Unable to check if JNs are ready for formatting 问题解决

完整报错信息：

20/10/24 23:47:21 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:
192.168.8.129:8485: Call From node1/192.168.8.128 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefusedat org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:304)at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.hasSomeData(QuorumJournalManager.java:260)at org.apache.hadoop.hdfs.server.common.Storage.confirmFormat(Storage.java:981)at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:208)at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1207)at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1655)at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1782)
20/10/24 23:47:21 ERROR 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:
192.168.8.129:8485: Call From node1/192.168.8.128 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefusedat org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:81)at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:304)at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.hasSomeData(QuorumJournalManager.java:260)at org.apache.hadoop.hdfs.server.common.Storage.confirmFormat(Storage.java:981)at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:208)at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1207)at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1655)at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1782)
20/10/24 23:47:21 INFO util.ExitUtil: Exiting with status 1: org.apache.hadoop.hdfs.qjournal.client.QuorumException: Unable to check if JNs are ready for formatting. 1 exceptions thrown:
192.168.8.129:8485: Call From node1/192.168.8.128 to node2:8485 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

解决办法：格式化之前，分别在各节点启动zookeeper，journal，再进行格式化，就可以了

[root@node1 sbin]# hadoop-daemon.sh start journalnode
[root@node3 conf]# zkServer.sh start

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