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Oddly, I myself, am having trouble reproducing this. Perhaps it's actually due to row locks?

There are no oopses last week for this, but they appear for the first time in
http://oops.canonical.com/static-reports/LP-PROD-2012-11-01.html
    OOPS-087f61d6004ef6a55d258767a69fb58e

This is a much rarer occurrence of bug 722956 which was once common before code was optimised.

This performs slowly because of the join though branchrevision.

The problem is that getMergeProposals(merged_revision=...) filters against BranchMergeProposal.merged_revno, via BranchRevision and Revision. It should be able to use BranchMergeProposal.merged_revision_id directly, but that doesn't seem to always be set.

The getMergeProposals method has become very slow or times out entirely, making it difficult to retrieve merge proposals as expected. This issue did not occur previously, and performance was normal until recently. Based on our investigation, this appears to be related to branch privacy settings. When querying public branches, the method completes quickly. When private branches are involved, the method hangs or fails. http://www-ipass.com