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Date: Thu, 7 Oct 2010 03:06:34 -0400 (EDT)
From: "Jeff Hammerbacher (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1435) Provide an option to store fsimage
 compressed
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    [ https://issues.apache.org/jira/browse/HDFS-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12918800#action_12918800 ] 

Jeff Hammerbacher commented on HDFS-1435:
-----------------------------------------

bq. Jeff, I'd like to take a look at the Avro file format. Do you know if Avro file format has any overhead than the current fsimage format?

I don't know about the current fsimage format. The Avro format, however, is detailed in the Avro spec: http://avro.apache.org/docs/current/spec.html#Object+Container+Files

> Provide an option to store fsimage compressed
> ---------------------------------------------
>
>                 Key: HDFS-1435
>                 URL: https://issues.apache.org/jira/browse/HDFS-1435
>             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
>
>
> Our HDFS has fsimage as big as 20G bytes. It consumes a lot of network bandwidth when secondary NN uploads a new fsimage to primary NN.
> If we could store fsimage compressed, the problem could be greatly alleviated.
> I plan to provide a new configuration hdfs.image.compressed with a default value of false. If it is set to be true, fsimage is stored as compressed.
> The fsimage will have a new layout with a new field "compressed" in its header, indicating if the namespace is stored compressed or not.

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