| commit | 55aaac84804db2ea3893a507471d97bf87d63658 | |
| author | alvherre <alvherre> | |
| Mon, 20 Oct 2008 19:18:18 +0000 (20 19:18 +0000) | ||
| committer | alvherre <alvherre> | |
| Mon, 20 Oct 2008 19:18:18 +0000 (20 19:18 +0000) | ||
| tree | 043e0cf522b4df59affa91bb0449437ba9327144 | treesnapshot (tar.gz zip) |
| parent | 5f9c1caba54f615ba51c45d079c1eb2fcb5e4570 | commitdiff |
Rework subtransaction commit protocol for hot standby.
This patch eliminates the marking of subtransactions as SUBCOMMITTED in pg_clog
during their commit; instead they remain in-progress until main transaction
commit. At main transaction commit, the commit protocol is atomic-by-page
instead of one transaction at a time. To avoid a race condition with some
subtransactions appearing committed before others in the case where they span
more than one pg_clog page, we conserve the logic that marks them subcommitted
before marking the parent committed.
Simon Riggs with minor help from me
This patch eliminates the marking of subtransactions as SUBCOMMITTED in pg_clog
during their commit; instead they remain in-progress until main transaction
commit. At main transaction commit, the commit protocol is atomic-by-page
instead of one transaction at a time. To avoid a race condition with some
subtransactions appearing committed before others in the case where they span
more than one pg_clog page, we conserve the logic that marks them subcommitted
before marking the parent committed.
Simon Riggs with minor help from me