCURRENTLY on the same table in parallel,
and one of them errored out with:
2011-05-18 14:30:06.645 UTC bfk 23530 postgres ERROR: deadlock
detected
2011-05-18 14:30:06.645 UTC bfk 23530 postgres DETAIL: Process
23530 waits for ShareLock on virtual transaction 9/28523127; blocked by
process 26612.
Process 26612 waits for ShareUpdateExclusiveLock on relation
229701 of database 229155; blocked by process 23530.
Process 23530: CREATE INDEX CONCURRENTLY idx1 ON tbl (col1);
Process 26612: CREATE INDEX CONCURRENTLY idx2 ON tbl (col);
The curious thing is that both indexes were created. I would have
expected that the creation of idx1 would be rolled back.
Are both of the usable, or should I re-create idx1 from scratch?
This is with PostgreSQL 8.4.7. (The changelog for 8.4.8 does not list
anything which appears to be relevant.)
--
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
On Wed, May 18, 2011 at 9:19 AM, Florian Weimer <fweimer@bfk.de> wrote: > I've run two CREATE INDEX CONCURRENTLY on the same table in parallel, > and one of them errored out with: > The curious thing is that both indexes were created. I would have > expected that the creation of idx1 would be rolled back. > > Are both of the usable, or should I re-create idx1 from scratch? They should be marked invalid.
* Scott Marlowe: > On Wed, May 18, 2011 at 9:19 AM, Florian Weimer <fweimer@bfk.de> wrote: >> I've run two CREATE INDEX CONCURRENTLY on the same table in parallel, >> and one of them errored out with: >> The curious thing is that both indexes were created. I would have >> expected that the creation of idx1 would be rolled back. >> >> Are both of the usable, or should I re-create idx1 from scratch? > > They should be marked invalid. Ah, thanks, I see it now. I guess this answers my question. 8-) -- Florian Weimer <fweimer@bfk.de> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99