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: To the ad hoc NYCB search debugging team (which is Brendan and someone else, I forget who): I found the cause of the index corruption. It was happening when there were outstanding index updates and two people hit the search CGI at the same time. Both CGIs were simultaneously processing the index updates and saving the index, which caused random corruption. I added locking and I can't duplicate the problem anymore on my computer. Hopefully NYCB will be as fortunate.

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