Multithreaded commitlog
-----------------------
Key: CASSANDRA-3578
URL: https://issues.apache.org/jira/browse/CASSANDRA-3578
Project: Cassandra
Issue Type: Improvement
Reporter: Jonathan Ellis
Priority: Minor
Brian Aker pointed out a while ago that allowing multiple threads to modify the
commitlog simultaneously (reserving space for each with a CAS first, the way we
do in the SlabAllocator.Region.allocate) can improve performance, since you're
not bottlenecking on a single thread to do all the copying and CRC computation.
Now that we use mmap'd CommitLog segments (CASSANDRA-3411) this becomes doable.
(moved from CASSANDRA-622, which was getting a bit muddled.)
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