Erik Krogen created HADOOP-14136: ------------------------------------ Summary: Default FS For ViewFS Key: HADOOP-14136 URL: https://issues.apache.org/jira/browse/HADOOP-14136 Project: Hadoop Common Issue Type: Improvement Components: viewfs Reporter: Erik Krogen
It would be useful if ViewFS had the ability to designate one FileSystem as a "primary"/"default" to fall back to in the case that an entry in the mount table is not found. Consider the situation when you have a mount table that looks like: {code} /data -> hdfs://nn1/data /logs -> hdfs://nn1/logs /user -> hdfs://nn1/user /remote -> hdfs://nn2/remote {code} {{nn1}} here is being used as the primary, with a specific directory 'remote' being offloaded to another namenode. This works, but if we want to add another top-level directory to {{nn1}}, we have to update all of our client-side mount tables. Merge links (HADOOP-8298) could be used to achieve this but they do not seem to be coming soon; this special case of a default FS is much simpler - try to resolve through the VFS mount table, if not found, then resolve to the defaultFS. There is a good discussion of this at https://issues.apache.org/jira/browse/HADOOP-13055?focusedCommentId=15733822&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15733822 -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: common-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-dev-h...@hadoop.apache.org