Java HDFS授予文件及其所有目录的权限
我在HDFS 2文件中有以下数据:Java HDFS授予文件及其所有目录的权限,java,scala,hadoop,hdfs,hadoop2,Java,Scala,Hadoop,Hdfs,Hadoop2,我在HDFS 2文件中有以下数据: /a /b /c /f1.txt /f2.txt 我想将f1.txt和f2.txt的权限更改为644: e、 g.hadoop fs-chmod 644/a/b/c/*.txt 但是,为了真正授予对这些文件的访问权限,我需要将/b和/c的权限更改为755:+x,以访问包含这些文件的目录。注意:我没有/a,这已经是世界可读的了 有没有一个hadoop fs命令可以让我这么做?Java/Scala代码如何?您可以使用ACL实现
/a
/b
/c
/f1.txt
/f2.txt
我想将f1.txt和f2.txt的权限更改为644:
e、 g.hadoop fs-chmod 644/a/b/c/*.txt
但是,为了真正授予对这些文件的访问权限,我需要将/b和/c的权限更改为755:+x,以访问包含这些文件的目录。注意:我没有/a,这已经是世界可读的了
有没有一个hadoop fs命令可以让我这么做?Java/Scala代码如何?您可以使用ACL实现:
为用户提供读写和执行访问权限
hdfs dfs -setfacl -m -R user:UserName:rwx /a/b/c/f1.txt
如果要查看文件的权限,请使用getfacl
hdfs dfs-getfacl-Rhdfs://somehost:8020/a/b/c/f1.txt
塞特法克尔
用法:hdfs dfs-setfacl[-R][-b |-k-m |-x][-set]
设置访问控制列表文件和目录的ACL
选项:
-b: Remove all but the base ACL entries. The entries for user, group and others are retained for compatibility with permission bits.
-k: Remove the default ACL.
-R: Apply operations to all files and directories recursively.
-m: Modify ACL. New entries are added to the ACL, and existing entries are retained.
-x: Remove specified ACL entries. Other ACL entries are retained.
--set: Fully replace the ACL, discarding all existing entries. The acl_spec must include entries for user, group, and others for compatibility with permission bits.
acl_spec: Comma separated list of ACL entries.
path: File or directory to modify.
示例:
hdfs dfs -setfacl -m user:hadoop:rw- /file
hdfs dfs -setfacl -x user:hadoop /file
hdfs dfs -setfacl -b /file
hdfs dfs -setfacl -k /dir
hdfs dfs -setfacl --set user::rw-,user:hadoop:rw-,group::r--,other::r-- /file
hdfs dfs -setfacl -R -m user:hadoop:r-x /dir
hdfs dfs -setfacl -m default:user:hadoop:r-x /dir
Exit Code:
Returns 0 on success and non-zero on error.
您可以为此使用ACL:
为用户提供读写和执行访问权限
hdfs dfs -setfacl -m -R user:UserName:rwx /a/b/c/f1.txt
如果要查看文件的权限,请使用getfacl
hdfs dfs-getfacl-Rhdfs://somehost:8020/a/b/c/f1.txt
塞特法克尔
用法:hdfs dfs-setfacl[-R][-b |-k-m |-x][-set]
设置访问控制列表文件和目录的ACL
选项:
-b: Remove all but the base ACL entries. The entries for user, group and others are retained for compatibility with permission bits.
-k: Remove the default ACL.
-R: Apply operations to all files and directories recursively.
-m: Modify ACL. New entries are added to the ACL, and existing entries are retained.
-x: Remove specified ACL entries. Other ACL entries are retained.
--set: Fully replace the ACL, discarding all existing entries. The acl_spec must include entries for user, group, and others for compatibility with permission bits.
acl_spec: Comma separated list of ACL entries.
path: File or directory to modify.
示例:
hdfs dfs -setfacl -m user:hadoop:rw- /file
hdfs dfs -setfacl -x user:hadoop /file
hdfs dfs -setfacl -b /file
hdfs dfs -setfacl -k /dir
hdfs dfs -setfacl --set user::rw-,user:hadoop:rw-,group::r--,other::r-- /file
hdfs dfs -setfacl -R -m user:hadoop:r-x /dir
hdfs dfs -setfacl -m default:user:hadoop:r-x /dir
Exit Code:
Returns 0 on success and non-zero on error.
使用-R递归选项。它为存在于目录中的所有文件授予权限
hadoop fs -chmod -R 755 /a/b/c/
使用-R递归选项。它为存在于目录中的所有文件授予权限
hadoop fs -chmod -R 755 /a/b/c/
这仅在HDFS中启用ACL时有效。dfs.namenode.acls.enabled默认为false。只有在HDFS中启用了ACL时,此选项才有效。dfs.namenode.acls.enabled默认值为false。