报错：Unable to check if JNs are ready for formatting

完整报错信息：

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:
192.168.19.111:8485: Call From Maricle01/192.168.19.111 to Maricle01:8485 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:896)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:171)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:929)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1371)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1496)
19/07/19 22:52:25 INFO ipc.Client: Retrying connect to server: Maricle03/192.168.19.113:8485. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
19/07/19 22:52:25 FATAL namenode.NameNode: Failed to start namenode.
org.apache.hadoop.hdfs.qjournal.client.QuorumException: Unable to check if JNs are ready for formatting. 1 exceptions thrown:
192.168.19.111:8485: Call From Maricle01/192.168.19.111 to Maricle01:8485 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:896)
        at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:171)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:929)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1371)
        at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1496)
19/07/19 22:52:25 INFO util.ExitUtil: Exiting with status 1

解决办法：格式化之前，先启动zookeeper后，在启动journal，在进行格式化，就可以了