[HDFS-12292] Federation: Support viewfs:// schema path for DfsAdmin commands

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Component/s: federation
• Assignee: Mikhail Erofeev
• Reporter: Mikhail Erofeev
• Created: 11/Aug/17 11:39
• Updated: 16/Dec/17 05:35

Description

Motivation:
As of now, clients need to specify a nameservice when a cluster is federated, otherwise, the exception is fired:

hdfs dfsadmin -setQuota 10 viewfs://vfs-root/user/uname
setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system

# with fs.defaultFS = viewfs://vfs-root/
hdfs dfsadmin -setQuota 10 vfs-root/user/uname
setQuota: FileSystem viewfs://vfs-root/ is not an HDFS file system

# works fine thanks to https://issues.apache.org/jira/browse/HDFS-11432
hdfs dfsadmin -setQuota 10 hdfs://users-fs/user/uname

This creates inconvenience, inability to rely on fs.defaultFS and forces to create client-side mappings for management scripts

Implementation:
PathData that is passed to commands should be resolved to its actual FileSystem

Result:
ViewFS will be resolved to the actual HDFS file system

Issue Links

• relates to: HDFS-12929 There is error message when hdfs dfsadmin is run against a ViewFS config