三、解决办法
修改core-site.xml中的ipc参数
<property>
<name>ipc.client.connect.max.retries</name>
<value>100</value>
<description>Indicates the number of retries a client will make to establish
a server connection.
</description>
</property>
<property>
<name>ipc.client.connect.retry.interval</name>
<value>10000</value>
<description>Indicates the number of milliseconds a client will wait for
before retrying to establish a server connection.
</description>
</property>
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。