gaodayue opened a new pull request #3269: Optimize performance of TxnManager::build_expire_txn_map URL: https://github.com/apache/incubator-doris/pull/3269 It's not possible to insert duplicated transaction ids for a specific tablet, therefore we could use `map<TabletInfo, vector<int64_t>>` instead of `map<TabletInfo, set<int64_t>>` for expire_txn_map.
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