how to start hadoop in ubuntu

At the beginning of November, we learned about Ubuntu 12.04 's way of building a Hadoop cluster environment, and today we'll look at how Ubuntu12.04 builds Hadoop in a stand-alone environment. A. You want to install Ubuntu this step is omitted; Two. Create a Hadoop user grou

Cloudera VM 5.4.2 How to start Hadoop services1. Mounting position/usr/libhadoopsparkhbasehiveimpalamahout2. Start the first process init automatically, read Inittab->runlevel 5start the sixth step --init Process Execution Rc.sysinitAfter the operating level has been set, the Linux system performsfirst user-level fileIt is/etc/rc.d/rc.sysinitScripting, it does a

In the process of starting Hadoop distributed deployment, we found that Datanode did not start properly, and looked at the log to find the error:Java.io.IOException:Incompatible clusterids In/opt/hadoop-2.5/dfs/data:namenode Clusterid = cid-adf01a94-ae34-4313-acf9-3781a425de66; Datanode Clusterid = cid-e00fcbab-47c2-4e73-8a4b-c8754dc9960eThe reason is because Dat

Problem: When you start the Hadoop cluster, there's a nn that never comes up. Review the log and find the error as follows: 2016-05-04 15:12:27,837 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem:Get corrupt file blocks returned Error:operation category READ isn't supported in state standby 2016-05-04 15:12:36,124 INFO org.apache.hadoop.ipc.Server : IPC Server Handler 2 on 8020, call Org.apache.ha

For various reasons, we re-installed the hadoop cluster today, cleared the directory in/tmp, restarted the cluster, and started-all after hadoop namenode-format, but did not find the daemon process of datanode, I checked some information and found that it was heavy. After the namenode is reformatted, the IDs in current/version are different. Therefore, datanode cannot be started. Solution example: Chan

Org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize (fsnamesystem.java:311)At Org.apache.hadoop.hdfs.server.namenode.fsnamesystem.At Org.apache.hadoop.hdfs.server.namenode.NameNode.initialize (namenode.java:201)At Org.apache.hadoop.hdfs.server.namenode.namenode.At Org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode (namenode.java:956)At Org.apache.hadoop.hdfs.server.namenode.NameNode.main (namenode.java:965)2015-10-17 09:09:11,430 INFO Org.apache.hadoop.hdfs.server.namenod

1. Overview The following describes how NodeManager starts and registers various services. Mainly involved Java files Package org. apache. hadoop. yarn. server. resourcemanager under hadoop-yarn-server-resourcemanager: ResourcesManager. java 2. Code Analysis When Hadoop is started. The main of ResourcesManager is executed. 1). main Function Perform initia

-ant|grep 3306 Proto recv-q send-q Local address Foreign Address State PID/PR Ogram name TCP 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 1651/mysqldmeaning of the expressionThe default port for MySQL is 3306 open 0.0.0.0 represents your local network address after a connection for the external network address, there is a real IP address.Hadoop Start DebuggingOpen DEBUG Export hadoop_root_logger=debug,consoleLinux Packaging CommandsTar czvf my.tar.gz

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 Version of Namenode. If we format the Namenode freq

After the hadoop cluster is started, run the JPS command to view the process. Only the tasktracker process is found on the datanode node, as shown in. Master process:Two Slave node processes found that there was no datanode process on the salve node. after checking the log, we found that the data directory permission on datanode is 765, and the expected permission is 755. Therefore, we use the CHMOD 755 Data command, change the directory permission t

configuration replication factor, because it is now a pseudo-distribution, so there is only one DN, so it is 1.The second is mapred-site.xml. The Mapred.job.tracker is the location of the specified JT.Save exit. Then the Namenode is formatted, open the terminal, navigate to the Hadoop directory, enter the command: Hadoop Namenode-format Enter, see that the format is successful. If you add the bin directory

1. Installing Ubuntu 14.04 in VirtualBox 2. Installing Docker in Ubuntu 14.04 3. Installing Docker-based Hadoop Download image Docker Pull sequenceiq/hadoop-docker:2.6.0 Run container Docker Run-i-T Sequenceiq/hadoop