在点击 jps 命令时，Datanode 未显示

Question

我是 hadoop 的新手，我已经设置了多节点集群，但是当我在主节点上点击 jps 命令时，它只显示 namenode 而不是 datanode，当我粘贴此 url 'Master:50070' 时，它显示no live node，因此我无法将数据从我的本地系统复制到 hdfs 会引发此错误

hduser@oodles-Latitude-3540:~$ hadoop fs -copyFromLocal /home/oodles/input/test /tmp
15/06/28 16:27:56 WARN hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /tmp/test._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.
    at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1549)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3200)
    at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:641)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:482)
    at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
    at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619)
    at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:962)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2039)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2035)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:415)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2033)

使用此命令start-dfs.sh 启动hadoop 集群后，我的namenode 启动成功，但datanode 没有。当我检查数据节点日志时，它显示了这个

ToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-06-28 04:01:53,496 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master/192.168.0.126:9000. Already tried 6 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-06-28 04:01:54,498 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master/192.168.0.126:9000. Already tried 7 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-06-28 04:01:55,499 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master/192.168.0.126:9000. Already tried 8 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-06-28 04:01:56,500 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: Master/192.168.0.126:9000. Already tried 9 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

我用谷歌搜索但没有找到解决方案。

当我在从节点上点击 jps 命令时，它只显示数据节点

当我将“Master:50070”粘贴到浏览器并浏览文件系统时，还有一件事 它告诉我这个错误

HTTP ERROR 500

Problem accessing /nn_browsedfscontent.jsp. Reason:

    Can't browse the DFS since there are no live nodes available to redirect to.
Caused by:

java.io.IOException: Can't browse the DFS since there are no live nodes available to redirect to.
    at org.apache.hadoop.hdfs.server.namenode.NamenodeJspHelper.redirectToRandomDataNode(NamenodeJspHelper.java:666)
    at org.apache.hadoop.hdfs.server.namenode.nn_005fbrowsedfscontent_jsp._jspService(nn_005fbrowsedfscontent_jsp.java:70)

我的hadoop集群配置是这样的

1) 主机上的 /etc/host 文件

2) 从属设备上的 /etc/hosts 文件

我在 hadoop 配置文件夹的主和从文件中有编辑条目，即主文件我添加了主文件和从文件我添加了 Slave1

谁能帮我解决这些问题！

datanode 日志显示在两张图片中

Answer 1

你配置 ssh 吗？尝试使用 ssh 登录其他节点检查 ssh 连接。