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https://issues.apache.org/jira/browse/HDFS-3405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13748262#comment-13748262
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Vinay commented on HDFS-3405:
-----------------------------

Thanks Jing for looking into patch.

I will post a updated patch soon.
{quote}Considering the patch will change the behavior of SNN and SBN, we may 
need to test the patch in clusters with HA/non-HA setup while security 
enabled/disabled? Could you do some test to verify difference scenarios? I will 
also test the patch in my local cluster these days{quote}
Yes, I had tested the patch in HA setup, with both kerberos security enabled 
and disabled. Need to test in Non-HA setup. I will do that also before posting 
next patch.
                
> 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
>
>
> 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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