近日，在搭建Hadoop HA QJM集群的时候，出现一个问题，如本文标题。
网上有很多HA的博文，其实比较好的博文就是官方文档，讲的已经非常详细。所以，HA的搭建这里不再赘述。
本文就想给出一篇org.apache.hadoop.ipc.Client: Retrying connect to server错误的解决的方法。
因为在搜索引擎中输入了错误问题，没有找到一篇解决问题的。这里写一篇备忘，也可以给出现同样问题的朋友一个提示。
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: ${dfs.web.authentication.kerberos.principal}
2016-03-09 10:50:28,048 INFO org.apache.hadoop.hdfs.DFSUtil: Starting Web-server for hdfs at: http://node1:50070
2016-03-09 10:50:28,121 INFO org.mortbay.log: Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
2016-03-09 10:50:28,128 INFO org.apache.hadoop.http.HttpRequestLog: Http request log for http.requests.namenode is not defined
2016-03-09 10:50:28,145 INFO org.apache.hadoop.http.HttpServer2: Added global filter 'safety' (class=org.apache.hadoop.http.HttpServer2$QuotingInputFilter)
2016-03-09 10:50:28,149 INFO org.apache.hadoop.http.HttpServer2: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context hdfs
2016-03-09 10:50:28,149 INFO org.apache.hadoop.http.HttpServer2: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context static
2016-03-09 10:50:28,149 INFO org.apache.hadoop.http.HttpServer2: Added filter static_user_filter (class=org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter) to context logs
2016-03-09 10:50:28,209 INFO org.apache.hadoop.http.HttpServer2: Added filter 'org.apache.hadoop.hdfs.web.AuthFilter' (class=org.apache.hadoop.hdfs.web.AuthFilter)
2016-03-09 10:50:28,211 INFO org.apache.hadoop.http.HttpServer2: addJerseyResourcePackage: packageName=org.apache.hadoop.hdfs.server.namenode.web.resources;org.apache.hadoop.hdfs.web.resources, pathSpec=/webhdfs/v1/*
2016-03-09 10:50:28,268 INFO org.apache.hadoop.http.HttpServer2: Jetty bound to port 50070
2016-03-09 10:50:28,269 INFO org.mortbay.log: jetty-6.1.26
2016-03-09 10:50:28,580 WARN org.apache.hadoop.security.authentication.server.AuthenticationFilter: 'signature.secret' configuration not set, using a random value as secret
2016-03-09 10:50:28,648 INFO org.mortbay.log: Started HttpServer2$SelectChannelConnectorWithSafeStartup@node1:50070
2016-03-09 10:50:28,687 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Only one p_w_picpath storage directory (dfs.namenode.name.dir) configured. Beware of data loss due to lack of redundant storage directories!
2016-03-09 10:50:28,741 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsLock is fair:true
2016-03-09 10:50:28,802 INFO org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
2016-03-09 10:50:28,802 INFO org.apache.hadoop.hdfs.server.blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
2016-03-09 10:50:28,805 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
2016-03-09 10:50:28,807 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: The block deletion will start around 2016 Mar 09 10:50:28
2016-03-09 10:50:28,810 INFO org.apache.hadoop.util.GSet: Computing capacity for map BlocksMap
2016-03-09 10:50:28,810 INFO org.apache.hadoop.util.GSet: VM type = 64-bit
2016-03-09 10:50:28,813 INFO org.apache.hadoop.util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
2016-03-09 10:50:28,813 INFO org.apache.hadoop.util.GSet: capacity = 2^21 = 2097152 entries
2016-03-09 10:50:28,852 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: dfs.block.access.token.enable=false
2016-03-09 10:50:28,852 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: defaultReplication = 3
2016-03-09 10:50:28,852 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: maxReplication = 512
2016-03-09 10:50:28,852 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: minReplication = 1
2016-03-09 10:50:28,853 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: maxReplicationStreams = 2
2016-03-09 10:50:28,853 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: shouldCheckForEnoughRacks = false
2016-03-09 10:50:28,853 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: replicationRecheckInterval = 3000
2016-03-09 10:50:28,853 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: encryptDataTransfer = false
2016-03-09 10:50:28,853 INFO org.apache.hadoop.hdfs.server.blockmanagement.BlockManager: maxNumBlocksToLog = 1000
2016-03-09 10:50:28,859 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: fsOwner = hadoop (auth:SIMPLE)
2016-03-09 10:50:28,859 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: supergroup = supergroup
2016-03-09 10:50:28,859 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: isPermissionEnabled = true
2016-03-09 10:50:28,865 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Determined nameservice ID: hadoopha
2016-03-09 10:50:28,865 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: HA Enabled: true
2016-03-09 10:50:28,866 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Append Enabled: true
2016-03-09 10:50:29,120 INFO org.apache.hadoop.util.GSet: Computing capacity for map INodeMap
