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From "Charles Lamb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7331) Add Datanode network counts to datanode jmx page
Date Tue, 04 Nov 2014 00:43:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195470#comment-14195470
] 

Charles Lamb commented on HDFS-7331:
------------------------------------

Hi [~wheat9],

The current metric only exposes the total error count for all DNs that a DN is talking to.
This Jira adds per-DN error counts and leaves room in the JSON to add other items on a per-dn
basis. For example, if DN1 is talking to DN2, DN3, and DN4, this will allow an admin to see
the error count for each of DN2, DN3, and DN4 as seen from DN1. That will help the admin isolate
a network problem.

Charles


> Add Datanode network counts to datanode jmx page
> ------------------------------------------------
>
>                 Key: HDFS-7331
>                 URL: https://issues.apache.org/jira/browse/HDFS-7331
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Charles Lamb
>            Assignee: Charles Lamb
>            Priority: Minor
>         Attachments: HDFS-7331.001.patch
>
>
> Add per-datanode counts to the datanode jmx page. For example, networkErrors could be
exposed like this:
> {noformat}
>   }, {
> ...
>     "DatanodeNetworkCounts" : "{\"dn1\":{\"networkErrors\":1}}",
> ...
>     "NamenodeAddresses" : "{\"localhost\":\"BP-1103235125-127.0.0.1-1415057084497\"}",
>     "VolumeInfo" : "{\"/tmp/hadoop-cwl/dfs/data/current\":{\"freeSpace\":3092725760,\"usedSpace\":28672,\"reservedSpace\":0}}",
>     "ClusterId" : "CID-4b38f2ae-5e58-4e15-b3cf-3ba3f46e724e"
>   }, {
> {noformat}



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