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启动start-all.sh时出现如下错误:

root@ubuntu:/home/chenwq/hadoop/hadoop-0.21.0/bin# start-all.shThis script is Deprecated. Instead use start-dfs.sh and start-mapred.shstarting namenode, logging to /home/chenwq/hadoop/hadoop-0.21.0/bin/../logs/hadoop-root-namenode-ubuntu.outlocalhost: Error: JAVA_HOME is not set.localhost: Error: JAVA_HOME is not set.starting jobtracker, logging to /home/chenwq/hadoop/hadoop-0.21.0/bin/../logs/hadoop-root-jobtracker-ubuntu.outlocalhost: Error: JAVA_HOME is not set.

解决办法:

    在hadoop-0.21.0/conf/文件夹里有个hadoop-env.sh的文件，它的作用是配置与hadoop运行环境相关的变量，

export JAVA_HOME=/usr/lib/jvm/java-6-sun

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