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https://issues.apache.org/jira/browse/HDFS-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13893814#comment-13893814
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Haohui Mai commented on HDFS-3405:
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The current implementation requires that all HTTP connections have to be
created through {{URLConnectionFactory}}. I'm not sure whether the library
obeys this requirement. It also makes deployment more difficult.
It seems to me that WebHDFS needs to handle the exact same problem. You might
want to check whether there is an easier path for this.
> 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, 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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