启动Hadoop时报了一个警告信息,我安装的Hadoop版本是hadoop1.0.4,具体警告信息如下:
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[root@localhost hadoop-1.0.4]# ./bin/start-all.sh
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Warning: $HADOOP_HOME is deprecated.
网上的说法是因为Hadoop本身对HADOOP_HOME做了判断,具体在bin/hadoop和bin/hadoop-config.sh里。在hadoop-config.sh里有如下的配置:
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if [ "$HADOOP_HOME_WARN_SUPPRESS" = "" ] && [ "$HADOOP_HOME" != "" ]; then
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echo "Warning: \$HADOOP_HOME is deprecated." 1>&2
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echo 1>&2
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fi
对于这个警告问题,解决方法如下:
1.注释掉hadoop-config.sh里的上面给出的这段if fi配置(不推荐)
2.在/etc/profile里增加一个环境变量:
export HADOOP_HOME_WARN_SUPPRESS=1
注:修改完profile后需要执行source操作使其生效
备注:在ubuntu下应该是修改/home/.bashrc文件,增加一行 export HADOOP_HOME_WARN_SUPPRESS=1
执行完后我们可以检验一下配置是否成功,重新执行start-all.sh脚本:
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[root@localhost hadoop-1.0.4]# ./bin/start-all.sh
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starting namenode, logging to /root/hadoop-1.0.4/libexec/../logs/hadoop-root-namenode-localhost.out
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localhost: starting datanode, logging to /root/hadoop-1.0.4/libexec/../logs/hadoop-root-datanode-localhost.out
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localhost: starting secondarynamenode, logging to /root/hadoop-1.0.4/libexec/../logs/hadoop-root-secondarynamenode-localhost.out
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starting jobtracker, logging to /root/hadoop-1.0.4/libexec/../logs/hadoop-root-jobtracker-localhost.out
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localhost: starting tasktracker, logging to /root/hadoop-1.0.4/libexec/../logs/hadoop-root-tasktracker-localhost.out
没有出现Warning: $HADOOP_HOME is deprecated,说明问题已经解决。
(责任编辑:IT) |