After the uncommitted transactions in the redo log buffer of MySQL InnoDB are persisted to the redo log, what happens if the transaction rollback occurs?

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As the title ：mysql innodb Of redo log buffer Middle not commit The transaction is persisted to redo log after , In case of business rollback What should I do? ？redo log How to handle this transaction operation ？ And after the transaction is rolled back buffer pool How to recover the dirty page data inside , Or not commit front , Not modify buffer pool The data in it , So there is no need to restore ？

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