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Posted to hdfs-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/10/01 01:57:32 UTC

[jira] Created: (HDFS-1435) Provide an option to store fsimage compressed

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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[jira] Resolved: (HDFS-1435) Provide an option to store fsimage compressed

Posted by "Hairong Kuang (JIRA)" <ji...@apache.org>.

     [ https://issues.apache.org/jira/browse/HDFS-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang resolved HDFS-1435.
---------------------------------

      Resolution: Fixed
    Release Note: This provides an option to store fsimage compressed. The layout version is bumped to -25. The user could configure if s/he wants the fsimage to be compressed or not and which codec to use. By default the fsimage is not compressed.
    Hadoop Flags: [Incompatible change, Reviewed]

I've committed this!

> 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
>
>         Attachments: checkpoint-limitandcompress.patch, trunkImageCompress.patch, trunkImageCompress1.patch, trunkImageCompress2.patch, trunkImageCompress3.patch, trunkImageCompress4.patch
>
>
> 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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