Benedict created CASSANDRA-7040:
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Summary: 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: Core
Reporter: Benedict
Fix For: 3.0
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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