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# Lookup all possible text keys to determine which ones actually modified
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text_keys = [(file_id, rev_id) for rev_id, revno, depth in view_revisions]
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# Looking up keys in batches of 1000 can cut the time in half, as well as
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# memory consumption. GraphIndex *does* like to look for a few keys in
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# parallel, it just doesn't like looking for *lots* of keys in parallel.