解决方法：
(先确保你的每个节点网络设置中 勾选了 Available to all users)
重点来了!!!——> 先用./zkServer.sh start 启动各个zookeeper，再用./ hadoop-daemon.sh start journalnode启动各个NodeName上的 JournalNode进程。然后再进行格式化即可。
问题描述：
Re-format filesystem in Storage Directory /itcast/hadoop-2.6.0/tmp/dfs/name ? (Y or N) y
16/04/17 10:47:26 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:26 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:26 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:27 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:27 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:27 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:28 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:28 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:28 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:29 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:29 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:29 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 3 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:30 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:30 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:30 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:31 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:31 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:31 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:32 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:32 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:32 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:33 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:33 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:33 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:34 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:34 INFO ipc.Client: Retrying connect to server: itcast05/192.168.1.205:8485. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:34 INFO ipc.Client: Retrying connect to server: itcast07/192.168.1.207:8485. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:35 INFO ipc.Client: Retrying connect to server: itcast06/192.168.1.206:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
16/04/17 10:47:35 WARN namenode.NameNode: Encountered exception during format:
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Unable to check if JNs are ready for formatting. 1 exceptions thrown:
192.168.1.206:8485: Call From itcast01/192.168.1.201 to itcast06:8485 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.QuorumJournalManager.hasSomeData(QuorumJournalManager.java:232)
at org.apache.hadoop.hdfs.server.common.Storage.confirmFormat(Storage.java:884)
at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:171)
at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:937)
at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1379)
at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1504)