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crash recovery Summary ======= When doing server recovery, the active transactions will be rolled back by InnoDB background rollback thread automatically. The prepared transactions will be committed or rolled back accordingly by binlog recovery. Binlog recovery is done in main thread before the server can provide service to users. If there is a big transaction to rollback, the server will not available for a long time. This patch provides a way to rollback the prepared transactions asynchronously. Thus the rollback will not block server startup. Design ====== - Handler::recover_rollback_by_xid() This patch provides a new handler interface to rollback transactions in recover phase. InnoDB just set the transaction's state to active. Then the transaction will be rolled back by the background rollback thread. - Handler::signal_tc_log_recover_done() This function is called after tc log is opened(typically binlog opened) has done. When this function is called, all transactions will be rolled back have been reverted to ACTIVE state. Thus it starts rollback thread to rollback the transactions. - Background rollback thread With this patch, background rollback thread is defered to run until binlog recovery is finished. It is started by innobase_tc_log_recovery_done(). |
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