[suggestion]Is writing relay log necessary in slave?

[feng guo]

I have a question about slave's relay log mechanism -- Why is relay log necessary?Why not applying SQL after getting master's binlog immediately?
What I mean is to disable writing relay log to disk, just use a small memory area to receive binlog from master and then executing master's binlog SQL,When a SQL statement was applied,then writing this SQL's corresponding master's binlog file name and position to an transaction safe table,even slave crashes suddenly, reading this transaction safe table could know where to receive from master~
I think this approach could avoid slave disk's relay log writing load～

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