namenode倒换原因分析

<div style="font: 14px/21px 微软雅黑; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; font-size-adjust: none; font-stretch: normal; background-color: rgb(255, 255, 255); -webkit-text-stroke-width: 0px;"><strong>   一，namenode倒换原因分析  </strong></div><div style="font: 14px/21px 微软雅黑; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; font-size-adjust: none; font-stretch: normal; background-color: rgb(255, 255, 255); -webkit-text-stroke-width: 0px;">    ZKFC做的HA的HADOOP集群，某信升级网络以后，经常在凌晨出现这种会话超时的情况</div><div style="font: 14px/21px 微软雅黑; text-align: left; color: rgb(0, 0, 0); text-transform: none; text-indent: 0px; letter-spacing: normal; word-spacing: 0px; white-space: normal; font-size-adjust: none; font-stretch: normal; background-color: rgb(255, 255, 255); -webkit-text-stroke-width: 0px;">下面是zkfc的日志，初步认为是网络问题引起的，以前的超时时间为5000ms.</div>

2015-06-23 11:34:53,393 INFO org.apache.hadoop.ha.SshFenceByTcpPort.jsch: Caught an exception, leaving main loop due to Socket closed
2015-06-23 11:34:53,403 INFO org.apache.hadoop.ha.ZKFailoverController: Trying to make NameNode at M-172-16-189-5/172.16.189.5:8020 active...
2015-06-23 11:34:55,672 INFO org.apache.hadoop.ha.ZKFailoverController: Successfully transitioned NameNode at M-172-16-189-5/172.16.189.5:8020 to active stat
e
2015-06-24 02:00:10,088 INFO org.apache.zookeeper.ClientCnxn: Unable to read additional data from server sessionid 0x14e1e6b5b2d0001, likely server has close
d socket, closing socket connection and attempting reconnect
2015-06-24 02:00:10,202 INFO org.apache.hadoop.ha.ActiveStandbyElector: Session disconnected. Entering neutral mode...
2015-06-24 02:00:10,642 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server 172.16.189.46/172.16.189.46:2181. Will not attempt to authe
nticate using SASL (unknown error)
2015-06-24 02:00:10,643 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to 172.16.189.46/172.16.189.46:2181, initiating session
2015-06-24 02:00:10,647 INFO org.apache.zookeeper.ClientCnxn: Unable to reconnect to ZooKeeper service, session 0x14e1e6b5b2d0001 has expired, closing socketconnection
2015-06-24 02:00:10,650 INFO org.apache.hadoop.ha.ActiveStandbyElector: Session expired. Entering neutral mode and rejoining...
2015-06-24 02:00:10,650 INFO org.apache.hadoop.ha.ActiveStandbyElector: Trying to re-establish ZK session
2015-06-24 02:00:10,656 INFO org.apache.zookeeper.ZooKeeper: Initiating client connection, connectString=172.16.189.120:2181,172.16.189.46:2181,172.16.189.13
4:2181 sessionTimeout=5000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@2540d625
2015-06-24 02:00:10,694 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server 172.16.189.134/172.16.189.134:2181. Will not attempt to aut
henticate using SASL (unknown error)
2015-06-24 02:00:10,696 INFO org.apache.zookeeper.ClientCnxn: Socket connection established to 172.16.189.134/172.16.189.134:2181, initiating session
2015-06-24 02:00:10,848 INFO org.apache.zookeeper.ClientCnxn: Session establishment complete on server 172.16.189.134/172.16.189.134:2181, sessionid = 0x34e1
e6b62c90004, negotiated timeout = 5000
2015-06-24 02:00:10,856 INFO org.apache.hadoop.ha.ActiveStandbyElector: Session connected.
2015-06-24 02:00:10,857 WARN org.apache.hadoop.ha.ActiveStandbyElector: Ignoring stale result from old client with sessionId 0x14e1e6b5b2d0001
2015-06-24 02:00:10,857 INFO org.apache.zookeeper.ClientCnxn: EventThread shut down
2015-06-24 02:00:10,864 INFO org.apache.hadoop.ha.ZKFailoverController: ZK Election indicated that NameNode at M-172-16-189-5/172.16.189.5:8020 should becomestandby
2015-06-24 02:00:10,874 INFO org.apache.hadoop.ha.ZKFailoverController: Successfully transitioned NameNode at M-172-16-189-5/172.16.189.5:8020 to standby sta
te

二，解决办法

由于是租用的服务器，网络问题也管不着尝试一下修改zkfc的session超时时间。

发现在core-site.xml中没有设置，ha.zookeeper.session-timeout.ms,默认为5000ms，果断修改为下面

        <property><name>ha.zookeeper.session-timeout.ms</name><value>10000</value><description>ms</description></property>

重新启动zkfc。

修改的时候注意一下zookeeer的配置，客户端设置的值要在这个范围

#The minimum session timeout in milliseconds that the server will allow the client to negotiate
   minSessionTimeout=2000
   #The maximum session timeout in milliseconds that the server will allow the client to negotiate
    maxSessionTimeout=60000

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