格式化 Hadoop 文件系统时出错

Question

我正在使用以下站点在 Ubuntu 10.10 中安装和配置 Hadoop http://arifn.web.id/blog/2010/07/29/running-hadoop-single-cluster.html

但是，当我尝试格式化 Hadoop 文件系统时，出现以下错误。

amathew@amathew-Dimension-3000:~$ cd /usr/local/hadoop
amathew@amathew-Dimension-3000:/usr/local/hadoop$ bin/hadoop namenode -format
11/04/16 21:23:07 INFO namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = amathew-Dimension-3000/192.168.1.66
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 0.20.2
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
11/04/16 21:23:08 INFO namenode.FSNamesystem: fsOwner=amathew,amathew,adm,dialout,cdrom,plugdev,lpadmin,admin,sambashare
11/04/16 21:23:08 INFO namenode.FSNamesystem: supergroup=supergroup
11/04/16 21:23:08 INFO namenode.FSNamesystem: isPermissionEnabled=true
11/04/16 21:23:08 ERROR namenode.NameNode: java.io.IOException: Cannot create directory /usr/local/hadoop-datastore/hadoop/dfs/name/current
    at org.apache.hadoop.hdfs.server.common.Storage$StorageDirectory.clearDirectory(Storage.java:295)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1086)
    at org.apache.hadoop.hdfs.server.namenode.FSImage.format(FSImage.java:1110)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:856)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:948)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)

11/04/16 21:23:08 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at amathew-Dimension-3000/192.168.1.66
************************************************************/

任何人都可以帮助处理这些错误消息，即ERROR namenode.NameNode: java.io.IOException: Cannot create directory /usr/local/hadoop-datastore/hadoop/dfs/name/current.

$ sudo mkdir /usr/local/hadoop/datastore
$ sudo chown  hadoop:hadoop /usr/local/hadoop/datastore
$ sudo chmod 750 /usr/local/hadoop/datastore

Answer 1

Hadoop 无法创建/usr/local/hadoop-datastore/hadoop/dfs/name/current目录。

尝试运行这个：

sudo bin/hadoop namenode -format

使用sudo.I运行 Hadoop 可执行文件。我不确定，但我认为当我安装 Hadoop 时它对我不起作用。如果是这样，请执行以下操作：

sudo su

然后：

bin/hadoop namenode -format