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https://issues.apache.org/jira/browse/HDFS-2083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052258#comment-13052258
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Suresh Srinivas commented on HDFS-2083:
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# Minor: Make this a staic string?
"/jmx?qry=Hadoop:service=NameNode,name=NameNodeInfo"
# Why do you need to create new string in readOutput() {{out.append(new
String(buffer, 0, len));}}
# Every time you need a property, you are querying mbean. Can you do it only
once and hold on to the response?
# NamenodeMXBeanHelper javadoc needs to be updated (It still talks about JMX,
also look at other references that talks about JMX access)
# Stream from URLConnection needs to be closed.
> Adopt JMXJsonServlet into HDFS in order to query statistics
> -----------------------------------------------------------
>
> Key: HDFS-2083
> URL: https://issues.apache.org/jira/browse/HDFS-2083
> Project: Hadoop HDFS
> Issue Type: New Feature
> Affects Versions: 0.23.0
> Reporter: Tanping Wang
> Assignee: Tanping Wang
> Fix For: 0.23.0
>
> Attachments: HDFS-2083.patch
>
>
> HADOOP-7144 added JMXJsonServlet into Common. It gives the capability to
> query statistics and metrics exposed via JMX to be queried through HTTP. We
> adopt this into HDFS. This provides the alternative solution to HDFS-1874.
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