Code review comment for lp:~abentley/bzr/skip-dupes

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Hi all,

There are several issues related to Launchpad's current problems with
pulling data from incompletely-reconciled repositories. For one thing,
we're incorrectly predicting which records need to be inserted. For
another, we're inserting records that we already have, which wastes disk
space, and causes us to raise exceptions if the record metadata differs.

This patch allows bzr to avoid installing any records which are already
present, which seems like the most robust fix. It would also be nice to
investigate why we're sending too many records.

Aaron
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