hadoop学习——第二天

继续昨天问题:今天已经解决,调通了（hadoop 1.0.0）

 

• 问题

2012-03-13 20:12:57,764 ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed.

 

原因是没有fomat namenode 执行如下命令

 

•  bin/hadoop namenode -format

 

在这之前需要检查：是否有hadoop进程没有关闭

• ps -aux|grep "hadoop"

 检查是否有hadoop运行

• bin/start-all.sh

运行结果

输入

• 查看NameNode结果

  http://IP地址:50070/ 或者http://localhost:50070/

NameNode 'localhost:9000'

Started:	Wed Mar 14 18:48:41 CST 2012
Version:	1.0.1-SNAPSHOT, r
Compiled:	Wed Dec 28 11:13:26 CST 2011 by somo
Upgrades:	There are no upgrades in progress.

Browse the filesystem
Namenode Logs

---

Cluster Summary

Safe mode is ON. The ratio of reported blocks 0.0000 has not reached the threshold 0.9990. Safe mode will be turned off automatically.
6 files and directories, 1 blocks = 7 total. Heap Size is 240.69 MB / 888.94 MB (27%)

Configured Capacity	:	0 KB
DFS Used	:	0 KB
Non DFS Used	:	0 KB
DFS Remaining	:	0 KB
DFS Used%	:	100 %
DFS Remaining%	:	0 %
Live Nodes	:	0
Dead Nodes	:	0
Decommissioning Nodes	:	0
Number of Under-Replicated Blocks	:	0

There are no datanodes in the cluster

---

NameNode Storage:

Storage Directory	Type	State
/tmp/hadoop-somo/dfs/name	IMAGE_AND_EDITS	Active

 

---

This is Apache Hadoop release 1.0.1-SNAPSHOT

 

 

查看JobTracker

 http://localhost:50030/

 

上面页面显示，成功，不过集群没有Data Node