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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HADOOP-9562) Create REST interface for HDFS health data
Date Wed, 15 May 2013 08:31:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13658168#comment-13658168
] 

Suresh Srinivas edited comment on HADOOP-9562 at 5/15/13 8:29 AM:
------------------------------------------------------------------

{quote}
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.
{quote}

This is not correct. While doing standardized REST APIs may not be a bad idea, all of this
information is exposed in namnode webUI is exposed through {{FSNamesystemMBean}} and {{NameNodeMXBean}}
and the corresponding JMX http bridge (see HADOOP-7144 and related jiras). This is what currently
Ambari project uses.
                
      was (Author: sureshms):
    {quote}
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.
{quote}

This is not correct. While doing standardized REST APIs may not be a bad idea, all of this
information is exposed through {{FSNamesystemMBean}} and {{NameNodeMXBean}} and the corresponding
JMX http bridge (see HADOOP-7144 and related jiras). This is what currently Ambari project
uses.
                  
> Create REST interface for HDFS health data
> ------------------------------------------
>
>                 Key: HADOOP-9562
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9562
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs
>    Affects Versions: 2.0.4-alpha
>            Reporter: Trevor Lorimer
>            Priority: Minor
>
> 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 all the 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.

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