Comment 4 for bug 1042036

Talked about this with Daniel, and the consensus was that it's not worth merging into the 2.1 series as it might break something, and the problem isn't too widespread. It *might* make it into the 2.2 series, but more than likely it'll simply stop being a problem once we merge pt-table-checksum and pt-table-sync. Until then, people with this issue will have to make do with using this version of pt-table-sync.