hadoop start hdfs

ObjectiveThe purpose of this document is to help you quickly complete Hadoop installation and use on a single machine so you can experience the Hadoop Distributed File System (HDFS) and map-reduce frameworks, such as running sample programs or simple jobs on HDFS.Prerequisites Support Platform Gnu/linux is a platform for product development and operation

Start using Hadoop and hive to analyze mobile phone usage in hdinsightin order to get you started quickly using Hdinsight, this tutorial will show you how to run a query hive extracted from a Hadoop cluster, from unstructured data to meaningful information. Then, you will analyze the results in Microsoft Excel. Attention:If you are new to

Questions Guide:1. How do I start looking at problems when Hadoop is having problems?2, Datanode can not start, how should we solve?3. How to add Datanode or Tasktracker dynamically?First, the problem descriptionWhen I format the file system many times, such as[Email protected]:/usr/local/hadoop-1.0. 2# Bin/

needs to be started separately, it's worth the time to stop alone 4. on [nn1], format it, and start: bin/hdfs namenode-start namenode5. On [NN2], Synchronize nn1 metadata information: bin/hdfs Namenode-bootstrapstandby 6. start [nn2]:sbin/

Hadoop datanode cannot be started From: http://book.51cto.com/art/201110/298602.htm If you encounter problems during the installation, or you cannot run hadoop after the installation is complete, we recommend that you carefully check the log information, and hadoop records the detailed log information, log files are saved in the logs folder.

the reason is that the Namespaceid in the Datanode version file of Hadoop is inconsistent with the Namespaceid in the version file in Namenode. The author of Namespaceid's generation infers that it should be generated at the time of execution: HDFs namenode-format this command. The steps to resolve are as follows: 1, first stop the related process on Namenode: switch to the/sbin directory of

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

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 abnormal operation has not started properly. The first startup failure may have many causes: either due to a configuration file error write

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, using master:50070, Live Nodes is 0, with acces

three ways to start and close Hadoop's five daemon processes The first type of startup: Go to "hadoop-1.x/bin" directory, perform START-ALL.SH,JPS view process, start all successfully. 19043 NameNode 19156 DataNode 19271SecondaryNameNode 19479TaskTracker 24008 Jps 19353JobTracker View

Reason: In the original computer Configuration pseudo-distribution, has been hostname and IP bindings, so when copied to another computer, when the restart will fail, because the new computer IP is not the same as the original computer IP! Because in a different network, in NAT mode, the IP of Linux is definitely located in different network segments!!Solution: Vi/etc/hosts The original computer's IP to the new computer's IP.Also: When reformatting Hadoop