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From "Vinay (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3405) Checkpointing should use HTTP POST or PUT instead of GET-GET to send merged fsimages
Date Mon, 26 Aug 2013 08:45:53 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinay updated HDFS-3405:
------------------------

    Attachment: HDFS-3405.patch

Attaching the updated patch with
1. test failure fix.
2. exclusion commons-fileupload in hadoop-client
                
> 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: Vinay
>         Attachments: 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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