tomcat启动完了之后，一直不停的打印这种错误信息，看表面上，应该是zk节点下的数据是空的，连接不上服务，所以一直在尝试连接，然后一直又连不上；

完整的错误信息：

407662 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

407662 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

408763 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

408763 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

409864 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

409864 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

410965 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

410965 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

412066 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

412066 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

413167 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)

413167 [usf-ZooKeeper:dsf_default-Registry-SendThread(127.0.0.1:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 

                                at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)

        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)

        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

　　原因：又是为了一己之私，省事儿，把服务上的WEB-INFO无情删除，然后用jenkins打包后，就一直有这个问题了，很无奈，找了个大牛给瞅了瞅，说zk一直在尝试连我本地的zk，说明服务上是不是少了一些zk的配置文件呢？大牛给了我提示，我就去classes下看配置文件，和本地的对比了下，果然，少了一个dsf.properties的配置文件，里面就有zk的一些配置，然后手动把这个配置文件给添加到服务上，重启了下，启动成功了！原来这个配置文件是通过提交checklist手动添加的，jenkins不会自动的给打进去，导致了这个尴尬的问题，不过好歹解决了，心里还是松了一口气的！

　　配置文件内容如下，应该都是一些dsf的配置项：

############################################

# DSF Core Configuration

############################################

# dsf app name, keep unique in distributed system

dsf.appname=duiba

# dsf global service timeout in millis

dsf.service.timeout=10000

# core size for dsf handle service request thread pool

dsf.worker.core.size=20

# max size for dsf handle service request thread pool

dsf.worker.max.size=40

# queue size for dsf handler service request thread pool

dsf.worker.queues=1000

logTraceSwitch=true

############################################

# DSF Default trace switch

############################################

dsf.trace.switch=true

dsf.sampleRate=1

############################################

# DSF Fail Policy Configuration

############################################

# dsf request fail policy

dsf.service.failpolicy=failover

############################################

# DSF Fail Over Policy Configuration

############################################

dsf.resend.times=3

# dsf timeout configuraion

dsf.client.request.resend.interval=5

dsf.client.request.resend.times=0

############################################

# DSF Registry Configuration

############################################

dsf.registry.name=zk

dsf.registry.default=zk

############################################

# DSF ZK Registry Configuration

############################################

dsf.registry.zk.type=zookeeper

dsf.registry.zk.connector=DsfZKClient

############################################

# DSF Protocol Configuration

############################################

dsf.protocol.name=dsf

dsf.protocol.default=dsf

############################################

#dsf statistics center switch #default: false

dsf.statistics.switch=false

############################################

# DSF TCP Protocol Configuration

############################################

# dsf tcp protocol type

dsf.protocol.tcp.type=dsf

# dsf tcp protocol listen address,this address must be server address

dsf.protocol.tcp.address=192.168.177.66:22206

#dsf.protocol.tcp.address=10.73.158.171:22106

# max size for dsf tcp protocol acceptor thread pool

dsf.protocol.tcp.threads=1

# queue size for dsf tcp protocol acceptor thread pool

dsf.protocol.tcp.accepts=100

# max size for dsf tcp protocol io thread pool

dsf.protocol.tcp.iothreads=20

# queue size for dsf tcp protocol io thread pool

dsf.protocol.tcp.queues=1000000

# async request waiting quque size for dsf tcp protocol

dsf.protocol.tcp.async.queues=800000

# determine whether dsf tcp protocol iplimit enabled

dsf.protocol.tcp.iplimit.enable=false

# dsf tcp protocol iplimit whiltelist

#dsf.protocol.tcp.iplimit.whitelist=*

# dsf tcp protocol iplimit blacklist

#dsf.protocol.tcp.iplimit.blacklist=

# dsf tcp protocol heartbeat interval in seconds

dsf.protocol.tcp.heartbeat.interval=5

# dsf tcp protocol heartbeat lost count

dsf.protocol.tcp.heartbeat.lostcount=5

# max size for dsf tcp protocol client io thread pool

dsf.protocol.tcp.client.iothreads=1

# queue size for dsf tcp protocol client io thread pool

dsf.protocol.tcp.client.queues=100000

# dsf tcp protocol client reconnect interval in seconds

dsf.protocol.tcp.client.reconnect.interval=3

# dsf tcp protocol client first connect wait time  in millis

dsf.protocol.tcp.client.connect.firstwait=2000

############################################

# DSF Statistic Configuration

############################################

dsf.statistic.delay.enable=false

############################################

# DSF Monitor Configuration

############################################

# dsf time delay monitor time interval in seconds

dsf.monitor.time.interval=30

############################################

# DSF Default Route Policy

############################################

# dsf global route policy, available: poll, random, serviceDelayTimeRouter

dsf.router.default=poll

dsf.router.poll.localpriority=false

##USF config

zk.server.url=10.211.95.114:6830

zk.session.timeout=50000

rpc.address=192.168.177.66:28914

shutdown.graceful.wait.timeout=60000

slow.service.open=true

slow.service.client.time=500

slow.service.server.time=400

##updata to dsf3.0 add begin

# DSF threadpool monitor config

threadpool.monitor.switch=true

# unit(s)

threadpool.monitor.interval=30

dsf.application=duiba

#is need auth when zk client connect zk server,on|off

zk.auth.switch=off

zk.auth.dir=

#is need auth when dsf client connect dsf server,true|false

dsf.authentication.enable=false

dsf.rpc.login.identity=

##updata to dsf3.0 add end

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