C. Scott Andreas updated CASSANDRA-7040:
    Component/s: Local Write-Read Paths

> Replace read/write stage with per-disk access coordination
> ----------------------------------------------------------
>                 Key: CASSANDRA-7040
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7040
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local Write-Read Paths
>            Reporter: Benedict
>            Priority: Major
>              Labels: performance
>             Fix For: 4.x
> As discussed in CASSANDRA-6995, current coordination of access to disk is 
> suboptimal: instead of ensuring disk accesses alone are coordinated, we 
> instead coordinate at the level of operations that may touch the disks, 
> ensuring only so many are proceeding at once. As such, tuning is difficult, 
> and we incur unnecessary delays for operations that would not touch the 
> disk(s).
> Ideally we would instead simply use a shared coordination primitive to gate 
> access to the disk when we perform a rebuffer. This work would dovetail very 
> nicely with any work in CASSANDRA-5863, as we could prevent any blocking or 
> context switching for data that we know to be cached. It also, as far as I 
> can tell, obviates the need for CASSANDRA-5239.

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