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https://issues.apache.org/jira/browse/HADOOP-3620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612439#action_12612439
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Devaraj Das commented on HADOOP-3620:
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As far as I can see, the resolution happens with the global FSNamesystem lock
held. Is that true? Dhruba had a concern there and I don't see a nice way to
handle that either. The patch looks good otherwise (subject to hudson passing
it and successfully running MapReduce jobs with this patch).
> Namenode should synchronously resolve a datanode's network location when the
> datanode registers
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-3620
> URL: https://issues.apache.org/jira/browse/HADOOP-3620
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.18.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.19.0
>
> Attachments: netResolution.patch, netResolution1.patch,
> netResolution2.patch, netResolution3.patch
>
>
> Release 0.18.0 removes the rpc timeout. So the namenode is ok to resolve a
> datanode's network location when the datanode registers. This could remove
> quite a lot of unnecessary code in both datanode and namenode to handle
> asynchronous network location resolution and avoid many potential bugs.
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