启动namenode出现警告

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[root@hadoop128 hadoop-2.7.2]# sbin/hadoop-daemon.sh start namenode

starting namenode, logging to /opt/module/hadoop-2.7.2/logs/hadoop-root-namenode-hadoop128.out

Java HotSpot(TM) Client VM warning: You have loaded library /opt/module/hadoop-2.7.2/lib/native/libhadoop.so.1.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.

It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.

You have new mail in /var/spool/mail/root

解决办法：在 [root@hadoop128 hadoop-2.7.2]# vi /etc/profile

添加

export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native

export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"

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