[HDFS-8487] Generalize BlockInfo in preparation of merging HDFS-7285 into trunk and branch-2

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: namenode
• Target Version/s: 2.8.0
• Hadoop Flags: Reviewed
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 27/May/15 19:26
• Updated: 30/Aug/16 01:33
• Resolved: 12/Jun/15 18:48

Description

Per offline discussion with andrew.wang, for easier and cleaner reviewing, we should probably shrink the size of the consolidated HDFS-7285 patch by merging some mechanical changes that are unrelated to EC-specific logic to trunk first. Those include renaming, subclassing, interfaces, and so forth. This umbrella JIRA specifically aims to merge code changes around BlockInfo and BlockInfoContiguous back into trunk.

The structure of BlockInfo -related classes are shown below:

                BlockInfo (abstract)
               /         \
BlockInfoStriped          BlockInfoContiguous
       |                        |
       |       BlockInfoUC      |
       |       (interface)      |
       |       /         \      |
BlockInfoStripedUC       BlockInfoContiguousUC

Sub-Tasks

• Rename BlockInfoContiguous to BlockInfo: Resolved
• Subclass BlockInfo to represent contiguous blocks: Resolved
• Subclass BlockInfo to represent contiguous blocks: Resolved
• Refactor BlockInfo class hierarchy with static helper class: Resolved