Now let us have a look at HDFS usage commands and also commands used to get the metadata. hadoop fs -df – to get details about the amount of storage used by HDFS. Use -s to get summarized information and -h to get information in readable format. hadoop fs -du – to get the size …
Let us see how we can override properties while running commands such as hadoop fs. Let us first review properties files such as core-site.xml and hdfs-site.xml. We can override any non-final property using -Dproperty_name=property_value as part of hadoop fs command. We can also use options such as -fs to override Namenode URI We can also change replication …
https://gist.github.com/dgadiraju/fed51f71eb1eb9a086eaefc03b3cd577
ACLs stands for Access Control Lists and it gives finer level access control over files. Without ACLs permissions are controlled at owner, group and others levels only. To use ACLs in HDFS, we need to set dfs.namenode.acls.enabled to true as part of hdfs-site.xml. We can use hadoop fs -setfacl to set ACL at file or directory …
ACLs stands for Access Control Lists and it gives finer level access control over files. Without ACLs permissions are controlled at owner, group and others levels only. To use ACLs in HDFS, we need to set dfs.namenode.acls.enabled to true as part of hdfs-site.xml. We can use hadoop fs -setfacl to set ACL at file or directory …
Controlling Access using ACLs – Enable ACLs on Cluster Read More »
Let us go through file permissions in HDFS. As we create the files, we can check the permissions on them using -ls command. Typically the owner of the user space will have rwx, while members of the group specified as well as others have rx We can change the permissions using hadoop fs -chmod We can …
Managing files and file permissions – HDFS File permissions Read More »
