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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1457) Limit transmission rate when transfering image between primary and secondary NNs
Date Thu, 04 Nov 2010 06:45:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928141#action_12928141
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Konstantin Shvachko commented on HDFS-1457:
-------------------------------------------

Looks like {{imageTransferThrottler}} is instantiated but not used in {{FSImage}}. Should
it be moved into {{GetImageServlet}} instead?

> Limit transmission rate when transfering image between primary and secondary NNs
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1457
>                 URL: https://issues.apache.org/jira/browse/HDFS-1457
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>         Attachments: checkpoint-limitandcompress.patch, trunkThrottleImage.patch, trunkThrottleImage1.patch
>
>
> If the fsimage is very big. The network is full in a short time when SeconaryNamenode
do checkpoint, leading to Jobtracker access Namenode to get relevant file data to fail in
job initialization phase. So we limit transmission speed and compress transmission to resolve
the problem. 

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