2016-03-09 10:50:29,120 INFO org.apache.hadoop.util.GSet: VM type = 64-bit
2016-03-09 10:50:29,120 INFO org.apache.hadoop.util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
2016-03-09 10:50:29,120 INFO org.apache.hadoop.util.GSet: capacity = 2^20 = 1048576 entries
2016-03-09 10:50:29,174 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Caching file names occuring more than 10 times
2016-03-09 10:50:29,186 INFO org.apache.hadoop.util.GSet: Computing capacity for map cachedBlocks
2016-03-09 10:50:29,186 INFO org.apache.hadoop.util.GSet: VM type = 64-bit
2016-03-09 10:50:29,186 INFO org.apache.hadoop.util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
2016-03-09 10:50:29,186 INFO org.apache.hadoop.util.GSet: capacity = 2^18 = 262144 entries
2016-03-09 10:50:29,188 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
2016-03-09 10:50:29,188 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
2016-03-09 10:50:29,188 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: dfs.namenode.safemode.extension = 30000
2016-03-09 10:50:29,190 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Retry cache on namenode is enabled
2016-03-09 10:50:29,190 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
2016-03-09 10:50:29,194 INFO org.apache.hadoop.util.GSet: Computing capacity for map NameNodeRetryCache
2016-03-09 10:50:29,194 INFO org.apache.hadoop.util.GSet: VM type = 64-bit
2016-03-09 10:50:29,194 INFO org.apache.hadoop.util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
2016-03-09 10:50:29,194 INFO org.apache.hadoop.util.GSet: capacity = 2^15 = 32768 entries
2016-03-09 10:50:29,199 INFO org.apache.hadoop.hdfs.server.namenode.NNConf: ACLs enabled? false
2016-03-09 10:50:29,199 INFO org.apache.hadoop.hdfs.server.namenode.NNConf: XAttrs enabled? true
2016-03-09 10:50:29,199 INFO org.apache.hadoop.hdfs.server.namenode.NNConf: Maximum size of an xattr: 16384
2016-03-09 10:50:29,208 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/hadoop/hadoop/tmp/dfs/name/in_use.lock acquired by nodename 4394@node1
2016-03-09 10:50:29,610 WARN org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory: The property 'ssl.client.truststore.location' has not been set, no TrustStore will be loaded
2016-03-09 10:50:31,053 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:31,054 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node3/192.168.56.203:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:31,054 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node4/192.168.56.204:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:32,055 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
此处省去重复的N行
2016-03-09 10:50:35,807 INFO org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager: Waited 6001 ms (timeout=20000 ms) for a response for selectInputStreams. No responses yet.
此处省去重复的N行
2016-03-09 10:50:39,812 INFO org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager: Waited 10006 ms (timeout=20000 ms) for a response for selectInputStreams. No responses yet.
2016-03-09 10:50:40,065 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node3/192.168.56.203:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:40,065 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node4/192.168.56.204:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:40,065 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:40,069 WARN org.apache.hadoop.hdfs.server.namenode.FSEditLog: Unable to determine input streams from QJM to [192.168.56.202:8485, 192.168.56.203:8485, 192.168.56.204:8485]. Skipping.
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions to achieve quorum size 2/3. 3 exceptions thrown:
192.168.56.202:8485: Call From node1/192.168.56.201 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.203:8485: Call From node1/192.168.56.201 to node3:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.204:8485: Call From node1/192.168.56.201 to node4:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)
at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:223)
at org.apache.hadoop.hdfs.qjournal.client.AsyncLoggerSet.waitForWriteQuorum(AsyncLoggerSet.java:142)
at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.selectInputStreams(QuorumJournalManager.java:471)
at org.apache.hadoop.hdfs.server.namenode.JournalSet.selectInputStreams(JournalSet.java:260)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1430)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1450)
at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:636)
at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:279)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:955)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:700)
at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:529)
at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:585)
at org.apache.hadoop.hdfs.server.namenode.NameNode.
at org.apache.hadoop.hdfs.server.namenode.NameNode.
