Chorde

Bugfixes
- Fix broker state listener states on some corner-case
error handling in coherence manager that might cause it
to have both listener and broker event listeners registered
with the ipsub channel

Bugfixes
- Fix NamespaceMirrorWrapper.clear by properly proxying
writes on revision and revmark_ttl
- Make LazyCuckooCache's rehash (resize) operation
atomic to avoid concurrent rehashing, which can cause
corruption and crashes in rare corner cases, most
notably with non-preallocated caches that grow very
rapidly from concurrent writer threads and cause
eviction callbacks due to hash collisions during
rehashing.

Changed
- Each client has a different logger

Bugfixes
- Fix TieredInclusiveClient's handling of REGET during
coherence. In cases where high load might make the
L1 expiration be missed by the time putnext gets
the REGET reply, the way REGET was implemented might
step on fresh values of the cache with old ones
inadvertantly. Check the values' TTL befure using it
in a REGET, inhibit caller's reget, and use promotion
logic instead.

Changed
- Made ttl_skip not return default/CacheMissError when the
only available value is below the skip threshold. Instead,
return the available item as does TieredInclusiveCache.
The logic works better with lazy decorators and async
refresh in this way, and is more uniform across clients.
- FastMemcachedClient: Refresh DNS in the bgwriter thread
to avoid latency spikes caused by DNS queries

Added
- Support for getMulti and getTtlMulti to all clients,
with optimized versions for memcached
- An option tcp_nodelay to MemcachedStoreClient to reduce
latency in latency-sensitive applications
- Add a LazyCuckooCache implementing a lazy form of
cuckoo hashing (ie: without relocation) to implement a
quasi-LRU eviction strategy with O(1) reads and updates

Initial release


[Note]
This changelog format is taken from http://keepachangelog.com/.