REP-5963 Migrate recheck queue to per-generation collections #105
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Previously we stored the entire recheck queue in a single collection. This meant that, when we finished a generation, we had to “surgically” delete all rechecks for the old generation.
This changeset alters the metadata so that, rather than a storing rechecks in a single collection, we store them in generation-specific collections like
recheckQueue_gen0,recheckQueue_gen1, etc. That way, when we want to clean out a prior generation’s recheck queue, we just drop a collection, which is much faster than deleting 100s of millions of individual recheck documents.