Double-check or replace RRW memtable lock
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Key: CASSANDRA-1954
URL: https://issues.apache.org/jira/browse/CASSANDRA-1954
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Stu Hood
Priority: Minor
Fix For: 0.7.1, 0.8
{quote}...when a Memtable reaches its threshold, up to (all) N write threads
will often notice, and race to acquire the writeLock in order to freeze the
memtable. This means that we do way more writeLock acquisitions than we need
to...{quote}
See CASSANDRA-1930 for backstory, but adding double checking inside a read lock
before trying to re-entrantly acquire the writelock would eliminate most of
these excess writelock acquisitions.
Alternatively, we should explore removing locking from these structures
entirely, and replacing the writeLock acquisition with a per-memtable counter
of active threads.
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