[HDFS-2887] Define a FSVolume interface

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.23.2
• Component/s: datanode
• Hadoop Flags: Incompatible change, Reviewed
• Release Note: FSVolume, is a part of FSDatasetInterface implementation, should not be referred outside FSDataset. A new FSVolumeInterface is defined. The BlockVolumeChoosingPolicy.chooseVolume(..) method signature is also updated.
• Assignee: Tsz-wo Sze
• Reporter: Tsz-wo Sze
• Created: 03/Feb/12 09:58
• Updated: 14/Aug/13 04:08
• Resolved: 08/Feb/12 21:08

Description

FSVolume is an inner class in FSDataset. It is actually a part of the implementation of FSDatasetInterface. It is better to define a new interface, namely FSVolumeInterface, to capture the abstraction.

Issue Links

• relates to: HDFS-1120 Make DataNode's block-to-device placement policy pluggable