HSHA Thrift server corruption in Cassandra 2.0.0 - 2.0.5

[Jonathan Ellis <jb...@gmail.com>]

The hsha (half-synchronous, half-asynchronous) Thrift server was
rewritten on top of Disruptor for Cassandra 2.0 [1] to unlock
substantial performance benefits over the old hsha.  Unfortunately,
the rewrite introduced a bug that can cause incorrect data to be sent
from the coordinator to replicas.  I apologize that it took so long
for us to realize what was causing the compaction errors reported as
far back as November.

Who is affected: anyone running the hsha server in a 2.0.x release for x < 6.

Who is NOT affected: anyone using the native protocol or the default
sync Thrift server.

2.0.6 has a fix and is expected to be released Monday; you can grab
the pre-release build from [3], or apply the patch from [4] yourself.

[1] https://issues.apache.org/jira/browse/CASSANDRA-5582
[2] https://issues.apache.org/jira/browse/CASSANDRA-6285
[3] http://people.apache.org/~slebresne/
[4] https://issues.apache.org/jira/secure/attachment/12632583/CASSANDRA-6285-disruptor-heap.patch

-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder, http://www.datastax.com
@spyced