[HADOOP-11557] ViewFileSystem should init mount points lazily

• Type: Improvement
• Status: Patch Available
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.6.0
• Component/s: viewfs
• Labels: BB2015-05-TBR
• Target Version/s: 2.8.3
• Assignee: Gera Shegalov
• Reporter: Gera Shegalov
• Created: 07/Feb/15 00:41
• Updated: 11/Sep/17 05:21

Description

ViewFs initialization overhead can range from a couple to 10+ seconds linearly increasing with the number of mounted namespaces. Eager initialization is both expensive (especially when multiplied by MR tasks if viewfs is the defaultFS) and also provides for frustrating experience for users interactively working via FsShell with a single mount point (MP) under their user directory. Internal directories should not require MP initialization at all.