[HADOOP-13055] Implement linkMergeSlash and linkFallback for ViewFileSystem

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.5
• Fix Version/s: 3.1.0, 2.10.2
• Component/s: fs, viewfs
• Target Version/s: 3.0.0
• Assignee: Manoj Govindassamy
• Reporter: Zhe Zhang
• Created: 22/Apr/16 17:51
• Updated: 23/May/22 05:17
• Resolved: 14/Oct/17 19:19

Description

In a multi-cluster environment it is sometimes useful to operate on the root / slash directory of an HDFS cluster. E.g., list all top level directories. Quoting the comment in ViewFs:

 *   A special case of the merge mount is where mount table's root is merged
 *   with the root (slash) of another file system:
 *   <ul>
 *   <li>    fs.viewfs.mounttable.default.linkMergeSlash=hdfs://nn99/
 *   </ul>
 *   In this cases the root of the mount table is merged with the root of
 *            <b>hdfs://nn99/ </b> 

Issue Links

• is duplicated by: HADOOP-14136 Default FS For ViewFS
• relates to: HADOOP-14136 Default FS For ViewFS

Sub-Tasks

• Backport HADOOP-13055 into branch-2.10: Resolved