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1407)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1473)
2016-03-09 10:50:40,071 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: No edit log streams selected.
2016-03-09 10:50:40,116 INFO org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode: Loading 1 INodes.
2016-03-09 10:50:40,174 INFO org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf: Loaded FSImage in 0 seconds.
2016-03-09 10:50:40,174 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Loaded p_w_picpath for txid 0 from /home/hadoop/hadoop/tmp/dfs/name/current/fsp_w_picpath_0000000000000000000
2016-03-09 10:50:40,184 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Need to save fs p_w_picpath? false (staleImage=true, haEnabled=true, isRollingUpgrade=false)
2016-03-09 10:50:40,185 INFO org.apache.hadoop.hdfs.server.namenode.NameCache: initialized with 0 entries 0 lookups
2016-03-09 10:50:40,185 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Finished loading FSImage in 10986 msecs
2016-03-09 10:50:40,408 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: RPC server is binding to node1:8020
2016-03-09 10:50:40,414 INFO org.apache.hadoop.ipc.CallQueueManager: Using callQueue class java.util.concurrent.LinkedBlockingQueue
2016-03-09 10:50:40,429 INFO org.apache.hadoop.ipc.Server: Starting Socket Reader #1 for port 8020
2016-03-09 10:50:40,461 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Registered FSNamesystemState MBean
2016-03-09 10:50:40,474 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of blocks under construction: 0
2016-03-09 10:50:40,474 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Number of blocks under construction: 0
2016-03-09 10:50:40,475 INFO org.apache.hadoop.hdfs.StateChange: STATE* Leaving safe mode after 11 secs
2016-03-09 10:50:40,475 INFO org.apache.hadoop.hdfs.StateChange: STATE* Network topology has 0 racks and 0 datanodes
2016-03-09 10:50:40,475 INFO org.apache.hadoop.hdfs.StateChange: STATE* UnderReplicatedBlocks has 0 blocks
2016-03-09 10:50:40,536 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2016-03-09 10:50:40,539 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 8020: starting
2016-03-09 10:50:40,542 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: NameNode RPC up at: node1/192.168.56.201:8020
2016-03-09 10:50:40,542 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Starting services required for standby state
2016-03-09 10:50:40,545 INFO org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer: Will roll logs on active node at node5/192.168.56.205:8020 every 120 seconds.
2016-03-09 10:50:40,550 INFO org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Starting standby checkpoint thread...
Checkpointing active NN at http://node5:50070
Serving checkpoints at http://node1:50070
2016-03-09 10:50:41,551 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
此处省去重复的N行
2016-03-09 10:50:50,557 INFO org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager: Waited 10007 ms (timeout=20000 ms) for a response for selectInputStreams. No responses yet.
2016-03-09 10:50:50,561 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node3/192.168.56.203:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:50,626 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node4/192.168.56.204:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:50,676 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2016-03-09 10:50:50,677 WARN org.apache.hadoop.hdfs.server.namenode.FSEditLog: Unable to determine input streams from QJM to [192.168.56.202:8485, 192.168.56.203:8485, 192.168.56.204:8485]. Skipping.
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions to achieve quorum size 2/3. 3 exceptions thrown:
192.168.56.202:8485: Call From node1/192.168.56.201 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.203:8485: Call From node1/192.168.56.201 to node3:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.204:8485: Call From node1/192.168.56.201 to node4:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)
at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:223)
at org.apache.hadoop.hdfs.qjournal.client.AsyncLoggerSet.waitForWriteQuorum(AsyncLoggerSet.java:142)
at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.selectInputStreams(QuorumJournalManager.java:471)
at org.apache.hadoop.hdfs.server.namenode.JournalSet.selectInputStreams(JournalSet.java:260)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1430)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.selectInputStreams(FSEditLog.java:1450)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer.doTailEdits(EditLogTailer.java:212)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:324)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$200(EditLogTailer.java:282)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:299)
at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:411)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:295)
2016-03-09 10:50:50,677 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Stopping services started for standby state
2016-03-09 10:50:50,678 WARN org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer: Edit log tailer interrupted
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.doWork(EditLogTailer.java:337)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.access$200(EditLogTailer.java:282)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread$1.run(EditLogTailer.java:299)
at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:411)
at org.apache.hadoop.hdfs.server.namenode.ha.EditLogTailer$EditLogTailerThread.run(EditLogTailer.java:295)
2016-03-09 10:50:50,682 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Starting services required for active state
2016-03-09 10:50:50,684 WARN org.apache.hadoop.security.ssl.FileBasedKeyStoresFactory: The property 'ssl.client.truststore.location' has not been set, no TrustStore will be loaded
2016-03-09 10:50:50,690 INFO org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager: Starting recovery process for unclosed journal segments...
