[HDFS-5284] Flatten INode hierarchy

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.4.0
• Component/s: namenode
• Assignee: Jing Zhao
• Reporter: Tsz-wo Sze
• Created: 01/Oct/13 14:46
• Updated: 06/Jan/17 22:04

Description

Currently, we have a complicated inode hierarchy for representing different states of a file or a directory. For example, when a file is being created, it is represented by an INodeFileUnderConstruction. When a file is being closed, the inode is replaced by an INodeFile. If it is reopened for append, the inode is replaced again by an INodeFileUnderConstruction. This JIRA is to flatten the inode hierarchy. We may also improve the performance by eliminating the inode replacement in runtime.

Sub-Tasks

• Flatten INodeFile hierarchy: Add UnderContruction Feature: Closed
• Flatten INodeDirectory hierarchy: add DirectoryWithQuotaFeature: Closed
• Combine the getNsQuota() and getDsQuota() methods in INode: Closed
• Remove FileWithSnapshot interface: Closed
• Add Snapshot Feature to INodeFile: Closed
• Add Snapshot feature to INodeDirectory: Closed
• Merge INodeDirectory.Feature and INodeFile.Feature: Closed
• Use byte array to represent UnderConstruction feature and Snapshot feature for INodeFile: Open
• Use Snapshot ID to indicate the corresponding Snapshot for a FileDiff/DirectoryDiff: Closed
• Fix compilation error in AbstractINodeDiff for JDK7: Closed
• Use DirectorySnapshottableFeature to represent a snapshottable directory: Closed