一台hbase 挂了， 奇怪的是  web 页面显示两个节点挂了。 

但是切换master 以后， 就只有一个节点挂了。

region server报错： 

2021-05-26 14:25:09,494 WARN  [regionserver/hadoop-xxx.pconline.ctc/192.168.xxxx:16020] regionserver.HRegionServer: reportForDuty failed; sleeping and then retrying.

2021-05-26 14:25:12,495 INFO  [regionserver/hadoop-xxx.pconline.ctc/192.168.xxxx:16020] regionserver.HRegionServer: reportForDuty to master=hadoop-xxxx.pconline.ctc,16000,1622009355759 with port=16020, startcode=1622010305367

2021-05-26 14:25:12,496 WARN  [regionserver/hadoop-yyyyy.pconline.ctc/192.168.xxxx:16020] regionserver.HRegionServer: error telling master we are up

com.google.protobuf.ServiceException: java.net.ConnectException: 拒绝连接

        at org.apache.hadoop.hbase.ipc.AbstractRpcClient.callBlockingMethod(AbstractRpcClient.java:223)

        at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.callBlockingMethod(AbstractRpcClient.java:287)

        at org.apache.hadoop.hbase.protobuf.generated.RegionServerStatusProtos$RegionServerStatusService$BlockingStub.regionServerStartup(RegionServerStatusProtos.java:8982)

        at org.apache.hadoop.hbase.regionserver.HRegionServer.reportForDuty(HRegionServer.java:2270)

        at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:894)

        at java.lang.Thread.run(Thread.java:744)

百思不得解。 

最后留意到  

 [regionserver/hadoop-xxx.pconline.ctc/192.168.xxxx:16020] 

是两台不同的主机跟ip 。 

按理说 向 master 报告应该是报告自己启动了。 

恍惚中， 看看 了下 /etc/hosts 配置 

果然出问题了

不知道时候，  hosts 配置错了。  估计是哪个呆瓜。复制粘贴的时候，搞错了。 

修改、etc/hosts  问题搞定。