2016-03-09 10:50:51,698 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node3/192.168.56.203:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
此处省去重复的N行
2016-03-09 10:51:00,715 FATAL org.apache.hadoop.hdfs.server.namenode.FSEditLog: Error: recoverUnfinalizedSegments failed for required journal (JournalAndStream(mgr=QJM to [192.168.56.202:8485, 192.168.56.203:8485, 192.168.56.204:8485], stream=null))
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions to achieve quorum size 2/3. 3 exceptions thrown:
192.168.56.203:8485: Call From node1/192.168.56.201 to node3:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.202:8485: Call From node1/192.168.56.201 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
192.168.56.204:8485: Call From node1/192.168.56.201 to node4:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
at org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)
at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:223)
at org.apache.hadoop.hdfs.qjournal.client.AsyncLoggerSet.waitForWriteQuorum(AsyncLoggerSet.java:142)
at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.createNewUniqueEpoch(QuorumJournalManager.java:182)
at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.recoverUnfinalizedSegments(QuorumJournalManager.java:436)
at org.apache.hadoop.hdfs.server.namenode.JournalSet$7.apply(JournalSet.java:590)
at org.apache.hadoop.hdfs.server.namenode.JournalSet.mapJournalsAndReportErrors(JournalSet.java:359)
at org.apache.hadoop.hdfs.server.namenode.JournalSet.recoverUnfinalizedSegments(JournalSet.java:587)
at org.apache.hadoop.hdfs.server.namenode.FSEditLog.recoverUnclosedStreams(FSEditLog.java:1361)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startActiveServices(FSNamesystem.java:1068)
at org.apache.hadoop.hdfs.server.namenode.NameNode$NameNodeHAContext.startActiveServices(NameNode.java:1624)
at org.apache.hadoop.hdfs.server.namenode.ha.ActiveState.enterState(ActiveState.java:61)
at org.apache.hadoop.hdfs.server.namenode.ha.HAState.setStateInternal(HAState.java:63)
at org.apache.hadoop.hdfs.server.namenode.ha.StandbyState.setState(StandbyState.java:49)
at org.apache.hadoop.hdfs.server.namenode.NameNode.transitionToActive(NameNode.java:1502)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.transitionToActive(NameNodeRpcServer.java:1197)
at org.apache.hadoop.ha.protocolPB.HAServiceProtocolServerSideTranslatorPB.transitionToActive(HAServiceProtocolServerSideTranslatorPB.java:107)
at org.apache.hadoop.ha.proto.HAServiceProtocolProtos$HAServiceProtocolService$2.callBlockingMethod(HAServiceProtocolProtos.java:4460)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:585)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:928)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2013)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2009)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1614)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2007)
2016-03-09 10:51:00,717 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
2016-03-09 10:51:00,718 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at node1/192.168.56.201
************************************************************/
二、问题分析
看着日志很长，来分析一下，注意看日志中使用颜色突出的部分。
可以肯定NameNode不能正常运行，不是配置错了，而是不能连接上JournalNode、
查看JournalNode的日志没有问题，那么问题就在JournalNode的客户端NameNode。
2016-03-09 10:50:31,053 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node2/192.168.56.202:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
来分析上句的日志：
NameNode作为JournalNode的客户端发起连接请求，但是失败了，然后NameNode又向其他节点依次发起了请求都失败了，直至到了最大重试次数。
通过实验知道，先启动JournalNode或者再次启动NameNode就可以了，说明JournalNode并没有准备好，而NameNode已经用完了所有重试次数。
三、解决办法
修改core-site.xml中的ipc参数
a server connection.
before retrying to establish a server connection.
Namenode向JournalNode发起的ipc连接请求的重试间隔时间和重试次数，我的虚拟机集群实验大约需要2分钟，NameNode即可连接上JournalNode。连接后很稳定。
注意：仅对于这种由于服务没有启动完成造成连接超时的问题，都可以调整core-site.xml中的ipc参数来解决。如果目标服务本身没有启动成功，这边调整ipc参数是无效的。