ceph/ceph — pull request #1976 by guangyy (2014-06-17 11:59:03+00:00)
Title: Phase I - implement bucket index sharding for radosgw

This is the phase one implementation of the bucket index sharding strategy at radosgw, key changes include:
1. Static shard bucket index objects to a configured number of objects.
2. Listing / stats become more expensive due to the fact that it needs to talk to a couple of bucket index shards.

Everything should work as it did with the default configuration.

Testing:
1. Covered object PUT/DELETE, bucket CREATE/LISTING/REMOVAL.
2. Keep radosgw run a couple of hours making sure background thread works.

Todo:
1. Make radosgw-agent to work with the new schema change for marker for bi log.

Signed-off-by: Guang Yang (yguang@yahoo-inc.com)