#java.library.path

Hadoop 2.4 버전을 받아 압축을 풀고 설정 파일 내용을 채운 후에 시작하려 했으나 아래와 같은 오류 메시지를 출력하면서 더 이상 진행이 되지 않았다.

/opt/hadoop$ sbin/start-all.sh This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh 14/06/17 02:04:21 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Starting namenodes on [OpenJDK 64-Bit Server VM warning: You have loaded library /opt/hadoop-2.4.0/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'. localhost] sed: -e expression #1, char 6: unknown option to `s' 64-Bit: ssh: Could not resolve hostname 64-Bit: Name or service not known OpenJDK: ssh: Could not resolve hostname OpenJDK: Name or service not known warning:: ssh: Could not resolve hostname warning:: Name or service not known have: ssh: Could not resolve hostname have: Name or service not known You: ssh: Could not resolve hostname You: Name or service not known guard.: ssh: Could not resolve hostname guard.: Name or service not known will: ssh: Could not resolve hostname will: Name or service not known try: ssh: Could not resolve hostname try: Name or service not known VM: ssh: Could not resolve hostname VM: Name or service not known have: ssh: Could not resolve hostname have: Name or service not known stack: ssh: Could not resolve hostname stack: Name or service not known might: ssh: Could not resolve hostname might: Name or service not known disabled: ssh: Could not resolve hostname disabled: Name or service not known highly: ssh: Could not resolve hostname highly: Name or service not known the: ssh: Could not resolve hostname the: Name or service not known loaded: ssh: Could not resolve hostname loaded: Name or service not known which: ssh: Could not resolve hostname which: Name or service not known library: ssh: Could not resolve hostname library: Name or service not known ....

Stack Overflow 에서 위 문제에 대한 질문과 답을 찾았다.

http://stackoverflow.com/questions/20144371/hadoop-2-2-0-setup-pseudo-distributed-mode-error-warn-util-nativecodeloader?rq=1

해결 방법은 hadoop-env.sh 파일에 아래 두 줄을 추가하면 된다.