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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3404) Make putImage in GetImageServlet infer remote address to fetch from
Date Fri, 11 May 2012 18:28:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13273489#comment-13273489
] 

Aaron T. Myers commented on HDFS-3404:
--------------------------------------

I just tested out this patch manually on a 2-node HA cluster and it worked as expected. Each
node is able to checkpoint to the other, even though each node has bound both its own RPC
and HTTP addresses 0.0.0.0. Each node need only have the RPC address of the other node set
to an actual address for everything to work properly.
                
> Make putImage in GetImageServlet infer remote address to fetch from
> -------------------------------------------------------------------
>
>                 Key: HDFS-3404
>                 URL: https://issues.apache.org/jira/browse/HDFS-3404
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-3404.patch, HDFS-3404.patch
>
>
> As it stands, daemons which perform checkpointing must determine their own address on
which they can be reached, so that the NN which they checkpoint against knows what address
to fetch a merged fsimage from. This causes problems if, for example, the daemon performing
checkpointing binds to 0.0.0.0, and thus can't be sure of what address the NN can reach it
at.

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