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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3405) Checkpointing should use HTTP POST or PUT instead of GET-GET to send merged fsimages
Date Sat, 08 Mar 2014 12:24:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924817#comment-13924817
] 

Vinayakumar B commented on HDFS-3405:
-------------------------------------

I think, while merging the patch GetImageServlet.java was not renamed using svn command. 


> Checkpointing should use HTTP POST or PUT instead of GET-GET to send merged fsimages
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-3405
>                 URL: https://issues.apache.org/jira/browse/HDFS-3405
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 1.0.0, 3.0.0, 2.0.5-alpha
>            Reporter: Aaron T. Myers
>            Assignee: Vinayakumar B
>             Fix For: 3.0.0
>
>         Attachments: HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch,
HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch,
HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch, HDFS-3405.patch,
HDFS-3405.patch, HDFS-3405.patch
>
>
> As Todd points out in [this comment|https://issues.apache.org/jira/browse/HDFS-3404?focusedCommentId=13272986&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13272986],
the current scheme for a checkpointing daemon to upload a merged fsimage file to an NN is
to issue an HTTP get request to tell the target NN to issue another GET request back to the
checkpointing daemon to retrieve the merged fsimage file. There's no fundamental reason the
checkpointing daemon can't just use an HTTP POST or PUT to send back the merged fsimage file,
rather than the double-GET scheme.



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