HA集群中namenode连接不上journalnode,导致namenode启动不了

查看日志发现一下的错误：

2018-10-08 15:29:26,373 FATAL org.apache.hadoop.hdfs.server.namenode.FSEditLog: Error: recoverUnfinalizedSegments failed for required journal (JournalAndStream(mgr=QJM to [192.168.135.71:8485, 192.168.135.72:8485, 192.168.135.73:8485], stream=null)) org.apache.hadoop.hdfs.qjournal.client.QuorumException: Got too many exceptions to achieve quorum size 2/3. 3 exceptions thrown: 192.168.135.72:8485: Call From mini2/192.168.135.72 to mini2:8485 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wi ki.apache.org/hadoop/ConnectionRefused 192.168.135.71:8485: Call From mini2/192.168.135.72 to mini1:8485 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wi ki.apache.org/hadoop/ConnectionRefused 192.168.135.73:8485: Call From mini2/192.168.135.72 to mini3:8485 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wi ki.apache.org/hadoop/ConnectionRefused

解决方法：

方法一：首先手动启动journalnode，再手动启动namenode

方法二：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 establisha 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>