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Your Hadoop cluster is accessed by Datameer X as a particular Hadoop user. By default, the user is identified as the UNIX user who launched the Datameer X application (equivalent to the UNIX command 'whoami'). To ensure this works properly, you should create a user of the same name within Hadoop's HDFS for Datameer X to use exclusively for scheduling and configuration. This ensures the proper permissions are set, and that this user is recognized whenever the Datameer X application interacts with your Hadoop cluster.

The username used to launch the Datameer X application can be configured in <Datameer X folder>/etc/das-env.sh

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Hadoop permissions can be set with the following commands. Note that permission checking can be enabled/disabled globally for HDFS. See Configuring Datameer X in a Shared Hadoop Cluster for more information.

hadoop -fs
      [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
      [-chown [-R] [OWNER][:[GROUP]] PATH...]
      [-chgrp [-R] GROUP PATH...]

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For standard Hadoop compression algorithms, you can choose the algorithm Datameer X should use. However, if your Hadoop cluster is using a non-standard compression algorithm such as LZO, you need to install these libraries onto the Datameer X machine. This is necessary so that Datameer X can read the files it writes to HDFS, and decompress files residing on HDFS which you wish to import. Libraries which utilize native compression require both a Java (JAR) and native code component (UNIX packages). The Java component is a JAR file that needs to be placed into <Datameer X folder>/etc/custom-jars. See Frequently Asked Hadoop Questions#Q. How do I configure Datameer/Hadoop to use native compression? for  for more details.

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