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From "Lu Yilei (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1457) Limit transmission rate when transfering image between primary and secondary NNs
Date Fri, 15 Oct 2010 02:07:33 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lu Yilei updated HDFS-1457:
---------------------------

    Attachment: 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

LZO compression codec is not supported in Hadoop standard package. So default copression is
GzipCodec.

> 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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