[jira] [Resolved] (HDFS-4071) Add number of stale DataNodes to metrics for Branch-1

["Suresh Srinivas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Srinivas resolved HDFS-4071.
-----------------------------------

          Resolution: Fixed
       Fix Version/s: 1.2.0
    Target Version/s: 1.1.1, 2.0.3-alpha  (was: 1.1.1, 3.0.0, 2.0.3-alpha)
        Release Note: 
This jira adds a new metric with name "StaleDataNodes" under metrics context "dfs" of type Gauge. This tracks the number of DataNodes marked as stale. A DataNode is marked stale when the heartbeat message from the DataNode is not received within the configured time ""dfs.namenode.stale.datanode.interval". 


Please see hdfs-default.xml documentation corresponding to "dfs.namenode.stale.datanode.interval" for more details on how to configure this feature. When this feature is not configured, this metrics would return zero. 
        Hadoop Flags: Reviewed

I committed the patch to branch-1. Thank you Jing.
                
> Add number of stale DataNodes to metrics for Branch-1
> -----------------------------------------------------
>
>                 Key: HDFS-4071
>                 URL: https://issues.apache.org/jira/browse/HDFS-4071
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, name-node
>    Affects Versions: 1.2.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>            Priority: Minor
>             Fix For: 1.2.0
>
>         Attachments: HDFS-4059-backport-branch-1.001.patch
>
>
> Backport HDFS-4059 to branch-1.

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