[HADOOP-9562] Create REST interface for HDFS health data

• Type: Improvement
• Status: Reopened
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 2.0.4-alpha, 3.0.0-alpha1
• Component/s: fs
• Labels: BB2015-05-TBR
• Assignee: Unassigned
• Reporter: Trevor Lorimer
• Created: 14/May/13 00:59
• Updated: 12/May/16 18:25

Description

The HDFS health screen (dfshealth.jsp) displays basic Version, Security and Health information concerning the NameNode, currently this information is accessible from classes in the org.apache.hadoop,hdfs.server.namenode package and cannot be accessed outside the NameNode. This becomes prevalent if the data is required to be displayed using a new user interface.

The proposal is to create a REST interface to expose the NameNode information displayed on dfshealth.jsp using GET methods. Wrapper classes will be created to serve the data to the REST root resource within the hadoop-hdfs project.

This will enable the HDFS health screen information to be accessed remotely.

Issue Links

• is blocked by: HDFS-4860 Add additional attributes to JMX beans
• relates to: HDFS-5004 Add additional JMX bean for NameNode status data