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今天在cdh装hbase时，本来以为几分钟就完事了，结果，，，装完后，hmaster启动不起来，看日志报如下错误：
ERROR org.apache.hadoop.hbase.master.HMaster: Failed to become active master
org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=31, exceptions:
Wed May 13 15:20:20 CST 2020, null, java.net.SocketTimeoutException: callTimeout=60000, callDuration=68491: Call to node2/192.168.3.199:60020 failed on connection exception: org.apache.hbase.thirdparty.io.netty.channel.AbstractChannel$AnnotatedCo
nnectException: syscall:getsockopt(..) failed: Connection refused: node2/192.168.3.199:60020 row '' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=node2,60020,1544155968783, seqNum=-1
at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.throwEnrichedException(RpcRetryingCallerWithReadReplicas.java:298)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:242)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:58)
at org.apache.hadoop.hbase.client.RpcRetryingCallerImpl.callWithoutRetries(RpcRetryingCallerImpl.java:192)
at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:269)
at org.apache.hadoop.hbase.client.ClientScanner.loadCache(ClientScanner.java:437)
at org.apache.hadoop.hbase.client.ClientScanner.nextWithSyncCache(ClientScanner.java:312)
at org.apache.hadoop.hbase.client.ClientScanner.next(ClientScanner.java:597)
at org.apache.hadoop.hbase.MetaTableAccessor.scanMeta(MetaTableAccessor.java:754)
at org.apache.hadoop.hbase.MetaTableAccessor.scanMeta(MetaTableAccessor.java:677)
at org.apache.hadoop.hbase.MetaTableAccessor.fullScanTables(MetaTableAccessor.java:226)
at org.apache.hadoop.hbase.master.TableStateManager.fixTableStates(TableStateManager.java:277)
at org.apache.hadoop.hbase.master.TableStateManager.start(TableStateManager.java:269)
at org.apache.hadoop.hbase.master.HMaster.finishActiveMasterInitialization(HMaster.java:910)
at org.apache.hadoop.hbase.master.HMaster.startActiveMasterManager(HMaster.java:2086)
at org.apache.hadoop.hbase.master.HMaster.lambda$run$0(HMaster.java:553)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.SocketTimeoutException: callTimeout=60000, callDuration=68491: Call to node2/192.168.3.199:60020 failed on connection exception: org.apache.hbase.thirdparty.io.netty.channel.AbstractChannel$AnnotatedConnectException: syscall:g
etsockopt(..) failed: Connection refused: node2/192.168.3.199:60020 row '' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=node2,60020,1544155968783, seqNum=-1
at org.apache.hadoop.hbase.client.RpcRetryingCallerImpl.callWithRetries(RpcRetryingCallerImpl.java:159)
at org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:80)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 more
Caused by: java.net.ConnectException: Call to node2/192.168.3.199:60020 failed on connection exception: org.apache.hbase.thirdparty.io.netty.channel.AbstractChannel$AnnotatedConnectException: syscall:getsockopt(..) failed: Connection refused: nod
e2/192.168.3.199:60020
at org.apache.hadoop.hbase.ipc.IPCUtil.wrapException(IPCUtil.java:166)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient.onCallFinished(AbstractRpcClient.java:390)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient.access$100(AbstractRpcClient.java:95)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient$3.run(AbstractRpcClient.java:410)
at org.apache.hadoop.hbase.ipc.AbstractRpcClient$3.run(AbstractRpcClient.java:406)
at org.apache.hadoop.hbase.ipc.Call.callComplete(Call.java:103)
这让我郁闷啊，因为我的node2节点时没有安装hbase服务的，他竟然告我要连接60020端口，于是我第一反应是检查regionservers,但是cdh的regionservers都是默认的local，没有写入东西，于是百度，google找其位置，结果没找到。好吧，有点无奈，于是看hbase.site-xml找zookeeper的信息，并进入zookeeper-clinet客户端下:
查看此文件都是node2de信息，于是认定这是集群以前装过hbase并没有卸载干净导致的，嗯，接下来使用rmr 删除/hbase/meta-region-server，重启hbase，问题得到完美解决
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