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If queries are still running when the shutdown is initiated, they will finish _during_ the shutdown. In that case, they might request chunk eviction upon unpinning their pinned chunks. That might completely fill the evict request queue _after_ draining it during storage shutdown. If that ever happens (which is the case if there are _many_ queries still running during shutdown), the affected queries will be stuck while keeping a fingerprint locked. The checkpointing can then not process that fingerprint (or one that shares the same lock). And then we are deadlocked. |
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