hadoop namenode

JPS no Namenode after Hadoop startedGenerally due to two or more than two times the format of the Namenode, there are two ways to solve:1. Delete all data from Datanode2. Modify the Namespaceid of each datanode (located in the/home/hdfs/data/current/version file) or modify the Namespaceid of Namenode (located in/home/h

This article is partially transferred from Hadoop 2.0 NameNode HA and Federation practicesThis article is part of a tutorial on automatic ha+federation+yarn configuration in detail hadoop2 A Hadoop 20 HA implementation 1 uses shared storage to synchronize the edits information between two NN 2 Datanode hereinafter referred to as DN simultaneously to two NN report

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/*-RFSSH hd2 rm/home/

Own virtual machine on the establishment of a pseudo-distributed environment, the first day of all normal, and later found that every time after the reboot can not start normally, After start-dfs.sh JPS found Namenode can not start normally, follow the prompts to find the logs directory Namenode start log found the following exception.[email protected]:~$ JPS5096 ResourceManager5227 nodemanager5559 JPS 4742

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

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

The situation of manufacturing namenode downtime1) Kill the Namenode process [Email protected] bin]$ kill-9 13481 2) Delete the folder that Dfs.name.dir points to, here is /home/hadoop/hdfs/name. Current image In_use.lock Previous.checkpoint[[email protected] name]$ RM-RF * delete everything under the name directory, but you must ensure that the

Distributed File System HDFS-namenode architecture namenode Is the management node of the entire file system. It maintains the file directory tree of the entire file system [to make retrieval faster, this directory tree is stored in memory], The metadata of the file/directory and the data block list corresponding to each file. Receives user operation requests. Hadoop