安装好hadoop集群后，报错如下n org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /data/hadoop-roo

master错误：

n
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /data/hadoop-root-namenode-master.log._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 0 datanode(s) running and no node(s) are excluded in this operation.

Ｄａｔａｎｏｄｅ报错：

mCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2017-06-07 22:29:32,659 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.86.133:9000. Already tried 5 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2017-06-07 22:29:33,660 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.86.133:9000. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2017-06-07 22:29:34,663 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.86.133:9000. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2017-06-07 22:29:35,666 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.86.133:9000. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2017-06-07 22:29:36,668 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: master/192.168.86.133:9000. Already tried 9 time(s); retry policy is RetryUpToMa

很明显ｍａｓｔｅｒ节点９０００端口无法连接，没有关闭master防火墙

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安装好hadoop集群后，报错如下n org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /data/hadoop-roo

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