[Sheepdog] [zookeeper][PATCH v2 00/11] INTRODUCE

[Yunkai Zhang]

From: Yunkai Zhang <qiushu.zyk at taobao.com>

I refactor zookeeper driver with following patches.

Features:
- all operations are lock free
- support more than 1000 nodes
- optimize the size of message
- using zookeeper more efficiently 

These patches have been tested for several weeks in our
100 physical machines, we startup 10 sheep processes in each
machine to simulate 1000 nodes, it works nicely for us.

At this time, accord is not stable enough for us, this new
zookeeper driver maybe a good alternative.

Rebasing these patches is too difficult, hope it can be merged
as soon as quickly, so that we can imporve it more conveniently
in the future.

Yunkai Zhang (11):
  Refactor zookeeper driver
  Optimize the size of buffer send to zookeeper
  retry again when zoo_* api return ZCONNECTIONLOSS/ZOPERATIONTIMEOUT
    error
  Fix two bug:
  Use atomic builtins to replace pthread mutex locks
  Rewatch znode in /sheepdog/member after it changed
  If previous zookeeper session exists, shutdown sheep
  Add code to handle sequence number overflow
  Fix bug: zk_leave doesn't work
  Fix bug: leave event lost in zookeeper driver
  Remove zk_lock from zk_join

 include/net.h             |    1 +
 lib/net.c                 |   14 +
 sheep/cluster.h           |   34 +++-
 sheep/cluster/zookeeper.c |  677 ++++++++++++++++++++++++++++++++++-----------
 4 files changed, 559 insertions(+), 167 deletions(-)

-- 
1.7.7.6