我在linux上装单点hadoop，最后在./start-all.sh之后出现了一下代码，谁能解释一下，这是什么意思？_百度知道
我在linux上装单点hadoop，最后在./start-all.sh之后出现了一下代码，谁能解释一下，这是什么意思？
localhost: Unable to load native-hadoop library for your platform.;logs&#47.NativeCodeLoader:38 WARN util.: namenode running as process 6357.14&#47:24.0: starting datanode.0.4;hadoop-root-datanode-master. S14 11.;14 11;07&#47. Instead use start-dfs. Stop it first.0.0&#47: nodemanager running as process 6880.0This script is Deprecated. using builtin-java classes where applicablestarting yarn daemonsresourcemanager running as process 6777.NativeCodeLoader:25 WARNhadoop-2.localhost.outStarting secondary namenodes [0: Unable to load native-hadoop library for your platform.0. using builtin-java classes where applicableStarting namenodes on [localhost]localhost, logging to &#47.sh and start-yarn.sh14/07/home/hadoop&#47. Stop it first.hadoop:24. Stop it first: secondarynamenode running as process 6637..0]0
我有更好的答案
然后再执行start-all进程已经在运行中了，先执行stop-all.sh.sh下
你的hadoop进程已经运行了，需要你先关闭
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应该是杀掉所有nginx的进程...
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I have seen this question -- check if a process is running -- in a lot of forums and all seem a bit complex and unnecessary:
Checking if /proc/PID exists?
ps aux | grep -E &PID|name& ?
There is a simpler way of doing it: sending signal 0 (zero) to the process and letting the kernel tell if the process is running. So all you have to do is kill -0 PID or killall -0 name and check the return value of kill command using $?
kill -0 pid
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楼上讲的精辟~ 看来在linux的世界里达到目的的途径很多。真的是条条大路通罗马啊
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