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06da3c570f
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 |
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