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Thursday, November 19, 2009

HDFS Permissions issues

If you are running into permissions issue in hdfs installation (Eg: When you try to write to hdfs and that does not seem to work ) - then you may want to *relax* the permissions by the following setting in all hdfs cluster nodes , in hdfs-site.xml ( starting from 0.20 ). Of course - the namednode needs to be restarted for the changes to be effective.

<property>
<name>dfs.permissions</name>
<value>false</value>
</property>


Important - this has a gaping security hole in itself by relaxing the permissions and currently the hdfs team is actively working on enabling better permission based access rules. So - this change is best in the early stages of development to get started and should be revisited once again soon after.



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