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Message-ID: <20113602.151951288393522583.JavaMail.jira@thor>
Date: Fri, 29 Oct 2010 19:05:22 -0400 (EDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1457) Limit transmission rate when
 transfering image between primary and secondary NNs
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    [ https://issues.apache.org/jira/browse/HDFS-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926494#action_12926494 ] 

Hairong Kuang commented on HDFS-1457:
-------------------------------------

In DataXceiver, I already introduced a throttler for the purpose of balancer. Could we use Throttler to limit transmission rate 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
>             Fix For: 0.22.0
>
>         Attachments: checkpoint-limitandcompress.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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