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https://issues.apache.org/jira/browse/MAPREDUCE-1222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12780966#action_12780966
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Hong Tang commented on MAPREDUCE-1222:
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bq. What happens if there is no hostname? i.e., the cluster is completely done
by IP address?
The attached patch assumes that task trackers advertise themselves by host
names. To avoid overly complicating the patch, I'd probably just add an option
to allow users to enable/disable node exclusion based on numeric ips.
> [Mumak] We should not include nodes with numeric ips in cluster topology.
> -------------------------------------------------------------------------
>
> Key: MAPREDUCE-1222
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1222
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/mumak
> Affects Versions: 0.21.0, 0.22.0
> Reporter: Hong Tang
> Assignee: Hong Tang
> Fix For: 0.21.0, 0.22.0
>
> Attachments: mapreduce-1222-20091119.patch
>
>
> Rumen infers cluster topology by parsing input split locations from job
> history logs. Due to HDFS-778, a cluster node may appear both as a numeric ip
> or as a host name in job history logs. We should exclude nodes appeared as
> numeric ips in cluster toplogy when we run mumak until a solution is found so
> that numeric ips would never appear in input split locations.
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