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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7116) Add a metric to expose the bandwidth of balancer
Date Sat, 22 Aug 2015 10:45:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707978#comment-14707978
] 

Rakesh R commented on HDFS-7116:
--------------------------------

bq. How about adding a new dfsadmin command?
Thanks [~szetszwo] for the interest. We have initially discussed to support command or expose
the value through datanode report. Could you please see the attached patch 'HDFS-7116-01.patch'
, here I tried an attempt by exposing the value through datanode report. Later we've moved
to the metric approach due to the heartbeat overhead. Please see the [discussion|https://issues.apache.org/jira/browse/HDFS-7116?focusedCommentId=14696698&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14696698]
happened earlier in this jira.

> Add a metric to expose the bandwidth of balancer
> ------------------------------------------------
>
>                 Key: HDFS-7116
>                 URL: https://issues.apache.org/jira/browse/HDFS-7116
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: balancer & mover
>            Reporter: Akira AJISAKA
>            Assignee: Rakesh R
>         Attachments: HDFS-7116-00.patch, HDFS-7116-01.patch, HDFS-7116-02.patch, HDFS-7116-03.patch,
HDFS-7116-04.patch, HDFS-7116-05.patch
>
>
> Now reading logs is the only way to check how the balancer bandwidth is set. It would
be useful for administrators if they can get the value of the same. This jira to discuss &
implement the way to access the balancer bandwidth value of the datanode.



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