Two issues on the evcache

[shengang1978]

1. The evcache.EVCacheClientPool.poolSize=2 setting will cause the memcached unstable.
   If we set the poolSize as 2, the cache client becomes unstable. After several days/hours running and there are about 1M data in cache server, the get/set/delete operation become more and more slow. They needs more than tens seconds.
2. In default, the evcache writes so many logs with info level.
   After we upgrade to the 4.131. 0, the evcache writes so many data, our log database is easy to be full. And it will slow our servers.

[frank-dspeed]

@shengang1978 you should maybe look into couchbase.com as a alternativ for your kind of workloads its also distributed memcached but with some extra services that are optional so you can use it as drop in replacement i often use evcache and migrate to couchbase if needed.