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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1457) Limit transmission rate when transfering image between primary and secondary NNs
Date Tue, 02 Nov 2010 02:55:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12927265#action_12927265

Hairong Kuang commented on HDFS-1457:

Right, the support for compressed image has already checked in in HDFS-1435. So I expect that
a user with a big image runs NN with image compression enabled, which in addition will reduce
the cost of saving the image to local or remote disks at NN.

Then this jira simply supports image transfer throttling. Does this make sense? I am glad
to hear that Baidu is running Hadoop well. You guys have done good job with Hadoop.

> 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
> 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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