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转自：https://blog.csdn.net/dudefu011/article/details/78463207#
一、问题描述
HA按照规划配置好，启动后，NameNode不能正常启动。刚启动的时候 jps 看到了NameNode，但是隔了一两分钟，再看NameNode就不见了。
但是测试之后，发现下面2种情况：
1）先启动JournalNode，再启动Hdfs，NameNode可以启动并可以正常运行
2）使用start-dfs.sh启动，众多服务都启动了，隔两分钟NameNode会退出，再次hadoop-daemon.sh start namenode单独启动可以成功稳定运行NameNode。
再看NameNode的日志，不要嫌日志长，其实出错的蛛丝马迹都包含其中了，如下：
2016-03-09 10:50:27,123 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = node1/192.168.56.201
STARTUP_MSG: args = []
STARTUP_MSG: version = 2.5.1
STARTUP_MSG: build = Unknown -r Unknown; compiled by ‘root’ on 2014-10-20T05:53Z
STARTUP_MSG: java = 1.7.0_09
************************************************************/
2016-03-09 10:50:27,132 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
2016-03-09 10:50:27,138 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: createNameNode []
2016-03-09 10:50:27,465 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties
2016-03-09 10:50:27,623 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).
2016-03-09 10:50:27,623 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: NameNode metrics system started
2016-03-09 10:50:27,625 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: fs.defaultFS is hdfs://hadoopha
2016-03-09 10:50:27,626 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Clients are to use hadoopha to access this namenode/service.
2016-03-09 10:50:28,048 INFO org.apache.hadoop.hdfs.DFSUtil: Starting web server as:
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{dfs.web.authentication.kerberos.principal} 2016-03-09 10:50:28,048 INFO org.apache.hadoop.hdfs.DFSUtil: Starting Web-server for hdfs at: http://node1:50070 2016-03-09 10:50:28,121 INFO org.mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog 2016-03-09 10:50:28,128 INFO org.apache.hadoop.http.HttpRequestLog: Http request log for http.requests.namenode is not defined 2016-03-09 10:50:28,145 INFO org.apache.hadoop.http.HttpServer2: Added global filter 'safety' (class=org.apache.hadoop.http.HttpServer2
dfs.web.authentication.kerberos.principal2016?03?0910:50:28,048INFOorg.apache.hadoop.hdfs.DFSUtil:StartingWeb?serverforhdfsat:http://node1:500702016?03?0910:50:28,121INFOorg.mortbay.log:Loggingtoorg.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log)viaorg.mortbay.log.Slf4jLog2016?03?0910:
