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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-6688) Hadoop JMX stats are not refreshed
Date Tue, 15 Jul 2014 23:45:11 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6688?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Wang resolved HDFS-6688.

    Resolution: Not a Problem

After discussion with Biju, we've decided that the stale nodes metric is satisfactory for
this usecase.

> Hadoop JMX stats are not refreshed
> ----------------------------------
>                 Key: HDFS-6688
>                 URL: https://issues.apache.org/jira/browse/HDFS-6688
>             Project: Hadoop HDFS
>          Issue Type: Bug
>         Environment: Ubuntu
>            Reporter: Biju Nair
> Even when the HDFS datanode process is stopped the JMX attribute Hadoop.NameNode.FSNamesystemState.NumLiveDataNodes/NumDeadDataNodes
attribute values doesn't change. Also Hadoop.NameNode.NameNodeInfo.Attributes.LiveNodes shows
the stopped datanode details. If these attributes reflect the actual changes in the datanode,
they can be used to monitor the health of the HDFS cluster which currently can't be used.

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