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MDEV-232: Remove one fsync() from commit phase.
Introduce a new storage engine API method commit_checkpoint_request(). This is used to replace the fsync() at the end of every storage engine commit with a single fsync() when a binlog is rotated. Binlog rotation is now done during group commit instead of being delayed until unlog(), removing some server stall and avoiding an expensive lock/unlock of LOCK_log inside unlog().
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@ -54,7 +54,7 @@ master-bin.000002 # Query # # COMMIT
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SELECT * FROM t1;
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a
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2
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show relaylog events in 'slave-relay-bin.000005' from <binlog_start> limit 4,5;
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show relaylog events in 'slave-relay-bin.000005' from <binlog_start> limit 5,5;
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Log_name Pos Event_type Server_id End_log_pos Info
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slave-relay-bin.000005 # Query # # BEGIN
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slave-relay-bin.000005 # Query # # # Dummy ev
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