[HDFS-5324] Make Namespace implementation pluggable in the namenode

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.1.1-beta
• Component/s: namenode

Environment

All

• Hadoop Flags: Incompatible change
• Assignee: Milind Barve
• Reporter: Milind Barve
• Due: 08/Nov/13
• Created: 08/Oct/13 17:12
• Updated: 09/Feb/15 21:31

Description

For the last couple of months, we have been working on making Namespace
implementation in the namenode pluggable. We have demonstrated that it can
be done without major surgery on the namenode, and does not have noticeable
performance impact. We would like to contribute it back to Apache HDFS.

Issue Links

• is related to: HDFS-5389 A Namenode that keeps only a part of the namespace in memory
• requires: HDFS-5453 Support fine grain locking in FSNamesystem