[HDFS]FileSystem.copyToLocalFile下载文件报错Unable to load native-hadoop library for your platform..._the short-circuit local reads feature cannot be us

应用在服务器上启动后，从HDFS下载文件失败，报错如下：

Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
The short-circuit local reads feature cannot be used because libhadoop cannot be loaded.

第一句提示不能加载Hadoop的库，检查库，提示hadoop命令不存在：

$  hadoop checknative -a

-bash: hadoop: command not found

检查集群发现，开发的应用属于myapp用户，而hadoop应用属于myhadoop用户，故不能短路本地读取HDFS

参考：HDFS 本地短路读取 Short-Circuit Local Reads_风筝Lee的博客-CSDN博客

在hdfs-site.xml中，找到 dfs.block.local-path-access ，增加myapp用户

<property>
    <name>dfs.block.local-path-access.user</name>
    <value>myhadoop,myapp</value>
</property>

重启应用，错误没了。