UPD: Here we can see that repair process can be executed in parallel:
http://www.datastax.com/dev/blog/advanced-repair-techniques
From: Plotnik, Alexey
Sent: 24 февраля 2014 г. 12:42
To: user@cassandra.apache.org
Subject: Multi-threaded sub-range repair
1. How many parallel threads is
1. How many parallel threads is safe to have for sub-range repair process
running for a single node?
2. Is Repair process affected `concurrent_compactors` parameter? Should
the `concurrent_compactors` meet the multithreaded repair process needs?
