我在 3 个 ubuntu 12.10 实例、1 个主服务器和 2 个从属服务器的亚马逊 ec2 上使用 hadoop-1.0.4，就在 ~ 目录下。现在 start-all.sh 和 stop-all.sh 没问题，但是当我在 master 或 slave 上运行 jps 时，它什么也没打印。然后我测试了hadoop示例：
~/hadoop$ bin/hadoop jar hadoop-examples-1.0.4.jar pi 10 10000
表明
Exception in thread "main" java.io.IOException: Permission denied
at java.io.UnixFileSystem.createFileExclusively(Native Method)
at java.io.File.createTempFile(File.java:1879)
at org.apache.hadoop.util.RunJar.main(RunJar.java:115)
但是我有 chmod 777 -R tmp 到 tmp 文件夹。
~/hadoop$ sudo bin/hadoop jar hadoop-examples-1.0.4.jar pi 10 10000
使用 sudo，它会产生
13/05/12 03:58:11 WARN conf.Configuration: DEPRECATED: hadoop-site.xml
found in the classpath. Usage of hadoop-site.xml is deprecated.
Instead use core-site.xml, mapred-site.xml and hdfs-site.xml to
override properties of core-default.xml, mapred-default.xml
and hdfs-default.xml respectively
Number of Maps = 10
Samples per Map = 10000
13/05/12 03:58:12 WARN fs.FileSystem: "54.235.101.85:50001" is a deprecated
filesystem name. Use "hdfs://54.235.101.85:50001/" instead.
13/05/12 03:58:13 INFO ipc.Client: Retrying connect to server:
hdmaster/54.235.101.85:50001. Already tried 0 time(s).
13/05/12 03:58:14 INFO ipc.Client: Retrying connect to server:
hdmaster/54.235.101.85:50001. Already tried 1 time(s).
13/05/12 03:58:15 INFO ipc.Client: Retrying connect to server:
hdmaster/54.235.101.85:50001. Already tried 2 time(s).
然后连接失败。那么问题是什么？我应该放 sudo 来运行示例吗？非常感谢。