namenode and datanode in hadoop

In general, live nodes is 0 because the Clusterid number in Namenode and Datanode is different because of repeated formatting. If you do not need to save the data, just redo it, you need the following steps.SSH hd1 rm/home/hadoop/namenode/*-RFSSH hd1 rm/home/hadoop/hdfs/*-RF

The author uses a virtual machine based on a distributed Hadoop installation, because the order of shutdown Datanode and Namenode is not appropriate, so often appear datanode loading failure. My solution is for the first time that the entire cluster has been successfully started, but the second failure due to an abnor

Java.io.DataInputStream.readInt (datainputstream.java:392)At Org.apache.hadoop.ipc.client$connection.receiveresponse (client.java:501)At Org.apache.hadoop.ipc.client$connection.run (client.java:446)Two. Why the problem occursWhen we perform file system formatting, a current/version file is saved in the Namenode Data folder (that is, in the configuration file Dfs.name.dir the path to the local system), the Namespaceid is recorded, the formatted Versio

What is meta-data? The explanation of the Baidu Encyclopedia is that the data describing the data, which is primarily descriptive of the data properties, is used to support functions such as indicating storage location, historical data, resource lookups, and file records. Metadata is an electronic catalogue, in order to achieve the purpose of compiling a directory, it is necessary to describe and collect the content or characteristics of the data, and then achieve the purpose of assisting the da

My workaround is for the first time that the entire cluster has been successfully started, but the second failure to start normally due to an unhealthy operation. There may be many reasons for the first startup failure: either due to misconfiguration of the configuration file or due to an SSH login configuration error without a password The author uses a virtual machine based Hadoop distributed installation, because the order of shutting down

bugs have surfaced. Then restart the computer. Is this because, check the TMP directory before restarting to determine the directory after several format namenode, after reboot, found all deleted. After executing the start-dfs.sh, I see that some directories are built under the TMP directory, but the Dfs/name directory still does not exist, and some directories and files were built in start-dfs.sh. and Dfs/name needs to be built when

1. HDFs machine Migration, implementation sbin/stop-dfs.sh Error: Dchadoop010.dx.momo.com:no Namenode to stopDchadoop009.dx.momo.com:no Namenode to stopDchadoop010.dx.momo.com:no Datanode to stopDchadoop009.dx.momo.com:no Datanode to stopDchadoop011.dx.momo.com:no Datanode t

Problem Description: When the node is changed in cluster mode, startup cluster Discovery Datanode has not been started up. I cluster configuration: There are 5 nodes, respectively, the master slave1-5. In master with Hadoop user execution: start-all.sh JPS to view the master node boot situation: NameNode Jobtracker Secondarynamenode Have been started normally, us

I. BACKGROUND The cloud trend in the second half of 2012 began to provide a large state-owned bank's historical transaction data backup and query technology solutions based on Hadoop, due to the industry's particularity, customer service availability has a very high demand, and HDFs has long been a problem with the point of trouble, until Apache Hadoop released its 2.0 alpha version in May 2012, where MRv2

For the first time, Hadoop was configured on the VM, and three virtual machines were created, one as namenode and jobtracker. The other two machines are used as datanode and tasktracker. After configuration, start the Cluster View cluster status through http: // localhost: 50700 No datanode found Check the node and fi

This question seems strange at first, when the native configuration starts Hadoop, first we need to format the Namenode, but after executing the command, the following exception appears: FATAL Namenode. Namenode:exception in NameNode join Java.lang.IllegalArgumentException:URI have an authority component. Whatever else

Hadoop cluster all datanode start unfavorable (solution), hadoopdatanode Datanode cannot be started only in the following situations. 1. First, modify the configuration file of the master, 2. Bad habits of hadoop namenode-format for multiple times. Generally, an error occurs

All datanode operations in the hadoop cluster are unfavorable (solution) Datanode cannot be started only in the following situations. 1. First, modify the configuration file of the master, 2. Bad habits of hadoop namenode-format for multiple times. Generally, an error occurs

Problem Description:When the node is changed in cluster mode, startup cluster Discovery Datanode has not been started up.I cluster configuration: There are 5 nodes, respectively, the master slave1-5.In master with Hadoop user execution: start-all.shJPS to view the master node boot situation:NameNodeJobtrackerSecondarynamenodeHave been started normally, using master:50070, Live Nodes is 0, with access to SLA

After the Hadoop environment is deployed, how can I solve the problem of running jps on the slave machine without seeing the Datanode process ?, Hadoopjps Problem description: After the Hadoop environment is deployed, you cannot see the Datanode process when running jps on the slave machine. Work und: delete all con

View SLAVER1/2 's logs and discoverFATAL Org.apache.hadoop.hdfs.server.datanode.DataNode:Initialization failed for block pool block pool Java.io.IOException:Incompatible clusterids In/usr/local/hadoop/hdfs/data:namenode Clusterid =Cid-af6f15aa-efdd-479b-bf55-77270058e4f7; Datanode Clusterid =Cid-736d1968-8fd1-4bc4-afef-5c72354c39ceAs can be seen from the log, the reason is because Datanode's Clusterid and N

Hadoop Problem Datanode Error (Error Org.apache.hadoop.hdfs.server.datanode.DataNode) Datanode Error 2010-06-25 11:40:12, 473 ERROR org. Apache. Hadoop. Hdfs. Server. Datanode. Datanode:Java. Io. Ioexception:incompatible namespaceids In/tmp/

Hadoop Problem Datanode Error (Error Org.apache.hadoop.hdfs.server.datanode.DataNode) DataNode Error 2010-06-25 11:40:12, 473 ERROR org. Apache. Hadoop. Hdfs. Server. Datanode. DataNode:Java. Io. Ioexception:incompatible namespaceids In/tmp/

This paper mainly analyzes the process of the Hadoop client read and write block. As well as client and Datanode communication protocols, data flow formats and so on. The Hadoop client communicates with the Namenode via the RPC protocol, but the client and the Datanode comm

$datanodeprotocolservice$2.callblockingmethod ( datanodeprotocolprotos.java:24079)At Org.apache.hadoop.ipc.protobufrpcengine$server$protobufrpcinvoker.call (protobufrpcengine.java:585)At Org.apache.hadoop.ipc.rpc$server.call (rpc.java:928)At Org.apache.hadoop.ipc.server$handler$1.run (server.java:2048)At Org.apache.hadoop.ipc.server$handler$1.run (server.java:2044)At java.security.AccessController.doPrivileged (Native Method)At Javax.security.auth.Subject.doAs (subject.java:415)At Org.apache.had